Patent Grant
8138337
1. Field of the Invention
The present invention relates generally to reverse-turn mimetic structures and to a chemical library relating thereto. The invention also relates to applications in the treatment of medical conditions, e.g., cancer diseases, and pharmaceutical compositions comprising the mimetics.
2. Description of the Related Art
Random screening of molecules for possible activity as therapeutic agents has occurred for many years and resulted in a number of important drug discoveries. While advances in molecular biology and computational chemistry have led to increased interest in what has been termed “rational drug design”, such techniques have not proven as fast or reliable as initially predicted. Thus, in recent years there has been a renewed interest and return to random drug screening. To this end, particular strides having been made in new technologies based on the development of combinatorial chemistry libraries, and the screening of such libraries in search for biologically active members.
In general, combinatorial chemistry libraries are simply a collection of molecules. Such libraries vary by the chemical species within the library, as well as the methods employed to both generate the library members and identify which members interact with biological targets of interest. While this field is still young, methods for generating and screening libraries have already become quite diverse and sophisticated. For example, a recent review of various combinatorial chemical libraries has identified a number of such techniques (Dolle, J. Com. Chem., 2(3): 383-433, 2000), including the use of both tagged and untagged library members (Janda, Proc. Natl. Acad. Sci. USA 91:10779-10785, 1994).
Initially, combinatorial chemistry libraries were generally limited to members of peptide or nucleotide origin. To this end, the techniques of Houghten et al. illustrate an example of what is termed a “dual-defined iterative” method to assemble soluble combinatorial peptide libraries via split synthesis techniques (Nature (London) 354:84-86, 1991; Biotechniques 13:412-421, 1992; Bioorg. Med. Chem. Lett. 3:405-412, 1993). By this technique, soluble peptide libraries containing tens of millions of members have been obtained. Such libraries have been shown to be effective in the identification of opioid peptides, such as methionine- and leucine-enkephalin (Dooley and Houghten, Life Sci. 52, 1509-1517, 1993), and a N-acylated peptide library has been used to identify acetalins, which are potent opioid antagonists (Dooley et al., Proc. Natl. Acad. Sci. USA 90:10811-10815, 1993. More recently, an all D-amino acid opioid peptide library has been constructed and screened for analgesic activity against the mu (“μ”) opioid receptor (Dooley et al, Science 266:2019-2022, 1994).
While combinatorial libraries containing members of peptide and nucleotide origin are of significant value, there is still a need in the art for libraries containing members of different origin. For example, traditional peptide libraries to a large extent merely vary the amino acid sequence to generate library members. While it is well recognized that the secondary structures of peptides are important to biological activity, such peptide libraries do not impart a constrained secondary structure to its library members.
To this end, some researchers have cyclized peptides with disulfide bridges in an attempt to provide a more constrained secondary structure (Tumelty et al., J. Chem. Soc. 1067-68, 1994; Eichler et al., Peptide Res. 7:300-306, 1994). However, such cyclized peptides are generally still quite flexible and are poorly bioavailable, and thus have met with only limited success.
More recently, non-peptide compounds have been developed which more closely mimic the secondary structure of reverse-turns found in biologically active proteins or peptides. For example, U.S. Pat. No. 5,440,013 to Kahn and published PCT Applications Nos. WO94/03494, WO01/00210A1, and WO01/16135A2 to Kahn each disclose conformationally constrained, non-peptidic compounds, which mimic the three-dimensional structure of reverse-turns. In addition, U.S. Pat. No. 5,929,237 and its continuation-in-part U.S. Pat. No. 6,013,458, both to Kahn, disclose conformationally constrained compounds which mimic the secondary structure of reverse-turn regions of biologically active peptides and proteins. The synthesis and identification of conformationally constrained, reverse-turn mimetics and their application to diseases were well reviewed by Obrecht (Advances in Med. Chem., 4, 1-68, 1999).
While significant advances have been made in the synthesis and identification of conformationally constrained, reverse-turn mimetics, there remains a need in the art for small molecules which mimic the secondary structure of peptides. There is also a need in the art for libraries containing such members, as well as techniques for synthesizing and screening the library members against targets of interest, particularly biological targets, to identify bioactive library members.
The present invention also fulfills these needs, and provides further related advantages by providing conformationally constrained compounds which mimic the secondary structure of reverse-turn regions of biologically active peptides and proteins.
Wnt signaling pathway regulates a variety of processes including cell growth, oncogenesis, and development (Moon et al., 1997, Trends Genet. 13, 157-162; Miller et al., 1999, Oncogene 18, 7860-7872; Nusse and Varmus, 1992, Cell 69, 1073-1087; Cadigan and Nusse, 1997, Genes Dev. 11, 3286-3305; Peifer and Polakis, 2000 Science 287, 1606-1609; Polakis 2000, Genes Dev. 14, 1837-1851). Wnt signaling pathway has been intensely studied in a variety of organisms. The activation of TCF4/β-catenin mediated transcription by Wnt signal transduction has been found to play a key role in its biological functions (Molenaar et al., 1996, Cell 86:391-399; Gat et al., 1998 Cell 95:605-614; Orford et al., 1999 J. Cell. Biol. 146:855-868; Bienz and Clevers, 2000, Cell 103:311-20).
In the absence of Wnt signals, tumor suppressor gene adenomatous polyposis coli (APC) simultaneously interacts with the serine kinase glycogen synthase kinase (GSK)-3β and β-catenin (Su et al., 1993, Science 262, 1734-1737: Yost et al., 1996 Genes Dev. 10, 1443-1454: Hayashi et al., 1997, Proc. Natl. Acad. Sci. USA, 94, 242-247: Sakanaka et al., 1998, Proc. Natl. Acad. Sci. USA, 95, 3020-3023: Sakanaka and William, 1999, J. Biol. Chem. 274, 14090-14093). Phosphorylation of APC by GSK-3β regulates the interaction of APC with β-catenin, which in turn may regulate the signaling function of β-catenin (B. Rubinfeld et al., Science 272, 1023, 1996). Wnt signaling stabilizes β-catenin allowing its translocation to the nucleus where it interacts with members of the lymphoid enhancer factor (LEF1)/T-cell factor (TCF4) family of transcription factors (Behrens et al., 1996 Nature 382, 638-642; Hsu et al., 1998, Mol. Cell. Biol. 18, 4807-4818; Roose et al., 1999 Science 285, 1923-1926).
Recently c-myc, a known oncogene, was shown to be a target gene for β-catenin/TCF4-mediated transcription (He et al., 1998 Science 281 1509-1512; Kolligs et al., 1999 Mol. Cell. Biol. 19, 5696-5706). Many other important genes, including cyclin D1, and metalloproteinase, which are also involved in oncogenesis, have been identified to be regulated by TCF4/beta-catenin transcriptional pathway (Crawford et al., 1999, Oncogene 18, 2883-2891; Shtutman et al., 1999, Proc. Natl. Acad. Sci. USA., 11, 5522-5527; Tetsu and McCormick, 1999 Nature, 398, 422-426).
Moreover, overexpression of several downstream mediators of Wnt signaling has been found to regulate apoptosis (Moris et al., 1996, Proc. Natl. Acad. Sci. USA, 93, 7950-7954; He et al., 1999, Cell 99, 335-345: Orford et al, 1999 J. Cell. Biol., 146, 855-868; Strovel and Sussman, 1999, Exp. Cell. Res., 253, 637-648). Overexpression of APC in human colorectal cancer cells induced apoptosis (Moris et al., 1996, Proc. Natl. Acad. Sci. USA. 93, 7950-7954), ectopic expression of β-catenin inhibited apoptosis associated with loss of attachment to extracellular matrix (Orford et al, 1999, J. Cell Biol. 146, 855-868). Inhibition of TCF4/β-catenin transcription by expression of dominant-negative mutant of TCF4 blocked Wnt-1-mediated cell survival and rendered cells sensitive to apoptotic stimuli such as anti-cancer agent (Shaoqiong Chen et al., 2001, J. Cell. Biol., 152, 1, 87-96) and APC mutation inhibits apoptosis by allowing constitutive survivin expression, a well-known anti-apoptotic protein (Tao Zhang et al., 2001, Cancer Research, 62, 8664-8667).
Although mutations in the Wnt gene have not been found in human cancer, a mutation in APC or β-catenin, as is the case in the majority of colorectal tumors, results in inappropriate activation of TCF4, overexpression of c-myc and production of neoplastic growth (Bubinfeld et al, 1997, Science, 275, 1790-1792; Morin et al, 1997, Science, 275, 1787-1790; Casa et al, 1999, Cell. Growth. Differ. 10, 369-376). The tumor suppressor gene (APC) is lost or inactivated in 85% of colorectal cancers and in a variety of other cancers as well (Kinzler and Vogelstein, 1996, Cell 87, 159-170). APC's principal role is that of a negative regulator of the Wnt signal transduction cascade. A center feature of this pathway involves the modulation of the stability and localization of a cytosolic pool of β-catenin by interaction with a large Axin-based complex that includes APC. This interaction results in phosphorylation of β-catenin thereby targeting it for degradation.
CREB binding proteins (CBP)/p300 were identified initially in protein interaction assays, first through its association with the transcription factor CREB (Chrivia et al, 1993, Nature, 365, 855-859) and later through its interaction with the adenoviral-transforming protein E1A (Stein et al., 1990, J. Viol., 64, 4421-4427; Eckner et al., 1994, Genes. Dev., 8, 869-884). CBP had a potential to participate in variety of cellular functions including transcriptional coactivator function (Shikama et al., 1997, Trends. Cell. Biol., 7, 230-236; Janknecht and Hunter, 1996, Nature, 383, 22-23). CBP/p300 potentiates β-catenin-mediated activation of the siamois promoter, a known Wnt target (Hecht et al, 2000, EMBO J. 19, 8, 1839-1850). β-catenin interacts directly with the CREB-binding domain of CBP and β-catenin synergizes with CBP to stimulate the transcriptional activation of TCF4/β-catenin (Ken-Ichi Takemaru and Randall T. Moon, 2000 J. Cell. Biol., 149, 2, 249-254).
From this background, it is seen that TCF4/β-catenin and CBP complex of Wnt pathway can be taken as target molecules for the regulation of cell growth, oncogenesis and apoptosis of cells, etc. Accordingly, the present invention addresses a need for compounds that block TCF4/β-catenin transcriptional pathway by inhibiting CBP, and therefore can be used for treatment of cancer, especially colorectal cancer.
In brief, the present invention is directed to a new type of conformationally constrained compounds, which mimic the secondary structure of reverse-turn regions of biologically active peptides and proteins. This invention also discloses libraries containing such compounds, as well as the synthesis and screening thereof.
The compounds of the present invention have the following general formula (I):
wherein A is —(CHR3)— or —(C═O)—, B is —(CHR4)— or —(C═O)—, D is —(CHR5)— or —(C═O)—, E is —(ZR6)— or —(C═O)—, G is —(XR7)n—, —(CHR7)—(NR8)—, —(C═O)—(XR9)—, or —(C═O)—, W is —Y(C═O)—, —(C═O)NH—, —(SO2)— or is absent, Y is oxygen, sulfur, or —NH—, X and Z is independently nitrogen or CH, n=0 or 1; and R1, R2, R3, R4, R5, R6, R7, R8 and R9 are the same or different and independently selected from an amino acid side chain moiety or derivative thereof, the remainder of the molecule, a linker and a solid support, and stereoisomers thereof.
In an embodiment wherein A is —(CHR3)— or —(C═O)—; B is —(CHR4)— or —(C═O)—; D is —(CHR5)— or —(C═O)—; E is —ZR6— or —(C═O)—, wherein Z is CH or N; G is —XR7— or —(C═O)—, wherein X is CH or N; W is —(C═O)NH—, —(C═O)O—, —(C═O)S—, —S(O)2— or nothing; and each of R1, R2, R3, R4, R5, R6 and R7 is the same or different and independently an amino acid side chain moiety or an amino acid side chain derivative, the compounds of this invention have the following formula (IA):
Specific examples of R1, R2, R3, R4, R5, R6 and R7 are provided in the following detailed description.
In an embodiment wherein A is —(CHR3)—, B is —(C═O)—, D is —(CHR5)—, E is —(C═O)—, and G is —(XR7)n—, the compounds of this invention have the following formula (II):
wherein W, X, Y and n are as defined above, and R1, R2, R3, R5 and R7 are as defined in the following detailed description.
In an embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —(ZR6)—, and G is —(C═O)—(XR9)—, the compounds of this invention have the following formula (III):
wherein W, X and Y are as defined above, Z is nitrogen or CH (with the proviso that when Z is CH, then X is nitrogen), and R1, R2, R4, R6 and R9 are as defined in the following detailed description.
In an embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —(ZR6)—, and G is (XR7)n—, the compounds of this invention have the following general formula (IV):
wherein W, Y and n are as defined above, Z is nitrogen or CH (when Z is nitrogen, then n is zero, and when Z is CH, then X is nitrogen and n is not zero), and R1, R2, R4, R6 and R7, are as defined in the following detailed description.
In an embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —CHR6—, and G is —XR7—, wherein X is CH or N, and the compound has a structure of Formula (IVA):
wherein R1, R2, R4, R6 and R7 are as defined in the following detailed description.
In an embodiment of compounds of formula (IVA) wherein X is N, the compound has a structure of Formula (IVA1):
wherein R1, R2, R4, R6, R7 are as defined as in the following detailed description.
In certain embodiments, the compounds of this invention have the following general formula (VI):
wherein Ra, Rb, and Rc are defined in the following detailed description, and X1, X2, and X3 may be the same or different and independently selected from hydrogen, hydroxyl, and halide.
The present invention is also related to prodrugs using the libraries containing one or more compounds of formula (I). A prodrug is typically designed to release the active drug in the body during or after absorption by enzymatic and/or chemical hydrolysis. The prodrug approach is an effective means of improving the oral bioavailability or i.v. administration of poorly water-soluble drugs by chemical derivatization to more water-soluble compounds. The most commonly used prodrug approach for increasing aqueous solubility of drugs containing a hydroxyl group is to produce esters containing an ionizable group; e.g., phosphate group, carboxylate group, alkylamino group (Fleisher et al., Advanced Drug Delivery Reviews, 115-130, 1996; Davis et al., Cancer Res., 7247-7253, 2002, Golik et al., Bioorg. Med. Chem. Lett., 1837-1842, 1996).
In certain embodiments, the prodrugs of the present invention have the following general formula (VII):
(VI)-R10
wherein (VI) is formula (VI) as described above; one of Ra, Rb, Rc, X1, X2, and X3 is linked to R10 via Y, Y is oxygen, sulfur, or nitrogen in Ra, Rb, or Rc, or an oxygen in X1, X2, or X3; R10 is hydroxyalkyl, glycosyl, phosphoryloxymethyloxycarbonyl, substituted or unsubstituted piperidine carbonyloxy, or a salt thereof; or Y—R10 is an amino acid residue, a combination of amino acid residues, phosphate, hemimalate, hemisuccinate, dimethylaminoalkylcarbamate, dimethylaminoacetate, or a salt thereof; and when not linked to R10, Ra, Rb, and Rc are as defined in the following detailed description.
In certain embodiments, the prodrugs of the present invention are capable of serving as a substrate for a phosphatase, a carboxylase, or another enzyme and are thereby converted to compounds having general formula (VI).
In some embodiments, R10 of the general formula (VII) is not an amino acid group or a phospho-amino acid group.
The present invention is also directed to libraries containing one or more compounds of formula (I) above, as well as methods for synthesizing such libraries and methods for screening the same to identify biologically active compounds. Compositions containing a compound of this invention in combination with a pharmaceutically acceptable carrier or diluent are also disclosed.
The present invention is also related to methods for identifying a biologically active compound using the libraries containing one or more compound of formula (I). In a related aspect, the present invention provides a method for performing a binding assay, comprising (a) providing a composition comprising a first co-activator and an interacting protein, said first co-activator comprising a binding motif of LXXLL, LXXLI or FXXFF wherein X is any amino acid; (b) combining the first co-activator and the interacting protein with a test compound; and (c) detecting alteration in binding between the first co-activator and the interacting protein in the presence of the compound having general formula (I).
The present invention also provides methods for preventing or treating disorders associated with Wnt signaling pathway. Disorders that may be treated or prevented using a compound or composition of the present invention include tumor or cancer (e.g., KSHV-associated tumor), restenosis associated with angioplasty, polycystic kidney disease, aberrant angiogenesis disease, rheumatoid arthritis disease, ulcerative colitis, tuberous sclerosis complex, hair loss, and Alzheimer's disease. Such methods comprise administering to a subject in need thereof a compound or composition of the present invention in an amount effective to achieve the desired outcome.
In a related aspect, the present invention further provides methods for promoting neurite outgrowth, differentiation of a neural stem cell, and apoptosis in cancer cells. Such methods comprise administering to appropriate cells a compound or composition of the present invention in an amount effective to achieve the desired outcome.
These and other aspects of this invention will be apparent upon reference to the attached figure and following detailed description. To this end, various references are set forth herein, which describe in more detail certain procedures, compounds and/or compositions, and are incorporated by reference in their entirety.
As used in the specification and appended claims, unless specified to the contrary, the following terms have the meaning indicated:
“Amino” refers to the —NH2 radical.
“Amidino” refers to the —C(═NH)—NH2 radical. One or both hydrogens of the amine group of the amidino may be replaced with one or two alkyl groups, as defined herein. The alkyl-derivatized amidino radicals are also referred to as “alkylamidino” and “dialkylamidino,” respectively.
“Cyano” refers to the —CN radical.
“Carboxy” refers to the —COOR radical, wherein R is hydrogen or alkyl, as defined herein.
“Acyl” refers to the —COR radical, wherein R is alkyl, aryl, cycloalkyl, heterocyclyl, as defined herein. For example, R can be methyl, butenyl, cyclopropyl, and the like.
“Alkylsulfonate” refers to —S(O)2—OR radical, wherein R is alkyl, as defined herein.
“Amidosulfonate” refers to the radical —OS(O)2—NR2, each R is independently hydrogen or alkyl. Exemplary amidosulfonates include —OS(O)2NH2, —OS(O)2NHMe.
“Aminocarbonyl” refers to the radical —C(O)NR2, each R is independently hydrogen, alkyl, amino, cycloalkylalkyl, heterocyclyl, alkoxyalkyl, hydroxyalkyl, hydroxy, alkoxy, arylalkyl, heterocyclylalkyl, or two Rs together with the nitrogen atom to which they are attached form a heterocyclyl, as defined herein. When one of the R is hydrogen, the other R is C1-4alkyl, aminocarbonyl can be represented by “C1-4alkylformamidyl”
“N-formamidyl” refers to the radical —NHC(O)H.
“Phenylsulfonyl” refers to the —S(O)2—R radical, wherein R is phenyl, the phenyl can be further substituted with alkyl or chloro.
“Phenylsulfonate” refers to the —O—S(O)2—R radical, wherein R is phenyl, the phenyl can be further substituted with alkyl or chloro.
“Alkylsulfonyl” refers to the —S(O)2—R radical, wherein R is alkyl, as defined herein. Exemplary alkylsulfonyl radicals include methylsulfonyl.
“Alkylthio” refers to the —SR radical wherein R is alkyl, as defined herein.
“Arylthio” refers to the —SR radical wherein R is aryl, as defined herein. The aryl group of the arylthio can be further substituted with alkyl or chloro.
“Aryloxy” refers to the —OR radical wherein R is aryl, as defined herein. The aryl group can be further substituted with alkyl, alkoxy and the like.
“Acyloxyalkyl” refers to the —R′—OC(O)—R radical, wherein R is alkyl, aryl, cycloalkyl, heterocyclyl, as defined herein; and R′ is an alkylene chain, which is a straight or branched hydrocarbon diradical. Examples of alkylene groups include methylene (—CH2—), ethylene (—CH2CH2—) and the like.
“Guanidino” refers to the —NH—C(═NH)—NH2 radical. One or both hydrogens of the amine group of the guanidino may be replaced with one or two alkyl groups, as defined herein. The alkyl-derivatized guanidine radicals are also referred to as “alkylguanidino” and “dialkylguanidino,” respectively.
“Nitro” refers to the —NO2 radical.
“Alkyl” refers to a straight or branched hydrocarbon chain radical consisting solely of carbon and hydrogen atoms. An alkyl may be saturated (containing carbons linked together by single bonds only) or unsaturated (containing carbons linked together by at least one double bond or triple bond.) An alkyl having one to twelve carbon atoms is also referred to as “lower chain alkyl moieties” and can be presented by “C1-12alkyl.” In other embodiments, an alkyl may comprise one to four carbon atoms and be represented by “C1-4alkyl.” In other embodiments, an alkyl may comprise two to five carbon atoms and be represented by “C2-5alkyl.” An alkyl is attached to the rest of the molecule by a single bond. Examples of saturated alkyls include, without limitation, methyl, ethyl, n-propyl, 1-methylethyl(iso-propyl), n-butyl, n-pentyl, 1,1-dimethylethyl (t-butyl), 3-methylhexyl, 2-methylhexyl, and the like. Examples of unsaturated alkyls include, without limitation, ethenyl (i.e., vinyl), prop-1-enyl (i.e., allyl), but-1-enyl, pent-1-enyl, penta-1,4-dienyl, ethynyl (i.e., acetylenyl), prop-1-ynyl and the like.
An alkyl may also be a monocyclic or bicyclic hydrocarbon ring radical, which may include fused or bridged ring systems. A cyclic alkyl is also referred to as “cycloalkyl.” In certain embodiments, a cycloalkyl may comprise three to six carbon atoms and be represented by “C3-6cycloalkyl.” Examples of monocyclic cycloalkyl radicals include, e.g., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl. An unsaturated cycloalkyl contains an endo double bond (i.e., a double bond in the ring). Examples of an unsaturated cycloalkyl include cyclohexenyl. Examples of bicyclic cycloalkyl radicals include, for example, norbornyl (i.e., bicyclo[2.2.1]heptyl), 7,7-dimethyl-bicyclo[2.2.1]heptyl, and the like.
Unless stated otherwise specifically in the specification, the term “alkyl” is meant to include both alkyl and “substituted alkyl,” which refers to an alkyl radical in which one or more hydrogen atoms are replaced by one or more substituents independently selected from: acyl, amidino, alkylamidino, dialkylamidino, alkoxy, aryl, cyano, cycloalkyl, guanidino, alkylguanidino, dialkylguanidino, halo, heterocyclyl, hydrazinyl, hydroxyl, nitro, —OC(O)—R11, —N(R11)2, —C(O)OR11, —C(O)N(R11)2, —N(R11)C(O)OR11, —N(R11)C(O)R11, —N(R11)S(O)tR11 (where t is 1 or 2), —S(O)tOR11 (where t is 1 or 2), —S(O)pR11 (where p is 0, 1 or 2), and —S(O)tN(R11)2 (where t is 1 or 2) where each R11 is independently hydrogen, alkyl, aryl, arylalkyl, heterocyclyl or heterocyclylalkyl, as defined herein.
“Alkoxy” refers to a radical represented by the formula alkyl-O—, wherein alkyl is as defined herein. The alkyl portion can be further substituted by one or more halogen. An alkoxy may also be represented by the number of the carbons in the alkyl group, for example, C1-6alkoxy or C1-3alkoxy.
“Acyl” refers to a radical represented by the formula R12C(O)—, wherein R12 is alkyl or aryl as defined herein. The alkyl or aryl can be optionally substituted with the substituents as described for an alkyl or an aryl group, respectively. Exemplary acyl groups include, without limitation, phenylacyl, benzylacyl, C1-6acyl (e.g., acetyl) and the like.
“Aryl” refers to a radical derived from an aromatic monocyclic or bicyclic ring system by removing a hydrogen atom from a ring carbon atom. The aromatic monocyclic or bicyclic hydrocarbon ring system comprises six to twelve carbon atoms (i.e., C6-12 aryl), wherein at least one of the rings in the ring system is fully unsaturated, i.e., it contains a cyclic, delocalized (4n+2) π-electron system in accordance with the Hückel theory. Optionally, one or two ring atoms of the aryl may be heteroatoms selected from nitrogen, oxygen or sulfur. Examples of aryl radicals include, but are not limited to, phenyl and naphthyl. Unless stated otherwise specifically in the specification, the term “aryl” is meant to include both aryl and “substituted aryl,” which refers to an aryl radical in which one or more hydrogen atoms are replaced by one or more substituents independently selected from: alkyl, acyl, amidino, amidosulfonate, alkoxy, aryloxy, cyano, guanidino, alkylguanidino, dialkylguanidino, halo, hydrazinyl, hydroxyl, nitro, heterocyclyl, —OC(O)—R11, —N(R11)2, —C(O)OR11, —C(O)N(R11)2, —N(R11)C(O)OR11, —N(R11)C(O)R11, —N(R11)S(O)tR11 (where t is 1 or 2), —S(O)tOR11 (where t is 1 or 2), —S(O)pR11 (where p is 0, 1 or 2), and —S(O)tN(R11)2 (where t is 1 or 2) where each R11 is independently hydrogen, alkyl, aryl, arylalkyl, heterocyclyl or heterocyclylalkyl.
“Arylalkyl” refers to an alkyl radical wherein one or more hydrogens of the alkyl are replaced with one or more aryl groups, as defined herein. In various embodiments, arylalkyls include from 7 to 15 carbons and can be represented by C7-15arylalkyl. In certain embodiments, arylalkyl is arylC1-4alkyl wherein a C1-4alkyl is substituted with one aryl or two aryl groups, the latter being also referred to as “diarylalkyl” or “bisarylalkyl”. Examples of arylC1-4alkyl include, but are not limited to arylmethyl, arylethyl, arylpropyl, arylbutyl, bisarylmethyl, bisarylethyl, bisarylpropyl, bisarylbutyl. Exemplary arylalkyl radicals include, without limitation, benzyl, naphthylmethyl, diphenylmethyl, 3,3-bisphenylpropyl and the like. Unless stated otherwise specifically in the specification, the term “arylalkyl” is meant to include both arylalkyl and “substituted arylalkyl,” wherein the alkyl part and/or the aryl part of the arylalkyl radical may be substituted as described herein for the alkyl radical and aryl radical, respectively.
“Cycloalkylalkyl” refers to an alkyl radical wherein one or more hydrogens of the alkyl are replaced with one or more c groups, as defined herein. In certain embodiments, cycloalkylalkyl is cycloalkylC1-2alkyl such as cycloalkylmethyl, cycloalkylethyl and the like. Exemplary cycloalkylalkyl radicals include, without limitation, cyclohexylalkyl (e.g., cyclohexylmethyl and cyclohexylethyl) and cyclopentylalkyl (e.g., cyclopentylmethyl and cyclopentylethyl) and the like. Unless stated otherwise specifically in the specification, the term “cycloalkylalkyl” is meant to include both cycloalkylalkyl and “substituted cycloalkylalkyl,” wherein the alkyl part and/or the cycloalkyl part of the cycloalkylalkyl radical may be substituted as described herein for the alkyl radical and cycloalkyl radical, respectively.
“Glycosyl” refers to a radical by removing the hemiacetal hydroxyl group from a cyclic form of a monosaccharide (e.g., glucose), disaccharide, oligosaccharide (comprising three to ten monosaccharides) or polysaccharide (comprising more than ten monosaccharides.)
“Halo” or “halogen” refers to fluoro, chloro, bromo or iodo radicals.
“Haloalkyl” refers to an alkyl radical, as defined herein, which is substituted by one or more halo radicals, as defined herein. Exemplary haloalkyls include, without limitation: trifluoromethyl, difluoromethyl, trichloromethyl, 2,2,2-trifluoroethyl, 1-fluoromethyl-2-fluoroethyl, 3-bromo-2-fluoropropyl, 1-bromomethyl-2-bromoethyl, and the like. An alkyl substituted with one or more fluoro is also referred to as “perfluoroalkyl,” for example, “perfluoroC1-4alkyl.” The alkyl part of the haloalkyl radical may be optionally substituted as defined herein for an alkyl group.
“Heterocyclyl” refers to a stable heterocyclic ring radical that comprises two to eleven carbon atoms and from one to three heteroatoms selected from nitrogen, oxygen and sulfur. In certain embodiments, the heterocyclyl contains one or two heteroatoms. Unless stated otherwise specifically in the specification, the heterocyclyl radical may be a monocyclic or bicyclic ring system, which may include fused or bridged ring systems. In certain embodiments, the heterocyclyl may be a 5-, 6- or 7-membered monocyclic ring. In other embodiments, the heterocyclyl may be an 8-, 9-, 10-, 11- or 12-membered fused bicyclic ring. The heteroatoms in the heterocyclyl radical may be optionally oxidized. One or more nitrogen atoms, if present, may be optionally quaternized. The heterocyclyl radical may be non-aromatic or aromatic (i.e., at least one ring in the heterocyclyl radical has a delocalized (4n+2)π-electron system in accordance with the Hückel theory.) The heterocyclyl may be attached to the rest of the molecule through any atom of the ring(s). Examples of non-aromatic heterocyclyl radicals include, but are not limited to, dioxolanyl, decahydroisoquinolyl, imidazolinyl, imidazolidinyl, isothiazolidinyl, isoxazolidinyl, morpholinyl, octahydroindolyl, octahydroisoindolyl, 2-oxopiperazinyl, 2-oxopiperidinyl, 2-oxopyrrolidinyl, oxazolidinyl, piperidinyl (also referred to as “piperidyl”), piperazinyl, 4-piperidonyl, 3-pyrrolinyl, pyrrolidinyl, pyrazolidinyl, quinuclidinyl, thiazolidinyl, tetrahydrofuryl, trithianyl, tetrahydropyranyl, thiomorpholinyl, and thiamorpholinyl. Examples of aromatic heterocyclyl radicals include, but are not limited to, azepinyl, acridinyl, benzimidazolyl, benzindolyl, 1,3-benzodioxolyl, benzofuranyl, benzooxazolyl, benzoisoxazolyl, benzo[d]thiazolyl, benzothiadiazolyl, benzo[b][1,4]dioxepinyl, benzo[b][1,4]oxazinyl, 1,4-benzodioxanyl, benzoxazolyl, benzodioxolyl, benzodioxinyl, benzopyranyl, benzopyrazolyl, benzofuranyl, benzofuranonyl, benzothienyl(benzothiophenyl), benzothieno[3,2-d]pyrimidinyl, benzotriazolyl, carbazolyl, chromone, cinnolinyl, cyclopenta[d]pyrimidinyl, dibenzofuranyl, dibenzothiophenyl, furanyl, furanonyl, furo[3,2-c]pyridinyl, isothiazolyl, imidazolyl, indazolyl, indolyl, indazolyl, isoindolyl, indolinyl, isoindolinyl, isoquinolyl, indolizinyl, isoxazolyl, 5,8-methano-5,6,7,8-tetrahydroquinazolinyl, naphthyridinyl, 1,6-naphthyridinonyl, oxadiazolyl, 2-oxoazepinyl, oxazolyl, oxiranyl, 5,6,6a,7,8,9,10,10a-octahydrobenzo[h]quinazolinyl, phenazinyl, phenothiazinyl, phenoxazinyl, phthalazinyl, pteridinyl, purinyl, pyrrolyl, pyrazolyl, pyrazolo[3,4-d]pyrimidinyl, pyridinyl (also referred to as pyridyl), pyrido[3,2-d]pyrimidinyl, pyrido[3,4-d]pyrimidinyl, pyrazinyl, pyrimidinyl, pyridazinyl, pyrrolyl, quinazolinyl, quinoxalinyl, quinolinyl, isoquinolinyl, tetrahydroquinolinyl, 1,2,3,4-tetrahydrocarbazolyl, 5,6,7,8-tetrahydroquinazolinyl, thiazolyl, thiadiazolyl, triazolyl, tetrazolyl, triazin-2-yl, thieno[2,3-d]pyrimidinyl, thieno[3,2-d]pyrimidinyl, thieno[2,3-c]pyridinyl, and thiophenyl (i.e. thienyl). Unless stated otherwise specifically in the specification, the term “heterocyclyl” is meant to include both heterocyclyl and “substituted heterocyclyl,” which refers to a heterocyclyl radical substituted by one or more substituents selected from alkyl, acyl, oxo (e.g., pyridinonyl, pyrrolidonyl), aryl, arylalkyl, acyloxyalkyl, amidino, alkoxy, cyano, guanidino, alkylguanidino, dialkylguanidino, halo, hydrazinyl, hydroxyl, nitro, —OC(O)—R11, —N(R11)2, —C(O)OR11, —C(O)N(R11)2, —N(R11)C(O)OR11, —N(R11)C(O)R11, —N(R11)S(O)tR11 (where t is 1 or 2), —S(O)tOR11 (where t is 1 or 2), —S(O)pR11 (where p is 0, 1 or 2), and —S(O)tN(R11)2 (where t is 1 or 2) where each R11 is independently hydrogen, alkyl, aryl, arylalkyl, heterocyclyl or heterocyclylalkyl.
“Heterocyclylalkyl” refers to an alkyl radical wherein one or more hydrogens of the alkyl are replaced with one or more heterocyclyl groups, as defined herein. If the heterocyclyl is a nitrogen-containing heterocyclyl, the heterocyclyl may be attached to the alkyl radical at the nitrogen atom. In certain embodiments, the alkyl part of the heterocyclylalkyl contains 1-4 carbon atoms and can be represented by heterocyclylC1-4alkyl. Examples of heterocyclylalkyl radicals include, without limitation, morpholinylalkyl such as morpholinylmethyl, piperidylalkyl such as piperidylmethyl, imidazolidinylalkyl such as imidazolidinylmethyl and the like. Additional examples of heterocyclylalkyl radicals, wherein the heterocyclyl part is aromatic, include, but are not limited to: pyridylmethyl, pyridylethyl, pyridylpropyl, pyridylbutyl, quinolinylmethyl, quinolinylethyl, quinolinylpropyl, quinolinylbutyl, indazolylmethyl, indazolylethyl, indazolylpropyl, indazolylbutyl, benzpyrazolylmethyl, benzpyrazolylethyl, benzpyrazolylpropyl, benzpyrazolylbutyl, isoquinolinylmethyl, isoquinolinylethyl, isoquinolinylpropyl, isoquinolinylbutyl, benzotriazolylmethyl, benzotriazolylethyl, benzotriazolylpropyl, benzotriazolylbutyl and the like. Unless stated otherwise specifically in the specification, the term “heterocyclylalkyl” is meant to include both heterocyclylalkyl and “substituted heterocyclylalkyl,” wherein the alkyl part and/or the heterocyclyl part of the heterocyclylalkyl radical may be substituted as described herein for the alkyl radical and the heterocyclyl radical, respectively.
The compounds, or their pharmaceutically acceptable salts may contain one or more asymmetric centers and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)— or (S)— or, as (D)- or (L)- for amino acids. When the compounds described herein contain olefinic double bonds or other centers of geometric asymmetry, and unless specified otherwise, it is intended that the compounds include both E and Z geometric isomers (e.g., cis or trans.) Likewise, all possible isomers, as well as their racemic and optically pure forms, and all tautomeric forms are also intended to be included.
As used herein, “amino acid” is meant to include naturally occurring α-amino acids and/or unnatural amino acids, such as β-amino acids and homoamino acids. Examples of the amino acids include, but are not limited to: alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine, phosphoserine, phosphothreonine, phosphotyrosine, 4-hydroxyproline, hydroxylysine, demosine, isodemosine, gamma-carboxyglutamate, hippuric acid, octahydroindole-2-carboxylic acid, statine, 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, penicillamine, ornithine, 3-methylhistidine, norvaline, beta-alanine, gamma-aminobutylic acid, cirtulline, homocysteine, homoserine, methyl-alanine, para-benzoylphenylalanine, phenylglycine, propargylglycine, sarcosine, methionine sulfone, tert-butylglycine, 3,5-dibromotyrosine and 3,5-diiodotyrosine.
“Amino acid residue” or “amino acid side chain moiety” refers to the portion of an amino acid that remains after losing a water molecule (or alcohol) when the amino acid is condensed with a molecule. Typically, an amino acid is condensed with a molecule, including a compound of any of Formulae (I)-(IV), by forming a peptide bond. In certain embodiments, the amino functional group of the amino acid can be condensed with a carboxylic acid group or its reactive equivalent (e.g., carboxylic anhydride) of the molecule. In other embodiments, the carboxylic acid functional group of the amino acid can be condensed with an amine group of the molecule. Typically, a molecule of water is lost during the formation of the peptide bond. Examples of the “amino acid residues” or “amino acid side chain moiety” include, but are not limited to, residues of alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine, phosphoserine, phosphothreonine, phosphotyrosine, 4-hydroxyproline, hydroxylysine, demosine, isodemosine, gamma-carboxyglutamate, hippuric acid, octahydroindole-2-carboxylic acid, statine, 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, penicillamine, ornithine, 3-methylhistidine, norvaline, beta-alanine, gamma-aminobutylic acid, cirtulline, homocysteine, homoserine, methyl-alanine, para-benzoylphenylalanine, phenylglycine, propargylglycine, sarcosine, methionine sulfone, tert-butylglycine, 3,5-dibromotyrosine, 3,5-diiodotyrosine, glycosylated threonine, glycosylated serine, and glycosylated asparagine.
An “amino acid side chain derivative” refers to a derivative of any of the amino acid side chain moiety as described in Table 1. In certain embodiments, the amino acid side chain derivative is alkyl, acyl, alkoxy, aryl, arylalkyl, heterocyclyl, or heterocyclylalkyl, as defined herein.
A “stereoisomer” refers to a compound made up of the same atoms bonded by the same bonds but having different three-dimensional structures, which are not interchangeable. It is therefore contemplated that various stereoisomers and mixtures thereof and includes “enantiomers,” which refers to two stereoisomers whose molecules are nonsuperimposable mirror images of one another.
A “tautomer” refers to a proton shift from one atom of a molecule to another atom of the same molecule.
“Prodrugs” is meant to indicate a compound that may be converted under physiological conditions or by solvolysis to a biologically active compound described herein. Thus, the term “prodrug” refers to a precursor of a biologically active compound that is pharmaceutically acceptable. A prodrug may be inactive when administered to a subject, but is converted in vivo to an active compound, for example, by hydrolysis. The prodrug compound often offers advantages of solubility, tissue compatibility or delayed release in a mammalian organism (see, Bundgard, H., Design of Prodrugs (1985), pp. 7-9, 21-24 (Elsevier, Amsterdam).
A discussion of prodrugs is provided in Higuchi, T., et al., “Pro-drugs as Novel Delivery Systems,” A.C.S. Symposium Series, Vol. 14, and in Bioreversible Carriers in Drug Design, ed. Edward B. Roche, American Pharmaceutical Association and Pergamon Press, 1987, both of which are incorporated in full by reference herein.
The term “prodrug” is also meant to include any covalently bonded carriers, which release the active compound in vivo when such prodrug is administered to a mammalian subject. Prodrugs of an active compound, as described herein, may be prepared by modifying functional groups present in the active compound in such a way that the modifications are cleaved, either in routine manipulation or in vivo, to the parent active compound. Prodrugs include compounds wherein a hydroxyl, amino or mercapto group is bonded to any group that, when the prodrug of the active compound is administered to a mammalian subject, cleaves to form a free hydroxyl, free amino or free mercapto group, respectively. Examples of the prodrugs include, but are not limited to, acetate, succinate, hemisuccinate, malate, hemimalate, formate and benzoate derivatives of alcohol or amine functional groups in the active compounds and the like. Other examples of the prodrugs include, but are not limited to, amino acid derivatives of alcohol or amine functional groups in the active compounds and the like.
The present invention is directed to conformationally constrained compounds that mimic the secondary structure of reverse-turn regions of biological peptide and proteins (also referred to herein as “reverse-turn mimetics”, and is also directed to chemical libraries relating thereto.
The reverse-turn mimetic structures of the present invention are useful as bioactive agents, including (but not limited to) use as diagnostic, prophylactic and/or therapeutic agents. The reverse-turn mimetic structure libraries of this invention are useful in the identification of bioactive agents having such uses. In the practice of the present invention, the libraries may contain from tens to hundreds to thousands (or greater) of individual reverse-turn structures (also referred to herein as “members”).
In one aspect of the present invention, a reverse-turn mimetic structure is disclosed having the following formula (I):
wherein A is —(CHR3)— or —(C═O)—, B is —(CHR4)— or —(C═O)—, D is —(CHR5)— or —(C═O)—, E is —(ZR6)— or —(C═O)—, G is —(XR7)n—, —(CHR7)—(NR8)—, —(C═O)—(XR9)—, or —(C═O)—, W is —Y(C═O)—, —(C═O)NH—, —(SO2)— or nothing, Y is oxygen, sulfur, or —NH—, X and Z is independently nitrogen or CH, n=0 or 1; and R1, R2, R3, R4, R5, R6, R7, R8 and R9 are the same or different and independently selected from an amino acid side chain moiety or derivative thereof, the remainder of the molecule, a linker and a solid support, and stereoisomers thereof.
In one embodiment, R1, R2, R3, R4, R5, R6, R7, R8 and R9 are independently selected from the group consisting of aminoC2-5alkyl, guanidineC2-5alkyl, C1-4alkylguanidinoC2-5alkyl, diC1-4alkylguanidino-C2-5alkyl, amidinoC2-6alkyl, C1-4alkylamidinoC2-5alkyl, diC1-4alkylamidinoC2-5alkyl, C1-3alkoxy, phenyl, substituted phenyl (where the substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), benzyl, substituted benzyl (where the substituents on the benzyl are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), naphthyl, substituted naphthyl (where the substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), bis-phenyl methyl, substituted bis-phenyl methyl (where the substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), pyridyl, substituted pyridyl, (where the substituents are independently selected from one or more of amino amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), pyridylC1-4alkyl, substituted pyridylC1-4alkyl (where the pyridine substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), pyrimidylC1-4alkyl, substituted pyrimidylC1-4alkyl (where the pyrimidine substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), triazin-2-yl-C1-4alkyl, substituted triazin-2-yl-C1-4alkyl (where the triazine substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), imidazoC1-4alkyl, substituted imidazol C1-4alkyl (where the imidazole substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl or hydroxyl), imidazolinylC1-4alkyl, N-amidinopiperazinyl-N—C0-4alkyl, hydroxyC2-5alkyl, C1-5alkylaminoC2-5alkyl, hydroxyC2-5alkyl, C1-5alkylaminoC2-5alkyl, C1-5dialkylaminoC2-5alkyl, N-amidinopiperidinylC1-4alkyl, 4-aminocyclohexylC0-2alkyl, a bicyclic aryl group having 8 to 11 ring members, which may have 1 to 3 heteroatoms selected from nitrogen, oxygen, or sulfur, and saturated or unsaturated C1-6alkyl.
In one embodiment, R1, R2, R6 of E, and R7, R8 and R9 of G are the same or different and represent the remainder of the compound, and R3 of A, R4 of B or R5 of D is selected from an amino acid side chain moiety or derivative thereof. As used herein, the term “remainder of the compound” means any moiety, agent, compound, support, molecule, linker, amino acid, peptide or protein covalently attached to the reverse-turn mimetic structure at R1, R2, R5, R6, R7, R8 and/or R9 positions. This term also includes amino acid side chain moieties and derivatives thereof.
In another embodiment R3 of A, R5 of D, R6 of E, and R7, R8, and R9 of G are the same or different and represent the remainder of the compound, while one or more of, and in one aspect all of, R1, R2 and R4 of B represent an amino acid sidechain. In this case, the term “remainder of the compound” means any moiety, agent, compound, support, molecule, linker, amino acid, peptide or protein covalently attached to the reverse-turn mimetic structure at R3, R5, R6, R7, R8 and/or R9 positions. This term also includes amino acid side chain moieties and derivatives thereof.
As used herein, the term “remainder of the compound” means any moiety, agent, compound, support, molecule, atom, linker, amino acid, peptide or protein covalently attached to the reverse-turn mimetic structure. This term also includes amino acid side chain moieties and derivatives thereof. In one aspect of the invention, any one or more of the R1, R2, R3, R4, R5, R6, R7, R8 and/or R9 positions may represent the remainder of the compound. In one aspect of the invention, one or more of R1, R2 and R4 represents an amino acid side chain moiety or a derivative thereof.
In the embodiment where A is —(CHR3)— or —(C═O)—; B is —(CHR4)— or —(C═O)—; D is —(CHR5)— or —(C═O)—; E is —ZR6— or —(C═O)—, wherein Z is CH or N; G is —XR7— or —(C═O)—, wherein X is CH or N; W is —(C═O)NH—, —(C═O)O—, —(C═O)S—, —S(O)2— or nothing; the reverse turn mimetic compound of this invention has a structure of Formula (IA):
Wherein each of R1, R2, R3, R4, R5, R6 and R7 is the same or different and independently an amino acid side chain moiety or an amino acid side chain derivative. The reverse turn mimetic compound may be present as an isolated stereoisomer or a mixture of stereoisomers or as a pharmaceutically acceptable salt thereof.
In certain embodiments, R1, R2, R3, R4, R5, R6 and R7 of compounds of formula (IA) are independently: aminoC2-5alkyl, guanidinoC2-5alkyl, C1-4alkylguanidinoC2-5alkyl, diC1-4alkylguanidino-C2-5alkyl, amidinoC2-5alkyl, C1-4alkylamidinoC2-5alkyl, diC1-4alkylamidinoC2-5alkyl, C1-3alkoxy, C1-12alkyl, C6-12aryl, C6-12arylalkyl, phenyl or substituted phenyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoroC1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; naphthyl or substituted naphthyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoroC1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl; benzyl or substituted benzyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; bisphenylmethyl or substituted bisphenylmethyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; pyridyl or substituted pyridyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; pyridylC1-4alkyl, or substituted pyridylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; pyrimidylC1-4alkyl, or substituted pyrimidylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; triazin-2-ylC1-4alkyl, or substituted triazin-2-ylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; imidazolylC1-4alkyl or substituted imidazolylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; or N-amidinopiperazinyl-N—C0-4alkyl, N-amidinopiperidinylC1-4alkyl, or 4-aminocyclohexylC0-2alkyl.
In certain embodiments, R1, R2, R3, R4, R5, R6 and R7 of compounds of formula (IA) are independently: C1-12 alkyl or substituted C1-12 alkyl having one or more substituents independently selected from: amino, guanidino, C1-4alkylguanidino, diC1-4alkylguanidino, amidino, C1-4alkylamidino, diC1-4alkylamidino, C1-5alkylamino, diC1-5alkylamino, hydroxy; phenyl or substituted phenyl having one or more substituents independently selected from: amino, guanidino, C1-4alkylguanidino, diC1-4alkylguanidino, amidino, C1-4alkylamidino, diC1-4alkylamidino, C1-5alkylamino, diC1-5alkylamino, hydroxy; C1-6alkoxy; monocyclic aryl-methyl having 5 to 7 ring members, which may have 1 to 2 heteroatoms selected from nitrogen, oxygen or sulfur, or substituted monocyclic aryl-methyl having one or more substituents independently selected from: halogen, C1-6alkyl, C1-6alkoxy, cyano, hydroxyl; bicyclic aryl-methyl having 8 to 11 ring members, which may have 1 to 2 heteroatoms selected from nitrogen, oxygen or sulfur, or substituted bicyclic aryl-methyl having one or more substituents independently selected from: halogen, C1-6alkyl, C1-6alkoxy, cyano, hydroxyl; or C1-12arylalkyl or substituted C1-12arylalkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl.
In certain embodiments, R2 of compounds of formula (IA) is 3,3-bisphenylpropyl, 2-thienylethyl or tetrahydrofuranylmethyl.
In certain embodiments, R1, R2, R3, R4, R5, R6 and R7 of compounds of formula (IA) are independently: C1-12 alkyl or substituted C1-12 alkyl having one or more substituents independently selected from acyl, carboxy, alkylthio, and phenylsulfonyl; substituted C6-12aryl substituted with amidosulfonate; arylC1-4alkyl or substituted arylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, C1-6cycloalkyl, halogen, perfluoroC1-4alkyl, C1-6alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, C1-6alkyloxyC1-6acyl, morphorlinylC1-6alkyl, aryl, aryloxy, (alkyl)(arylalkyl)amino, heterocyclyl, acyl, amidosulfonate, aminocarbonyl, alkylsulfonate, alkylsulfonyl, alkylthio, arylthio, phenylsulfonate, phenylsulfonyl, morphorlinylC1-3alkoxy, N-formamidyl, and pyrrolidonyl; heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; heterocyclylC1-4alkyl or substituted heterocyclylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, C3-6cycloalkyl, halogen, perfluoroC1-4alkyl, C1-6alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, C1-6alkyloxyC1-6acyl, morphorlinylC1-6alkyl, arylalkyl, aryl, heterocyclyl, acyl, phenylsulfonyl, cycloalkylalkyl, acyloxyalkyl, aminocarbonyl and C1-4alkylformamidyl; cycloalkyl or substituted cycloalkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; or cycloalkylalkyl or substituted cycloalkylalkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl.
In certain embodiments of the compounds described in the preceding paragraph, arylC1-4alkyl is benzyl, bisphenylmethyl, naphthylmethyl or 3,3-bisphenylpropyl; and heterocyclylC1-4alkyl is benzotriazolylC1-4alkyl, benzopyrazolylC1-4alkyl, indazolylC1-4alkyl, isoquinolylC1-4alkyl, benzothiazolylC1-4alkyl, quinolinylC1-4alkyl, imidazolinylC1-4alkyl, thienylC1-4alkyl, tetrahydrofuranylC1-4alkyl, pyridinylC1-4alkyl, benzimidazolylC1-4alkyl, orindolylC1-4alkyl.
In a further embodiment, and in addition to being an amino acid side chain moiety or derivative thereof (or the remainder of the compound in the case of R1, R2, R3, R5, R6, R7, R8 and R9), R1, R2, R3, R4, R5, R6, R7, R8 or R9 may be a linker facilitating the linkage of the compound to another moiety or compound. For example, the compounds of this invention may be linked to one or more known compounds, such as biotin, for use in diagnostic or screening assay. Furthermore, R1, R2, R3, R4, R5, R6, R7, R8 or R9 may be a linker joining the compound to a solid support (such as a support used in solid phase peptide synthesis) or alternatively, may be the support itself. In this embodiment, linkage to another moiety or compound, or to a solid support, is preferable at the R1, R2, R7 or R8, or R9 position, and more preferably at the R1 or R2 position.
In the embodiment wherein A is —(CHR3)—, B is —(C═O)—, D is —(CHR5)—, E is —(C═O)—, and G is —(XR7)n—, the reverse turn mimetic compound of this invention has the following formula (II):
wherein R1, R2, R3, R5, R7, W, X and n are as defined above. In a preferred embodiment, R1, R2 and R7 represent the remainder of the compound, and R3 or R5 is selected from an amino acid side chain moiety.
In the embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —(ZR6)—, G is —(C═O)—(XR9)—, the reverse turn mimetic compound of this invention has the following general formula (III):
wherein R1, R2, R4, R6, R9, W and X are as defined above, Z is nitrogen or CH (when Z is CH, then X is nitrogen). In a preferred embodiment, R1, R2, R6 and R9 represent the remainder of the compound, and R4 is selected from an amino acid side chain moiety.
In a more specific embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —(ZR6)—, and G is (XR7)n—, the reverse turn mimetic compound of this invention has the following formula (IV):
wherein R1, R2, R4, R6, R7, W, X and n are as defined above, and Z is nitrogen or CH. In certain embodiments, when Z is nitrogen, then n is zero; and when Z is CH, then X is nitrogen and n is not zero. In a preferred embodiment, R1, R2, R6 and R7 represent the remainder of the compound, and R4 is selected from an amino acid side chain moiety. In one aspect, R6 or R7 is selected from an amino acid side chain moiety when Z and X are both CH.
In the embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —CHR6—, G is —XR7—, and X is CH or N, the compound has a structure of Formula (IVA):
wherein each of R1, R2, R4, R6, and R7 is the same or different and independently an amino acid side chain moiety or an amino acid side chain derivative.
In the embodiment wherein A is —(C═O)—, B is —(CHR4)—, D is —(C═O)—, E is —CHR6—, G is —XR7—, and X is N, the compound has a structure of Formula (IVA1):
wherein each of R1, R2, R4, R6, and R7 is the same or different and independently an amino acid side chain moiety or an amino acid side chain derivative.
In certain embodiments of the compounds of formula (IVA1), R1, R2, R4, R6, R7 are independently: C1-12 alkyl or substituted C1-12 alkyl having one or more substituents independently selected from: amino, guanidino, C1-4alkylguanidino, diC1-4alkylguanidino, amidino, C1-4alkylamidino, diC1-4alkylamidino, C1-5alkylamino, diC1-5alkylamino and hydroxy; phenyl or substituted phenyl having one or more substituents independently selected from: amino, guanidino, C1-4alkylguanidino, diC1-4alkylguanidino, amidino, C1-4alkylamidino, diC1-4alkylamidino, C1-5alkylamino, diC1-5alkylamino, hydroxy; C1-6alkoxy; monocyclic aryl-methyl having 5 to 7 ring members, which may have 1 to 2 heteroatoms selected from nitrogen, oxygen or sulfur, or substituted monocyclic aryl-methyl having one or more substituents independently selected from: halogen, C1-6alkyl, C1-6alkoxy, cyano and hydroxyl; bicyclic aryl-methyl having 8 to 11 ring members, which may have 1 to 2 heteroatoms selected from nitrogen, oxygen or sulfur, or substituted bicyclic aryl-methyl having one or more substituents independently selected from: halogen, C1-6alkyl, C1-6alkoxy, cyano, hydroxyl; or C1-12arylalkyl or substituted C1-12arylalkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl.
In certain embodiments of the compounds of formula (IVA1), each of R1 and R4 is independently alkyl, aryl, arylalkyl, heterocyclylalkyl or phenol-methyl; R2 is substituted C1-12alkyl having one or more substituents independently selected from: C1-4alkylamino, C1-4dialkylamino, halogen, perfluoroC1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, acyl and phenylsulfonyl; arylC1-4alkyl or substituted arylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, aryl, aryloxy, (alkyl)(arylalkyl)amino, heterocyclyl, acyl, amidosulfonate, aminocarbonyl, alkylsulfonate, alkylsulfonyl, alkylthio, arylthio, phenylsulfonate, phenylsulfonyl, morphorlinylC1-3alkoxy, N-formamidyl and pyrrolidonyl; heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl and hydroxyl; or heterocyclylC1-4alkyl or substituted heterocyclylC1-4alkyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, arylalkyl, aryl, heterocyclyl, acyl, phenylsulfonyl, cycloalkylalkyl, acyloxyalkyl, aminocarbonyl and C1-4-alkylformamidyl; R6 is hydrogen or alkyl; and R7 is hydrogen, alkyl or arylalkyl.
These compounds may be prepared by utilizing appropriate starting component molecules (hereinafter referred to as “component pieces”). Briefly, in the synthesis of reverse-turn mimetic structures having formula (I), first and second component pieces are coupled to form a combined first-second intermediate, if necessary, third and/or fourth component pieces are coupled to form a combined third-fourth intermediate (or, if commercially available, a single third intermediate may be used), the combined first-second intermediate and third-fourth intermediate (or third intermediate) are then coupled to provide a first-second-third-fourth intermediate (or first-second-third intermediate) which is cyclized to yield the reverse-turn mimetic structures of this invention. Alternatively, the reverse-turn mimetic structures of formula (I) may be prepared by sequential coupling of the individual component pieces either stepwise in solution or by solid phase synthesis as commonly practiced in solid phase peptide synthesis.
Specific component pieces and the assembly thereof to prepare compounds of the present invention are illustrated in
wherein R2 is as defined above, and R is a protective group suitable for use in peptide synthesis, where this protection group may be joined to a polymeric support to enable solid-phase synthesis. Suitable R groups include alkyl groups and, in a preferred embodiment, R is a methyl group. In
A “second component piece” may have the following formula S2:
where P is an amino protection group suitable for use in peptide synthesis, L1 is hydroxyl or a carboxyl-activation group, and R4 is as defined above. Preferred protection groups include t-butyl dimethylsilyl (TBDMS), t-butyloxycarbonyl (BOC), methyloxycarbonyl (MOC), 9H-fluorenylmethyloxycarbonyl (FMOC), and allyloxycarbonyl (Alloc). N-Protected amino acids are commercially available; for example, FMOC amino acids are available from a variety of sources. In order for the second component piece to be reactive with the first component piece, L1 is a carboxyl-activation group, and the conversion of carboxyl groups to activated carboxyl groups may be readily achieved by methods known in the art for the activation of carboxyl groups. Suitable activated carboxylic acid groups include acid halides where L1 is a halide such as chloride or bromide, acid anhydrides where L1 is an acyl group such as acetyl, reactive esters such as an N-hydroxysuccinimide esters and pentafluorophenyl esters, and other activated intermediates such as the active intermediate formed in a coupling reaction using a carbodiimide such as dicyclohexylcarbodiimide (DCC). Accordingly, commercially available N-protected amino acids may be converted to carboxylic activated forms by means known to one of skill in the art.
In the case of the azido derivative of an amino acid serving as the second component piece, such compounds may be prepared from the corresponding amino acid by the reaction disclosed by Zaloom et al. (J. Org. Chem. 46:5173-76, 1981).
Alternatively, the first component piece of the invention may have the following formula S1′:
wherein R is as defined above and L2 is a leaving group such as halogen atom or tosyl group, and the second component piece of the invention may have the following formula S2′:
wherein R2, R4 and P are as defined above,
A “third component piece” of this invention may have the following formula S3:
where G, E, L1 and L2 are as defined above. Suitable third component pieces are commercially available from a variety of sources or can be prepared by methods well known in organic chemistry.
In
Thus, as illustrated above, the reverse-turn mimetic compounds of formula (I) may be synthesized by reacting a first component piece with a second component piece to yield a combined first-second intermediate, followed by reacting the combined first-second intermediate with third component pieces sequentially to provide a combined first-second-third-fourth intermediate, and then cyclizing this intermediate to yield the reverse-turn mimetic structure.
The syntheses of representative component pieces of this invention are described in Preparation Examples and working Examples.
The reverse-turn mimetic structures of formula (III) and (IV) may be made by techniques analogous to the modular component synthesis disclosed above, but with appropriate modifications to the component pieces.
The reverse-turn mimetic structures of the present invention are useful as bioactive agents, such as diagnostic, prophylactic, and therapeutic agents. For example, the reverse-turn mimetic structures of the present invention may be used for modulating a cell signaling transcription factor related peptides in a warm-blooded animal, by a method comprising administering to the animal an effective amount of the compound of formula (I).
Further, the reverse-turn mimetic structures of the present invention may also be effective for inhibiting peptide binding to PTB domains in a warm-blooded animal; for modulating G protein coupled receptor (GPCR) and ion channel in a warm-blooded animal; for modulating cytokines in a warm-blooded animal.
It has been found that the compounds of the formula (I), especially compounds of formula (VI) are effective for inhibiting or treating disorders modulated by Wnt-signaling pathway, such as cancer, especially colorectal cancer.
Formula (VI) is shown above, wherein each of Ra, Rb, and Rc is the same or different and independently an amino acid side chain moiety or an amino acid side chain derivative, and X1, X2, and X3 may be the same or different and independently selected from hydrogen, hydroxyl, and halide.
In certain embodiments of the compounds of formula (VI), Ra is a phenyl group; a substituted phenyl group having one or more substituents wherein the one or more substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl groups; a benzyl group; a substituted benzyl group with one or more substituents where the one or more substituents are independently selected from one or more of amino, amidino, guanidino, hydrazino, amidazonyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl group; or a bicyclic aryl group having 8 to 11 ring members, which may have 1 to 3 heteroatoms selected from nitrogen, oxygen or sulfur; Rb is a monocyclic aryl group having 5 to 7 ring members, which may have 1 to 2 heteroatoms selected from nitrogen, oxygen or sulfur, and aryl ring in the compound may have one or more substituents selected from a group consisting of halide, hydroxy, cyano, lower alkyl, and lower alkoxy groups; Rc is a saturated or unsaturated C1-6alkyl, C1-6alkoxy, perfluoro C1-6alkyl group; and X1, X2, and X3 may be the same or different and independently selected from hydrogen, hydroxyl, and halide.
In certain other embodiments of the compounds of formula (VI), Ra is C1-4alkylamino, C1-4dialkylamino, halogen, perfluoroC1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, phenyl substituted with C3-6cycloalkyl, aryl, aryloxy, (alkyl)(arylalkyl)amino, heterocyclyl, acyl, amidosulfonate, aminocarbonyl, alkylsulfonate, alkylsulfonyl, alkylthio, arylthio, phenylsulfonate, phenylsulfonyl, morphorlinylC1-3alkoxy or N-formamidyl; naphthyl or substituted naphthyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, C3-6cycloalkyl, halogen, perfluoroC1-4alkyl, C1-6alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, C1-6alkyloxyC1-6acyl and morphorlinylC1-6alkyl; heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: C1-6alkyl, C3-6cycloalkyl, C1-6alkyloxyC1-6acyl, morphorlinylC1-6alkyl, amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, C3-6cycloalkyl, halogen, nitro, arylalkyl, aryl, heterocyclyl, acyl, phenylsulfonyl, cycloalkylalkyl, acyloxyalkyl, aminocarbonyl and C1-4alkylformamidyl; C1-6acyl; phenylacyl or substituted phenylacyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C3-6cycloalkyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl; benzylacyl or substituted benzylacyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, and cyclopropyl; or phenylsulfonyl or substituted phenylsulfonyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C3-6cycloalkyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl; Rb is aryl or substituted aryl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, and C1-6alkoxy; or heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, and C1-6alkoxy; Rc is C1-6alkyl, C1-6alkoxy, or perfluoroC1-6alkyl; and each of X1, X2 and X3 is independently hydrogen, hydroxyl or halogen.
In certain embodiments of the compounds of formula (VI), especially the compounds described in the preceding paragraph, Ra is heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, C1-4alkylformamidyl and C1-6alkoxy, wherein heterocyclyl is pyridyl, quinolinyl, indazolyl, benzopyrazolyl, indolyl, or isoquinolinyl; and Rb is pyridyl or substituted pyridyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl and C1-6alkoxy; or piperidyl or substituted piperidyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, and C1-6alkoxy.
In another aspect, the present invention provides a pharmaceutical composition comprising a safe and effective amount of the compound having general formula (I) (e.g., the compounds having general formula (IA), (II), (III), (IV), (IVA), (IVA1), and (VI) described above, and the compounds having formula (IVa) and (VII) as described below) and a pharmaceutically acceptable carrier. Such a pharmaceutical composition can be used for treatment of disorders modulated by Wnt signaling pathway, especially by TCF4-β-catenin-CBP complex.
Further, the present invention is to provide a method for inhibiting the growth of tumor cells by using the compound or composition described herein; a method for inducing apoptosis of tumor cells by using the compound or composition described herein; a method for treating a disorder modulated by TCF4-βcatenin-CBP complex by using the compound or composition described herein; and a method of treating cancer such as colorectal cancer by administering the compound or composition described herein together with other anti-cancer agent such as 5-fluorouracil (5-FU), taxol, cisplatin, mitomycin C, tegafur, raltitrexed, capecitabine, and irinotecan, etc.
In a preferred embodiment of the present invention, the compound of the present invention has a (6S,10R)-configuration as follows:
wherein Ra and Rb have the same meanings as defined above.
In another aspect of this invention, prodrugs derived from compounds having general formula (I) are disclosed. The prodrugs generally increase aqueous solubility and thus bioavailability of compounds having general formula (I). In certain embodiments, the prodrugs of the present invention have the following general formula (VII):
(VI)-R10 (VII)
wherein one of Ra, Rb, Rc, X1, X2, and X3 is linked to R10 via Y, wherein Y is an oxygen, sulfur, or nitrogen in Ra, Rb, or Rc, or an oxygen in X1, X2, or X3, and R10 is hydroxyalkyl, glycosyl, phosphoryloxymethyloxycarbonyl, substituted or unsubstituted piperidine carbonyloxy, or a salt thereof; or Y—R10 is an amino acid residue, a combination of amino acid residues, phosphate, hemimalate, hemisuccinate, dimethylaminoalkylcarbamate, dimethylaminoacetate, or a salt thereof; and when not linked to R10, Ra, Rb, and Rc are defined as they are in formula (VI).
For example, in certain embodiments of the compounds of formula (VII), Ra is C1-4alkylamino, C1-4dialkylamino, halogen, perfluoroC1-4alkyl, C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, phenyl substituted with C3-6cycloalkyl or alkylthio; naphthyl or substituted naphthyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, C3-6cycloalkyl, halogen, perfluoroC1-4alkyl, C1-6alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, hydroxyl, C1-6alkyloxyC1-6acyl and morphorlinylC1-6alkyl; heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: C1-6alkyl, C3-6cycloalkyl, C1-6alkyloxyC1-6acyl, morphorlinylC1-6alkyl, amino, amidino, guanidino, hydrazino, C1-4alkylamino, C1-4dialkylamino, C3-6cycloalkylalkyl, halogen, nitro, acyl, phenylsulfonyl, morpholinylC1-3alkoxy, aryl, arylalkyl, and C1-4alkylformamidyl; C1-6acyl; phenylacyl or substituted phenylacyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C3-6cycloalkyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl; benzylacyl or substituted benzylacyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, and cyclopropyl; or phenylsulfonyl or substituted phenylsulfonyl having one or more substituents independently selected from: amino, amidino, guanidino, hydrazino, C3-6cycloalkyl, C1-4alkylamino, C1-4dialkylamino, halogen, perfluoro C1-4alkyl, C1-3alkoxy, nitro, carboxy, cyano, sulfuryl, and hydroxyl; Rb is aryl or substituted aryl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, and C1-6alkoxy; or heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, and C1-6alkoxy; Rc is C1-6alkyl, C1-6alkoxy, or perfluoroC1-6alkyl; and each of X1, X2 and X3 is independently hydrogen, hydroxyl or halogen.
In certain embodiments of the compounds of formula (VII), especially, the compounds described in the preceding paragraph, Ra is heterocyclyl or substituted heterocyclyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, C1-4alkylformamidyl and C1-6alkoxy, wherein heterocyclyl is pyridyl, quinolinyl, indazolyl, benzopyrazolyl, indolyl, or isoquinolinyl; and Rb is pyridyl or substituted pyridyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl and C1-6alkoxy; or piperidyl or substituted piperidyl having one or more substituents independently selected from: halogen, hydroxy, cyano, C1-6alkyl, and C1-6alkoxy.
In another aspect of this invention, libraries containing reverse-turn mimetic structures of the present invention are disclosed. Once assembled, the libraries of the present invention may be screened to identify individual members having bioactivity. Such screening of the libraries for bioactive members may involve; for example, evaluating the binding activity of the members of the library or evaluating the effect the library members have on a functional assay. Screening is normally accomplished by contacting the library members (or a subset of library members) with a target of interest, such as, for example, an antibody, enzyme, receptor or cell line. Library members which are capable of interacting with the target of interest, are referred to herein as “bioactive library members” or “bioactive mimetics”. For example, a bioactive mimetic may be a library member which is capable of binding to an antibody or receptor, or which is capable of inhibiting an enzyme, or which is capable of eliciting or antagonizing a functional response associated, for example, with a cell line. In other words, the screening of the libraries of the present invention determines which library members are capable of interacting with one or more biological targets of interest. Furthermore, when interaction does occur, the bioactive mimetic (or mimetics) may then be identified from the library members. The identification of a single (or limited number) of bioactive mimetic(s) from the library yields reverse-turn mimetic structures which are themselves biologically active, and thus are useful as diagnostic, prophylactic or therapeutic agents, and may further be used to significantly advance identification of lead compounds in these fields.
Synthesis of the peptide mimetics of the library of the present invention may be accomplished using known peptide synthesis techniques, in combination with the first, second and third component pieces of this invention. More specifically, any amino acid sequence may be added to the N-terminal and/or C-terminal of the conformationally constrained reverse-turn mimetic. To this end, the mimetics may be synthesized on a solid support (such as PAM resin) by known techniques (see, e.g., John M. Stewart and Janis D. Young, Solid Phase Peptide Synthesis, 1984, Pierce Chemical Comp., Rockford, Ill.) or on a silyl-linked resin by alcohol attachment (see Randolph et al., J. Am. Chem. Soc. 117:5712-14, 1995).
In addition, a combination of both solution and solid phase synthesis techniques may be utilized to synthesize the peptide mimetics of this invention. For example, a solid support may be utilized to synthesize the linear peptide sequence up to the point that the conformationally constrained reverse-turn is added to the sequence. A suitable conformationally constrained reverse-turn mimetic structure which has been previously synthesized by solution synthesis techniques may then be added as the next “amino acid” to the solid phase synthesis (i.e., the conformationally constrained reverse-turn mimetic, which has both an N-terminus and a C-terminus, may be utilized as the next amino acid to be added to the linear peptide). Upon incorporation of the conformationally constrained reverse-turn mimetic structures into the sequence, additional amino acids may then be added to complete the peptide bound to the solid support. Alternatively, the linear N-terminus and C-terminus protected peptide sequences may be synthesized on a solid support, removed from the support, and then coupled to the conformationally constrained reverse-turn mimetic structures in solution using known solution coupling techniques.
In another aspect of this invention, methods for constructing the libraries are disclosed. Traditional combinatorial chemistry techniques (see, e.g., Gallop et al., J. Med. Chem. 37:1233-1251, 1994) permit a vast number of compounds to be rapidly prepared by the sequential combination of reagents to a basic molecular scaffold. Combinatorial techniques have been used to construct peptide libraries derived from the naturally occurring amino acids. For example, by taking 20 mixtures of 20 suitably protected and different amino acids and coupling each with one of the 20 amino acids, a library of 400 (i.e., 202) dipeptides is created. Repeating the procedure seven times results in the preparation of a peptide library comprised of about 26 billion (i.e., 208) octapeptides.
Specifically, synthesis of the peptide mimetics of the library of the present invention may be accomplished using known peptide synthesis techniques, for example, the General Scheme of [4,4,0] Reverse-Turn Mimetic Library as follows:
Synthesis of the peptide mimetics of the libraries of the present invention was accomplished using a FlexChem Reactor Block which has 96 well plates by known techniques. In the above scheme ‘Pol’ represents a bromoacetal resin (Advanced ChemTech) and detailed procedure is illustrated below.
Step 1
A bromoacetal resin (37 mg, 0.98 mmol/g) and a solution of R2-amine in DMSO (1.4 mL) were placed in a Robbins block (FlexChem) having 96 well plates. The reaction mixture was shaken at 60° C. using a rotating oven [Robbins Scientific] for 12 hours. The resin was washed with DMF, MeOH, and then DCM
Step 2
A solution of commercial available FmocAmino Acids (4 equiv.), PyBob (4 equiv.), HOAt (4 equiv.), and DIEA (12 equiv.) in DMF was added to the resin. After the reaction mixture was shaken for 12 hours at room temperature, the resin was washed with DMF, MeOH, and then DCM.
Step 3
To the resin swollen by DMF before reaction was added 25% piperidine in DMF and the reaction mixture was shaken for 30 min at room temperature. This deprotection step was repeated again and the resin was washed with DMF, Methanol, and then DCM. A solution of hydrazine acid (4 equiv.), HOBt (4 equiv.), and DIC (4 equiv.) in DMF was added to the resin and the reaction mixture was shaken for 12 hours at room temperature. The resin was washed with DMF, MeOH, and then DCM.
Step 4a (where Hydrazine Acid is MOC Carbamate)
The resin obtained in Step 3 was treated with formic acid (1.2 mL each well) for 18 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under a reduced pressure using SpeedVac [SAVANT] to give the product as oil. The product was diluted with 50% water/acetonitrile and then lyophilized after freezing.
Step 4B (where Fmoc Hydrazine Acid is Used to Make Urea Through Isocyanate)
To the resin swollen by DMF before reaction was added 25% piperidine in DMF and the reaction mixture was shaken for 30 min at room temperature. This deprotection step was repeated again and the resin was washed with DMF, Methanol, then DCM. To the resin swollen by DCM before reaction was added isocyanate (5 equiv.) in DCM. After the reaction mixture was shaken for 12 hours at room temperature the resin was washed with DMF, MeOH, then DCM. The resin was treated with formic acid (1.2 mL each well) for 18 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under a reduced pressure using SpeedVac [SAVANT] to give the product as oil. The product was diluted with 50% water/acetonitrile and then lyophilized after freezing.
Step 4c (where Fmoc-Hydrazine Acid is Used to Make Urea Through Active Carbamate)
To the resin swollen by DMF before reaction was added 25% piperidine in DMF and the reaction mixture was shaken for 30 min at room temperature. This deprotection step was repeated again and the resin was washed with DMF, MeOH, and then DCM. To the resin swollen by DCM before reaction was added p-nitrophenyl chloroformate (5 equiv.) and diisopropyl ethylamine (5 equiv.) in DCM. After the reaction mixture was shaken for 12 hours at room temperature, the resin was washed with DMF, MeOH, and then DCM. To the resin was added primary amines in DCM for 12 hours at room temperature and the resin was washed with DMF, MeOH, and then DCM. After reaction the resin was treated with formic acid (1.2 mL each well) for 18 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under a reduced pressure using SpeedVac [SAVANT] to give the product as oil. The product was diluted with 50% water/acetonitrile and then lyophilized after freezing.
To generate these block libraries the key intermediate hydrazine acids were synthesized according to the procedure illustrated in Preparation Examples.
Tables 2A, 2B and 2C show a [4,4,0] Reverse turn mimetics library which can be prepared according to the present invention, of which representative preparation is given in Example 4.
In addition, synthesis of the peptide mimetics of the library of the present invention may be accomplished using the General Scheme of [4,3,0] Reverse-Turn Mimetic Library as follows:
Synthesis of the peptide mimetics of the bicyclic template libraries of the present invention was accomplished using FlexChem Reactor Block which has 96 well plate by known techniques. In the above scheme ‘Pol’ represents Bromoacetal resin (Advanced ChemTech) and detailed procedure is illustrated below.
Step 1
The bromoacetal resin (1.6 mmol/g) and a solution of R1 amine in DMSO (2M solution) were placed in 96 well Robbins block (FlexChem). The reaction mixture was shaken at 60° C. using rotating oven [Robbins Scientific] for 12 hours. The resin was washed with DMF, MeOH, and then DCM
Step 2
A solution of commercial available Fmoc-Amino Acids (4 equiv.), PyBob (4 equiv.), HOAt (4 equiv.), and DIEA (12 equiv.) in DMF was added to the resin. After the reaction mixture was shaken for 12 hours at room temperature, the resin was washed with DMF, MeOH, and then DCM.
Step 3
To the resin swollen by DMF before reaction was added 25% piperidine in DMF. After the reaction mixture was shaken for 30 min at room temperature. This deprotection step was repeated again and then washed with DMF, Methanol, then DCM. A solution of hydrazine carbamoyl chloride (4 equiv.), HOBt (4 equiv.), and DIC (4 equiv.) in DMF was added to the resin. After the reaction mixture was shaken for 12 hours at room temperature, the resin was washed with DMF, MeOH, and then DCM.
Step 4
To the resin swollen by DMF before reaction was added 25% piperidine in DMF. After the reaction mixture was shaken for 30 min at room temperature. This deprotection step was repeated again and then washed with DMF, Methanol, then DCM. To the resin swollen by DCM before reaction was added R1-isocyanate (5 equiv.) in DCM. After the reaction mixture was shaken for 12 hours at room temperature the resin was washed with DMF, MeOH, then DCM.
Step 5
The resin was treated with formic acid (1.2 mL each well) for 18 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under reduced pressure using SpeedVac [SAVANT] to give the product as oil. These products were diluted with 50% water/acetonitrile and then lyophilized after freezing.
Table 3 shows a [4,3,0] reverse turn mimetics library which can be prepared according to the present invention, of which representative preparation is given in Example 5.
In a further aspect of this invention, the present invention provides methods for screening the libraries for bioactivity and isolating bioactive library members.
In yet another aspect, the present invention provides a method for carrying out a binding assay. The method includes providing a composition that includes a first co-activator, an interacting protein, and a test compound. The amino acid structure of the first co-activator includes a binding motif of LXXLL, LXXLI or FxxFF wherein X is any amino acid. The method further includes detecting an alteration in binding between the first co-activator and the interacting protein due to the presence of the compound, and then characterizing the test compound in terms of its effect on the binding.
The assay may be carried out by any means that can measure the effect of a test compound on the binding between two proteins. Many such assays are known in the art and can be utilized in the method of the present invention, including the so-called Two-Hybrid and Split-Hybrid systems.
The Two-Hybrid system, and various means to carry out an assay using this system, are described in, e.g., U.S. Pat. No. 6,410,245. The Split-Hybrid system has been described by, e.g., Hsiu-Ming Shiu et al. Proc. Natl. Acad. Sci. USA, 93:13896-13901, November 1996; and John D. Crispino, et al. Molecular Cell, 3:1-20, February 1999. In the Split-Hybrid system, a fusion protein is utilized where protein X is fused to the lexA DNA binding domains (pLexA) and protein Y is fused to the transcription activator VP16 (pSHM.1-LacZ). Interaction between lexA-X and VP16-Y leads to the expression of the Tetracycline repressor protein (TetR). TetR prevents transcription of the HIS3 reporter gene, making the cells unable to grow on media lacking histidine. Disruption of protein-protein interaction will restore the ability of the cells to grow on such media by shutting down expression of the tetracycline repressor. Accordingly, compounds of the present invention may be added to the growing cells, and if the addition of the compound restores the ability of the cells to grow on the media, the compound may be seen as an effective disruptor of the protein-protein interaction.
The yeast strains required to make the Split-Hybrid system work can be employed with two hybrid LexA/VP16 constructs such as those described by Stanley M. Hollenberg, et al. Molecular and Cellular Biology 15(7):3813-3822, July 1995. A useful modification of the Split-Hybrid system was utilized by Takemaru, K. I. and Moon, R. T. J. of Cell Biol. 149:249-254, 2000.
Other assay formats are also suitable. For example, reporter gene assays for AP-1, ELISA, for example, blocking the production of IL-2 by a T-cell line after stimulation with CD3 and CD28 to look for inhibitors of IL-2 transcription. Direct binding assays (between coactivators and their partners) can be performed by surface plasmon resonance spectroscopy (Biacore, Sweden, manufactures suitable instruments) or ELISA.
Exemplary transcriptional regulators include, without limitation, VP16, VP64, p300, CBP, PCAF, SRC1 PvALF, AtHD2A and ERF-2. See, for example, Robyr et al. (2000) Mol. Endocrinol. 14:329-347; Collingwood et al. (1999) J. Mol. Endocrinol. 23:255-275; Leo et al. (2000) Gene 245:1-11; Manteuffel-Cymborowska (1999) Acta Biochim. Pol. 46:77-89; McKenna et al. (1999) J. Steroid Biochem. Mol. Biol. 69:3-12; Malik et al. (2000) Trends Biochem. Sci. 25:277-283; and Lemon et al. (1999) Curr. Opin. Genet. Dev. 9:499-504. Other exemplary transcription factors include, without limitation, OsGAI, HALF-1, C1, AP1, ARF-5, -6, -7, and -8, CPRF1, CPRF4, MYC-RP/GP, and TRAB1. See, for example, Ogawa et al. (2000) Gene 245:21-29; Okanami et al. (1996) Genes Cells 1:87-99; Goff et al. (1991) Genes Dev. 5:298-309; Cho et al. (1999) Plant Mol. Biol. 40:419-429; Ulmason et al. (1999) Proc. Natl. Acad. Sci. USA 96:5844-5849; Sprenger-Haussels et al. (2000) Plant J. 22:1-8; Gong et al. (1999) Plant Mol. Biol. 41:33-44; and Hobo et al. (1999) Proc. Natl. Acad. Sci. USA 96:15, 348-15,353.
In a preferred embodiment, the transcriptional coactivator is a human transcriptional coactivator. In another preferred embodiment, the transcriptional coactivator is a member of the p300/CBP family of co-activators which have histone acetyltransferase activity. p300 is described for example by Eckner et al, 1994 and CBP by Bannister and Kouzarides, 1996. For the purposes of the present invention, reference to p300/CBP refers to human allelic and synthetic variants of p300, and to other mammalian variants and allelic and synthetic variants thereof, as well as fragments of said human and mammalian forms of p300. In one aspect of the assay, the interacting protein is a transcription factor or a second co-activator.
In one aspect of the assay, the interacting protein is any one of RIP140; SRC-1 (NCoA-1); TIF2 (GRIP-1; SRC-2); p (CIP; RAC3; ACTR; AIB-1; TRAM-1; SRC-3); CBP (p300); TRAPs (DRIPs); PGC-1; CARM-1; PRIP (ASC-2; AIB3; RAP250; NRC); GT-198; and SHARP (CoAA; p68; p72). In another aspect of the assay, the interacting protein is any one of TAL 1; p73; MDm2; TBP; HIF-1; Ets-1; RXR; p65; AP-1; Pit-1; HNF-4; Stat2; HPV E2; BRCA1; p45 (NF-E2); c-Jun; c-myb; Tax; Sap 1; YY1; SREBP; ATF-1; ATF-4; Cubitus; Interruptus; Gli3; MRF; AFT-2; JMY; dMad; PyLT: HPV E6; CITTA; Tat; SF-1; E2F; junB; RNA helicase A; C/EBP β; GATA-1; Neuro D; Microphthalimia; E1A; TFIIB; p53; P/CAF; Twist; Myo D; pp 9O RSK; c-Fos; and SV40 Large T. In another aspect of the assay, the interacting protein is any one of ERAP140; RIP140; RIP160; Trip1; SWI1 (SNF); ARA70; RAP46; TIF1; TIF2; GRIP1; and TRAP. In another aspect of the invention, the interacting protein is any one of VP16; VP64; p300; CBP; PCAF; SRC1 PvALF; AtHD2A; ERF-2; OsGAI; HALF-1; C1; AP-1; ARF-5; ARF-6; ARF-7; ARF-8; CPRF1; CPRF4; MYC-RP/GP; and TRAB1. In another aspect of the invention, the first co-activator is CBP or p300.
The test compound is selected from compounds as described herein. For example, compounds having the formula (I), (II), (III), (IV), (VI) and (VIa). Typically, a test compound will be evaluated at several different concentrations, where these concentrations will be selected, in part, based on the conditions of the assay, e.g., the concentrations of the first co-activator and the interacting protein. Concentrations in the range of about 0.1 to 10 μM are typical. In one aspect, the assay evaluates the relative efficacy of two compounds to affect the binding interaction between two proteins, where at least one of those two compounds is a compound of the present invention. The more effective compound can than serve as a reference compound in a study of the relationship between compound structure and compound activity.
The libraries of the present invention were screened for bioactivity by various techniques and methods. In general, the screening assay may be performed by (1) contacting the mimetics of a library with a biological target of interest, such as a receptor, to allow binding between the mimetics of the library and the target to occur, and (2) detecting the binding event by an appropriate assay, such as the calorimetric assay disclosed by Lam et al. (Nature 354:82-84, 1991) or Griminski et al. (Biotechnology 12:1008-1011, 1994) (both of which are incorporated herein by reference). In a preferred embodiment, the library members are in solution and the target is immobilized on a solid phase. Alternatively, the library may be immobilized on a solid phase and may be probed by contacting it with the target in solution.
Table 4 below shows compounds for bioactivity test selected from the library of the present invention and IC50 values thereof, which are measured by the Reporter gene assay as described in Example 6.
It has been found according to the present invention that compounds of general formula (I), and especially the compounds of general formula (VI), can inhibit CBP-mediated transcriptional activation in cancer cells due to their specific binding to CBP. This conclusion is supported by immunoprecipitation of CBP of SW480 cells with compounds of the present invention.
The compounds of the present invention can also inhibit the survivin expression in SW480 cells, and therefore, inhibit the oncogenic activity in cancer cells. The compounds of the present invention can be used for inhibiting cancer cells, and thus, would be useful for the regulation of cell growth. Supporting such results, the compounds of the present invention further shows that it can induce the caspase-3 activation in SW480 cells, and therefore, induce the apoptotic activity in cells. The compounds of the present invention can be also advantageously used for inducing apoptosis in cells.
To confirm the oncogenic activity in cancer cell in in vitro MTS cytotoxicity assay was tested by following method.
(1) Cytotoxicity Test
SW480 or HCT116 cells were placed into 96 well microplate (104 cells/well) and incubated for 24 hours at 37° C. The cells were treated with TCF4 compound at various concentrations for 24 hours. 20 μl of MTS solution (Promega) was added into each well and incubated for 2 hours at 37° C. Cell viability was measured by reading the absorbance at 490 nm using microplate reader (Molecular Device) and cytotoxicity of a compound at each concentration was calculated.
(2) Growth Inhibition Assay
SW480 or HCT116 cells were placed into 96 well microplate (104 cells/well) and incubated for 24 hours at 37° C. 20 μl of [3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt](MTS) solution (Promega) was added into each well and the absorbance after 2 hour incubation at 37° C. (negative control) was read. And then, the cells were treated with TCF4 compound at various concentrations for 48 hours. 20 μl of MTS solution (Promega) was added into each well and incubated for 2 hour at 37° C. Cell viability was measured by reading the absorbance at 490 nm using a microplate reader (Molecular device) and cytotoxicity of a compound at each concentration was calculated.
The results of oncogenic activity for selected library compounds were shown in the Table 5. The compound numbers in Table 5 are unrelated to the compound numbers in Table 4.
In other aspects the present invention provides pharmaceutical compositions containing a compound described herein and a pharmaceutically acceptable carrier. The compounds or compositions of the present invention may be used in various methods (e.g., treating cancer or Alzheimer's disease) of the present invention as described in detail below.
The pharmaceutical composition of the present invention is formulated to be compatible with its intended route of administration. Examples of routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration. Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. In addition, pH may be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide. The parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic.
Pharmaceutical compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. For intravenous administration, suitable carriers include physiological saline, bacteriostatic water, Cremophor EL™ (BASF, Parsippany, N.J.) or phosphate buffered saline (PBS). In all cases, the composition must be sterile and should be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as mannitol, sorbitol, sodium chloride in the composition. Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.
Sterile injectable solutions can be prepared by incorporating the compound described herein (including both active compounds and prodrugs of the active compounds) in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the compound into a sterile vehicle that contains a dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying which yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
Oral compositions generally include an inert diluent or an edible carrier. They can be enclosed in gelatin capsules or compressed into tablets. For the purpose of oral therapeutic administration, compound described herein can be incorporated with excipients and used in the form of tablets, troches, or capsules. Oral compositions can also be prepared using a fluid carrier for use as a mouthwash, wherein the compound in the fluid carrier is applied orally and swished and expectorated or swallowed. Pharmaceutically compatible binding agents, and/or adjuvant materials can be included as part of the composition. The tablets, pills, capsules, troches and the like can contain any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring.
For administration by inhalation, the compounds are delivered in the form of an aerosol spray from pressured container or dispenser that contains a suitable propellant, e.g., a gas such as carbon dioxide, or a nebulizer.
Systemic administration can also be by transmucosal or transdermal means. For transmucosal or transdermal administration, penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid derivatives. Transmucosal administration can be accomplished through the use of nasal sprays or suppositories. For transdermal administration, the compounds described herein are formulated into ointments, salves, gels, or creams as generally known in the art.
The compounds can also be prepared in the form of suppositories (e.g., with conventional suppository bases such as cocoa butter and other glycerides) or retention enemas for rectal delivery.
In one embodiment, the compounds described herein are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems. Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art. The materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc. Liposomal suspensions (including liposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Pat. No. 4,522,811.
It is especially advantageous to formulate oral or parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subject to be treated; each unit containing a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. The specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved, and the limitations inherent in the art of compounding such an active compound for the treatment of individuals.
Toxicity and therapeutic efficacy of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD50/ED50. Compounds that exhibit large therapeutic indices are preferred. While compounds that exhibit toxic side effects may be used, care should be taken to design a delivery system that targets such compounds to the site of affected tissue in order to minimize potential damage to uninfected cells and, thereby, reduce side effects.
The data obtained from the cell culture assays and animal studies can be used in formulating a range of dosage for use in humans. The dosage of such compounds lies preferably within a range of circulating concentrations that include the ED50 with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized. For any compound used in the method of the invention, the therapeutically effective dose can be estimated initially from cell culture assays. A dose may be formulated in animal models to achieve a circulating plasma concentration range that includes the IC50 (i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms) as determined in cell culture. Such information can be used to more accurately determine useful doses in humans. Levels in plasma may be measured, for example, by high performance liquid chromatography.
For instance, in certain embodiments, a pharmaceutical composition of the present invention is one suitable for oral administration in unit dosage form such as a tablet or capsule that contains from about 1 mg to about 1 g of the compound of this invention. In some other embodiments, a pharmaceutical composition of the present invention is one suitable for intravenous, subcutaneous or intramuscular injection. A patient may receive, for example, an intravenous, subcutaneous or intramuscular dose of about 1 μg/kg to about 1 g/kg of the compound of the present invention. The intravenous, subcutaneous and intramuscular dose may be given by means of a bolus injection or by continuous infusion over a period of time. Alternatively a patient will receive a daily oral dose approximately equivalent to the daily parenteral dose, the composition being administered 1 to 4 times per day.
The following table illustrates representative pharmaceutical dosage forms containing the compound or pharmaceutically-acceptable salt thereof for therapeutics or prophylactic use in humans:
The pharmaceutical composition containing the compound described herein can be used for treatment of disorders modulated by Wnt signaling pathway, especially cancer, more especially colorectal cancer.
In one aspect, the present invention provides compounds that inhibit the binding of a radiolabeled enkephalin derivative to the δ and μ opiate receptors. Accordingly, the reverse-turn mimetics or prodrugs of the present invention may be used as receptor agonists and as potential analgesic agents.
In another aspect, the present invention provides methods for inhibiting tumor growth. Such methods comprise the step of administering to a subject (e.g., a mammalian subject) having a tumor a compound or a composition described herein in an amount effective to inhibit tumor growth. A compound or composition inhibits tumor growth if the tumor sizes are statistically significantly smaller in subjects with the treatment of the compound or composition than those without the treatment.
The inhibitory effect of a particular compound or composition of the present invention on tumor growth may be characterized by any appropriate methods known in the art. For instance, the effect of the compound or composition on survivin expression may be measured. Compounds or compositions down-regulate survivin expression are likely to have inhibitory effects on tumor growth. In addition, assays using tumor cell lines (e.g., soft agar assays using SW480 cells) and animal models for tumor growth (e.g., nude mice grafted with tumor cells and Min mouse model) may also be used to evaluate the inhibitory effect on tumor growth of a given compound or composition as described in detail in the examples. Other exemplary animal models or xenografts for tumor growth include those for breast cancer (Guo et al., Cancer Res. 62: 4678-84, 2002; Lu et al., Breast Cancer Res. Treat. 57: 183-92, 1999), pancreatic cancer (Bouvet et al., Cancer Res. 62: 1534-40, 2002), ovarian tumor (Nilsson et al., Cancer Chemother. Pharmacol. 49: 93-100, 2002; Bao et al., Gynecol. Oncol. 78: 373-9, 2000), melanoma (Demidem et al., Cancer Res. 61: 2294-300, 2001), colorectal cancer (Brown et al., Dig. Dis. Sci. 45: 1578-84, 2000; Tsunoda et al., Anticancer Res. 19: 1149-52, 1999; Cao et al., Clin. Cancer Res. 5: 267-74, 1999; Shawler et al., J. Immunother. Emphasis Tumor Immunol. 17: 201-8, 1995; McGregor et al., Dis. Colon. Rectum. 36: 834-9, 1993; Verstijnen et al., Anticancer Res. 8: 1193-200, 1988), hepatocellular cancer (Labonte et al., Hepatol. Res. 18: 72-85, 2000), and gastric cancer (Takahashi et al., Int. J. Cancer 85: 243-7, 2000).
The compound or composition that inhibits tumor growth may be administrated into a subject with a tumor via an appropriate route depending on, for example, the tissue in which the tumor resides. The appropriate dosage may be determined using knowledge and techniques known in the art as described above. The effect of the treatment of the compound or composition on tumor growth may also be monitored using methods known in the art. For instance, various methods may be used for monitoring the progression and/or growth of colorectal cancer, including colonoscopy, sigmoidoscopy, biopsy, computed tomograph, ultrasound, magnetic resonance imaging, and positron emission tomography. Methods for monitoring the progression and/or growth of ovarian cancer include, for example, ultrasound, computed tomography, magnetic resonance imaging, chest X-ray, laparoscopy, and tissue sampling.
In a related aspect, the present invention provides a method for treating or preventing (i.e., reducing the risk of) cancer. Such methods comprise the step of administering to a subject in need thereof a compound or composition described herein in an amount effective to treat or prevent (i.e., reduce the risk of) cancer in the subject. Treating cancer is understood to encompass reducing or eliminating cancer progression (e.g., cancer growth and metastasis). Preventing cancer is understood to encompass preventing or delaying the onset of cancer. Various types of cancer may be treated or prevented by the present invention. They include, but are not limited to, lung cancer, breast cancer, colorectal cancer, stomach cancer, pancreatic cancer, liver cancer, uterus cancer, ovarian cancer, gliomas, melanoma, lymphoma, and leukemia.
In certain embodiments, the method of treating or preventing cancer comprises administering to a subject in need thereof a compound or composition described herein in an amount effective to treat aberrant angiogenesis as described in more detail below.
In certain embodiments, the method of treating or preventing cancer comprises administering to a subject in need thereof a compound or composition described herein in an amount effective to promote apoptosis in the cancer cells as described in more detail below.
In certain embodiments, the method of treating or preventing cancer comprises administering to a subject in need thereof a compound or composition described herein in an amount effective to inhibit survivin expression as described in more detailed below.
A subject in need of treatment may be a human or non-human primate or other animal with various types of cancer. A subject in need of prevention (i.e., reduction of risk) may be a human or non-human primate or other animal that is at risk for developing cancer. Methods for diagnosing cancer and screening for individuals with high risk of cancer are known in the art and may be used in the present invention. For instance, colorectal cancer may be diagnosed by fecal occult blood test, sigmoidoscopy, colonoscopy, barium enema with air contrast, and virtual colonoscopy. An individual with high risk of colorectal cancer may have one or more colorectal cancer risk factors such as a strong family history of colorectal cancer or polyps, a known family history of hereditary colorectal cancer syndromes, a personal history of adenomatous polyps, and a personal history of chronic inflammatory bowel disease.
A compound described herein useful in cancer treatment or prevention (i.e., reduction of risk) may be identified by appropriate methods known in the art. Methods that may be used to select compounds for inhibitory effect on tumor growth as described above may also be used. The route of administration, the dosage of a given compound, the effectiveness of the treatment may be determined using knowledge and techniques known in the art. Factors that may be considered in making such a determination include, for example, type and stage of the cancer to be treated.
The compound described herein useful in cancer treatment and prevention may be administered in combination with an anti-neoplastic agent. An anti-neoplastic agent refers to a compound that inhibits tumor growth. Exemplary anti-neoplastic agents include Fluorouracil; 5-fluoro-2,4(1H, 3H)-pyrimidinedione (5-FU), taxol, cisplatin, mitomycin C, tegafur, raltitrexed, capecitabine, and irinotecan (Arango et al., Cancer Research 61, 2001 4910-4915). A compound administered in combination with an anti-neoplastic agent does not necessarily require that the compound and the anti-neoplastic agent be administered concurrently. The compound and the agent may be administered separately as long as at a time point, they both have effects on same cancer cells.
In a further related aspect, the present invention provides methods for promoting apoptosis in cancer cells. Such methods comprise the step of contacting cancer cells with a compound described herein in an amount effective to promote apoptosis in these cells. A compound promotes apoptosis if the number of cancer cells undergoing apoptosis is statistically significantly larger in the presence of the compound than that in the absence of the compound. Such compounds may be identified by methods known in the art (e.g., measuring caspase activities and/or cell death) using cultured cancer cell lines, xenografts, or animal cancer models. Preferably, the compound is more active in promoting apoptosis in cancer cells than in normal cells. Cancer cells treatable by the present method may be from various tissue origins.
In another aspect of the present invention, a method for treating a disorder modulated by Wnt signaling pathway in which the method comprises administering to a patient a safe and effective amount of the compounds described herein. Pharmaceutical composition containing the compound of the present invention can be also used for this purpose. In this connection, it is found in the present invention that the compounds or pharmaceutical composition described herein can be useful for the treatment of disorder modulated by TCF4-β catenin-CBP complex, which is believed to be responsible for initiating the overexpression of cancer cells related to Wnt signaling pathway. Thus, it is another aspect of the present invention to provide a method for the treatment of disorder modulated by TCF4-β catenin-CBP complex, using the compounds described herein.
The present invention also provides compounds and methods for inhibiting survivin expression. Survivin is a target gene of the TCF/beta-catenin pathway, and more specifically is a target gene of the TCF/beta-catenin/CBP pathway. It is a member of the IAP (Inhibitor of Apoptosis Protein) family of proteins. Biological activity associated with survivin includes: highly expressed at G2/M, regulating cell cycle entry and exit; associated with microtubule, centrosomes, centromeres and midbody depending upon the phases of the cell cycle; and anti-apoptosis via interacting directly or indirectly with caspases (e.g., caspase 3, 7 and 9). In connection with cancer, survivin is widely and highly expressed in tumor cells, but expressed to little or no extent in normal tissue cells. Also, it has been observed that cancer patients whose tumors expressed survivin had a decreased overall survival. Furthermore, the degree of survivin expression has been correlated with other cancer markers, e.g., Ki67, PNCA, p53, APC, etc.
The effect of a particular compound of the present invention on survivin expression may be characterized by methods known in the art. Such methods include methods for characterizing survivin expression at the transcriptional or translational level. Exemplary methods for characterizing survivin expression at the transcriptional level are: cDNA microarray, reverse transcription-polymerase chain reaction (RT-PCR), chromatin immunoprecipitation (ChIP), and assays for reporter activities driven by survivin promoter. Exemplary methods for characterizing survivin expression at the translational level are: Western blot analysis, immunochemistry and caspase activities. Detailed descriptions of the above exemplary methods may be found in the examples below.
As described above, the present invention provides methods for inhibiting survivin expression. Such methods comprise the step of contacting a survivin-expressing cell with a compound of the present invention in an amount effective to inhibit survivin expression. A compound inhibits survivin expression if survivin expression in a cell is decreased in the presence of the compound compared to survivin expression in the absence of the compound. Survivin-expressing cells include tumor cells that express, such as cells in or from lung cancer, breast cancer, stomach cancer, pancreatic cancer, liver cancer, uterus cancer, ovarian cancer, gliomas, melanoma, colorectal cancer, lymphoma and leukemia. The step of contacting the survivin-expressing cells with the compound may be performed in vitro, ex vivo, or in vivo. A compound useful in inhibiting survivin expression may be identified, and the effects of a particular compound of the present invention may be characterized, by appropriate methods known in the art, as described in detail above.
Compounds of the present invention have been shown to inhibit the expression of survivin. Blanc-Brude et al., Nat. Medicine 8:987 (2002), have shown that survivin is a critical regulator of smooth muscle cell apoptosis which is important in pathological vessel-wall remodeling. Accordingly, another aspect of the present invention provides a method of treating or preventing (i.e., reducing the risk of) restenosis associated with angioplasty comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. In one embodiment the invention treats the restenosis, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having restenosis achieves a reduction in the severity, extent, or degree, etc. of the restenosis. In another embodiment the invention prevents (i.e., reduces the risk of) the restenosis, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional restenosis achieves a reduction in the anticipated severity, extent, or degree, etc. of the restenosis. Optionally, the subject is a mammalian subject.
Compounds of the present invention have been shown to inhibit TCF/B-catenin transcription. Rodova et al., J. Biol. Chem. 277:29577 (2002), have shown that PKD-1 promoter is a target of the B-catenin/TCF pathway. Accordingly, another aspect of the present invention provides a method of treating or preventing (i.e., reducing the risk of) polycystic kidney disease comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. In one embodiment the invention treats the polycystic kidney disease, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having polycystic kidney disease achieves a reduction in the severity, extent, or degree, etc. of the polycystic kidney disease. In another embodiment the invention prevents (i.e., reduces the risk of) polycystic kidney disease, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional polycystic kidney disease achieves a reduction in the anticipated severity, extent, or degree, etc. of the polycystic kidney disease. Optionally, the subject is a mammalian subject.
Compounds of the present invention have been shown to inhibit the expression of Wnt signaling. Hanai et al., J. Cell Bio. 158:529 (2002), have shown that endostatin, a known anti-angiogenic factor, inhibits Wnt signaling. Accordingly, another aspect of the present invention provides a method of treating or preventing (i.e., reducing the risk of) aberrant angiogenesis disease comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. In one embodiment the invention treats the aberrant angiogenesis disease, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having aberrant angiogenesis disease achieves a reduction in the severity, extent, or degree, etc. of the aberrant angiogenesis disease. In another embodiment, the invention prevents (i.e., reduces the risk of) aberrant angiogenesis disease, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional aberrant angiogenesis disease achieves a reduction in the anticipated severity, extent, or degree, etc. of the aberrant angiogenesis disease. Optionally, the subject is a mammalian subject.
Compounds of the present invention have been shown to inhibit the expression of Wnt signalling. Sen et al., P.N.A.S. (USA) 97:2791 (2000), have shown that mammals with rheumatoid arthritis demonstrate increased expression of Wnt and Fz in RA synovial tissue. Accordingly, another aspect of the present invention provides a method of treating or preventing (i.e., reducing the risk of) rheumatoid arthritis disease comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. In one embodiment the invention treats the rheumatoid arthritis disease, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having rheumatoid arthritis disease achieves a reduction in the severity, extent, or degree, etc. of the rheumatoid arthritis disease. In another embodiment the invention prevents (i.e., reduces the risk of) rheumatoid arthritis disease, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional rheumatoid arthritis disease achieves a reduction in the anticipated severity, extent, or degree, etc. of the rheumatoid arthritis disease. Optionally, the subject is a mammalian subject.
Compounds of the present invention have been shown to inhibit the expression of Wnt signalling. Uthoff et al., Int. J. Oncol. 19:803 (2001), have shown that differential upregulation of disheveled and fz (Wnt pathway molecules) occurs in ulcerative colitis (compared to Chron's disease patients). Accordingly, another aspect of the present invention provides a method of treating or preventing (i.e., reducing the risk of) ulcerative colitis comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. In one embodiment the invention treats the ulcerative colitis, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having ulcerative colitis achieves a reduction in the severity, extent, or degree, etc. of the ulcerative colitis. In another embodiment the invention prevents (i.e., reduces the risk of) ulcerative colitis, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional ulcerative colitis achieves a reduction in the anticipated severity, extent, or degree, etc. of the ulcerative colitis. Optionally, the subject is a mammalian subject.
Compounds of the present invention have been shown to inhibit Wnt TCF/catenin signalling. Accordingly, another aspect of the invention provides a method of treating or preventing (i.e., reducing the risk of) tuberous sclerosis complex (TSC) comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. Subjects having TSC typically develop multiple focal lesions in the brain, heart, kidney and other tissues (see, e.g., Gomez, M. R. Brain Dev. 17(suppl): 55-57 (1995)). Studies in mammalian cells have shown that overexpression of TSC1 (which expresses hamartin) and TSC2 (which expresses tuberin) negatively regulates cell proliferation and induces G1/S arrest (see, e.g., Miloloza, A. et al., Hum. Mol. Genet. 9: 1721-1727 (2000)). Other studies have shown that hamartin and tuberin function at the level of the β-catenin degradation complex, and more specifically that these proteins negatively regulate beta-catenin stability and activity by participating in the beta-catenin degradation complex (see, e.g., Mak, B. C., et al. J. Biol. Chem. 278(8): 5947-5951, (2003)). Beta-catenin is a 95-kDa protein that participates in cell adhesion through its association with members of the membrane-bound cadherin family, and in cell proliferation and differentiation as a key component of the Wnt/Wingless pathway (see, e.g., Daniels, D. L., et al., Trends Biochem. Sci. 26: 672-678 (2001)). Misregulation of this pathway has been shown to be oncogenic in humans and rodents. The present invention provides compounds that modulate β-catenin activity, and particularly its interactions with other proteins, and accordingly may be used in the treatment of TSC. Thus, in one embodiment the invention treats TSC, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having TSC achieves a reduction in the severity, extent, or degree, etc. of the TSC. In another embodiment the invention prevents (i.e., reduces the risk of) TSC, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional TSC achieves a reduction in the anticipated severity, extent, or degree, etc. of the TSC. Optionally, the subject is a mammalian subject.
Compounds of the present invention have been shown to inhibit the expression of Wnt signalling. The Kaposi's sarcoma-associated herpesvirus (KSHV) latency-associated nuclear antigen (LANA) is expressed in all KSHV-associated tumors, including Kaposi's sarcoma (KS) and β-cell malignancies such as primary effusion lymphoma (PEL) and multicentric Castleman's disease. Fujimuro, M. et al., Nature Medicine 9(3):300-306 (2003), have shown that LANA acts to stabilize β-catenin, apparently by redistribution of the negative regular GSK-3 β. The present invention provides compounds and methods for inhibiting β-catenin protein interactions, e.g., β-catenin/TCF complex formation. Thus, the compounds of the present invention thwart the LANA-induced accumulation of β-catenin/TCF complex and, at least in part, the consequences of KSHV infection. Accordingly, another aspect of the present invention provides a method of treating or preventing (i.e., reducing the risk of) conditions due to infection by Karposi's sarcoma-associated herpesvirus (KSHV). Such conditions include KSHV-associated tumors, including Kaposi's sarcoma (KS) and primary effusion lymphoma (PEL). The method comprises administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention. In one embodiment the invention treats the KSHV-associated tumor, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject having a KSHV-associated tumor achieves a reduction in the severity, extent, or degree, etc. of the tumor. In another embodiment the invention prevents (i.e., reduces the risk of) a KSHV-associated tumor, i.e., administration of a reverse-turn mimetic or prodrug of the present invention to a subject that is anticipated to develop new or additional KSHV-associated tumors achieves a reduction in the anticipated severity, extent, or degree, etc. of the tumor. Optionally, the subject is a mammalian subject.
LEF/TCF DNA-binding proteins act in concert with activated β-catenin (the product of Wnt signaling) to transactivate downstream target genes. DasGupta, R. and Fuchs, E. Development 126(20):4557-68 (1999) demonstrated the importance of activated LEF/TCF complexes at distinct times in hair development and cycling when changes in cell fate and differentiation commitments take place. Furthermore, in skin morphogenesis, β-catenin has been shown to be essential for hair follicle formation, its overexpression causing the “furry” phenotype in mice (Gat, U., et al. Cell 95:605-614 (1998) and Fuchs, E. Harvey Lect. 94:47-48 (1999). See also Xia, X. et al. Proc. Natl. Acad. Sci. USA 98:10863-10868 (2001). Compounds of the present invention have been shown to inhibit the expression of Wnt signaling, and interfere with formation of β-catenin complexes. Accordingly, the present invention provides a method for modulating hair growth comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention, where the amount is effective to modulate hair growth in the subject. Optionally, the subject is a mammalian subject.
The present invention provides compounds useful in treating or preventing (i.e., reducing the risk of) Alzheimer's disease. Alzheimer's disease (AD) is a neurodegenerative disease with progressive dementia. This disease is accompanied by three main structural changes in the brain, namely, i) intracellular protein deposits (also known as neurofibrillary tangles, or NFT), ii) extracellular protein deposits termed amyloid plaques that are surrounded by dystrophic neuritis, and iii) diffuse loss of neurons.
The compounds or compositions of the present invention rescue defects in neuronal differentiation caused by a presenilin-1 mutation and may decrease the number, or rate at which neuronal precursor populations differentiate to neurons in Alzheimer's brains. Presenilins are transmembrane proteins whose functions are related to trafficking, turnover and cleavage of Notch and Amyloid Precursor Protein. Missense mutations in presenilin 1 (PS-1) are associated with early-onset familial Alzheimer's disease (Fraser et al., Biochem. Soc. Symp. 67, 89 (2001)). The compounds of the present invention may be applicable not only to individuals with PS-1 familial Alzheimer's mutations, but also to general Alzheimer's patients.
In addition, the present invention provides a method for treating or preventing Alzheimer's disease comprising administering to a subject in need thereof a safe and effective amount of a reverse-turn mimetic or prodrug of the present invention, where the amount is effective to treat or prevent (i.e., reduce the risk of) Alzheimer's disease in the subject. Treating Alzheimer's disease is understood to encompass reducing or eliminating the manifestation of symptoms characteristic of Alzheimer's disease, or delaying the progression of this disease. Preventing Alzheimer's disease is understood to encompass preventing or delaying the onset of this disease.
A subject in need of treatment may be a human or non-human primate or other animal that is at various stages of Alzheimer's disease. Methods for diagnosing Alzheimer's disease are known in the art (see, e.g., Dinsmore, J. Am. Osteopath. Assoc. 99(9 Suppl.):S1-6, 1999; Kurz et al., J. Neural Transm. Suppl. 62: 127-33, 2002; Storey et al., Front Viosci. 7: e155-84, 2002; Marin et al., Geriatrics 57: 36-40, 2002; Kril and Halliday, Int. Rev. Neurobiol. 48: 167-217, 2001; Gurwitz, Trends Neurosci. 23: 386, 2000; Muller-Spahn and Hock, Eur. Arch. Psychiatry Clin. Neurosci. 249 Suppl. 3: 37-42; Fox and Rossor, Rev. Neuro. (Paris) 155 Suppl. 4: S33-7, 1999), including the use of neuropsychological measures, functional imaging measures, biological markers, and autopsy of brain tissue. A subject in need of prevention (i.e., reduction of risk) may be a human or non-human primate or other animal that is at risk for developing Alzheimer's disease, such as an individual having a mutation of certain genes responsible for this disease (e.g., genes encoding amyloid precursor protein, presenilin 1, and presenilin 2), and/or a gene involved in the pathogenesis of this disease (e.g., apolipoprotein E gene) (Rocchi et al., Brain Res. Bull. 61: 1-24, 2003).
Compounds with structures as set forth in formula (I) may be screened for their activities in treating or preventing Alzheimer's disease by any appropriate methods known in the art. Such screening may be initially performed using in vitro cultured cells (e.g, PC-12 cells as described in Example 8). Compounds capable of rescuing defects in neuronal differentiation caused by a presenilin 1 mutation may be further screened using various animal models for Alzheimer's disease. Alternatively, compounds with structures as set forth in formula (I) may be directedly tested in animal models for Alzheimer's disease. Many model systems are known in the art and may be used in the present invention (see, e.g., Rowan et al., Philos. Trans. R. Soc. Lond. B. Biol. Sci. 358: 821-8, 2003; Lemere et al., Neurochem. Res. 28: 1017-27, 2003; Sant'Angelo et al., Neurochem. Res. 28: 1009-15, 2003; Weiner Harv. Rev. Psychiatry 4: 306-16, 1997). The effects of the selected compounds on treating or preventing Alzheimer's disease may be characterized or monitored by methods known in the art for evaluating the progress of Alzheimer's disease, including those described above for diagnosing this disease.
The present invention also provides methods for promoting neurite outgrowth. Such methods comprise the step of contacting a neuron with a compound described herein in an amount effective to promote neurite outgrowth. These methods are useful in treating neurodegenerative diseases (e.g., glaucoma, macular degeneration, Parkinson's Disease, and Alzheimer's disease) and injuries to nervous system. A compound promotes neurite outgrowth if the neurite lengths of neurons are statistically significantly longer in the presence of the compound than those in the absence of the compound. Such a compound may be identified using in vitro cultured cells (e.g., PC-12 cells, neuroblastoma B104 cell) (Bitar et al., Cell Tissue Res. 298: 233-42, 1999; Pellitteri et al., Eur. J. Histochem. 45: 367-76, 2001; Satoh et al., Biochem. Biophys. Res. Commun. 258: 50-3, 1999; Hirata and Fujisawa, J. Neurobiol. 32:415-25, 1997; Chauvet et al., Glia 18: 211-23, 1996; Vetter and Bishop, Curr. Biol. 5: 168-78, 1994; Koo et al., Proc. Natl. Acad. Sci. USA 90: 4748-52, 1993; Skubitz et al., J. Cell Biol. 115: 1137-48, 1991; O'Shea et al., Neuron 7: 231-7, 1991; Rydel and Greene, Proc. Natl. Acad. Sci. USA 85: 1257-61, 1988) or using explants (Kato et al., Brain Res. 31: 143-7, 1983; Vanhems et al., Eur. J. Neurosci. 2: 776-82, 1990; Carri et al., Int. J. Dev. Neurosci. 12: 567-78, 1994). Contacting a neuron with a compound according to the present invention may be carried out in vitro or in vivo. The resulting treated neuron, if generated in vitro, may be transplanted into a tissue in need thereof (Lacza et al., Brain Res. Brain Res. Protoc. 11: 145-54, 2003; Chu et al., Neurosci. Lett 343: 129-33, 2003; Fukunaga et al., Cell Transplant 8: 435-41, 1999).
The present invention also provides methods for promoting differentiation of a neural stem cell comprising contacting a neural stem cell with a compound described herein in an amount effective to promote differentiation of a neural stem cell. Such methods are also useful in treating neurodegenerative diseases (e.g., glaucoma, macular degeneration, Parkinson's Disease, and Alzheimer's disease) and injuries to nervous system. “Neural stem cell” refers to a clonogenic, undifferentiated, multipotent cell capable of differentiating into a neuron, an astrocyte or an oligodendrocyte under appropriate conditions. A compound promotes differentiation of neural stem cells if neural stem cells exhibit a statistically significantly higher degree of differentiation in the presence of the compound than in the absence of the compound. Such a compound may be identified using assays involving in vitro cultured stem cells or animal models (Albranches et al., Biotechnol. Lett. 25: 725-30, 2003; Deng et al., Exp. Neurol. 182: 373-82, 2003; Munoz-Elias et al., Stem Cells 21: 437-48, 2003; Kudo et al., Biochem. Pharmacol. 66: 289-95, 2003; Wan et al., Chin. Med. J. 116: 428-31, 2003; Kawamorita et al., Hum. Cell 15: 178-82, 2002; Stavridis and Smith, Biochem. Soc. Trans. 31:45-9, 2003; Pachernik et al., Reprod. Nutr. Dev. 42: 317-26, 2002; Fukunaga et al., supra). The neural stem cell may be a cultured stem cell, a stem cell freshly isolated from its source tissue, or a stem cell within its source organism. Thus, contacting the neural stem cell with a compound according to the present invention may be carried out either in vitro (for a cultured or freshly isolated stem cell) or in vivo (for a stem cell within its source organism). The resulting differentiated neural cell, if generated in vitro, may be transplanted into a tissue in need thereof (Lacza et al., supra; Chu et al., supra; Fukunaga et al., supra). Such a tissue includes a brain tissue or other nervous tissue that suffers from a trauma or a neurodegenerative disease.
In certain embodiments, the methods for promoting differentiation of a neural stem cell comprising contacting a neural stem cell with a compound described herein in an amount effective to promote neurite outgrowth as described in more detail above.
The following non-limiting examples illustrate the compounds, compositions, and methods of use of this invention.
2 L, two-neck, round-bottomed-flask was fitted with a glass stopper and a calcium tube. A solution of methylhydrazine sulfate (20 g, 139 mmol, where R3 is methyl) in THF (300 mL) was added and a solution of DiBoc (33 g, 153 mmol) in THF was added. Saturated sodium bicarbonate aqueous solution (500 mL) was added dropwise via addition funnel over 2 hours with vigorous stirring. After 6 hours, a solution of Fmoc-Cl (39 g, 153 mmol) in THF was added slowly. The resulting suspension was stirred for 6 hours at 0° C. The mixture was extracted with ethyl acetate (EA, 500 mL) and the organic layer was retained. The solution was dried with sodium sulfate and evaporated in vacuo. The next step proceeded without purification.
A 1 L, two-necked, round-bottom-flask was fitted with a glass stopper and a calcium tube. A solution of the product from the previous step in MeOH (300 mL) was added and conc. HCl (30 mL, 12 N) was added slowly via addition funnel with magnetic stirring in ice water bath and stirred overnight. The mixture was extracted with EA (1000 mL) and the organic layer was retained. The solution was dried with sodium sulfate and evaporated in vacuo. The residue was purified by recrystallization with n-hexane and EA to give N-Fmoc-N′-methyl hydrazine (32.2 g, 83%). 1HNMR (DMSO-D6) δ 7.90˜7.88 (d, J=6 Hz, 2H), δ 7.73˜7.70 (d, J=9 Hz, 2H), 7.44˜7.31 (m, 4H), 4.52˜4.50 (d, J=6 Hz, 2H), 4.31˜4.26 (t, J=6 Hz, 1H), 2.69 (s, 1H).
1 L, two-necked, round-bottom-flask was fitted with a glass stopper and reflux condenser connected to a calcium tube. A solution of N-Fmoc-N′-methyl hydrazine (20 g, 75 mmol) in toluene (300 mL) was added. A solution of t-butylbromo acetate (22 g, 111 mmol) in toluene (50 mL) was added slowly. Cs2CO3 (49 g, 149 mmol) was added slowly. NaI (11 g, 74 mmol) was added slowly with vigorous stirring. The reaction mixture was stirred at reflux temperature over 1 day. The product mixture was filtered and extracted with EA (500 mL). The solution was dried over sodium sulfate and evaporated in vacuo. The product was purified by chromatography with hexane:EA=2:1 solution to give (N-Fmoc-N′-methyl-hydrazino)-acetic acid t-butyl ester (19.8 g, 70%).
1H-NMR (CDCl3-d) δ 7.78˜7.75 (d, J=9 Hz, 2H), δ 7.61-7.59 (d, J=6 Hz, 2H), 7.43˜7.26 (m, 4H), 4.42˜4.40 (d, J=6 Hz, 2H), 4.23 (b, 1H), 3.57 (s, 2H), 2.78 (s, 3H), 1.50 (s, 9H).
1 L, two-neck, round-bottomed-flask was fitted with a glass stopper and reflux condenser connected to a calcium tube. (N-Fmoc-N′-methyl-hydrazino)-acetic acid t-butyl ester (20 g, 52 mmol) was added. A solution of HCl (150 mL, 4 M solution in dioxane) was added slowly with vigorous stirring in an ice water bath. The reaction mixture was stirred at RT over 1 day. The solution was concentrated completely under reduced pressure at 40° C. A saturated aq. NaHCO3 solution (100 mL) was added and the aqueous layer was washed with diethyl ether (100 mL). Conc. HCl was added dropwise slowly at 0° C. (pH 2-3). The mixture was extracted and the organic layer was retained (500 mL, MC). The solution was dried with sodium sulfate and evaporated in vacuo. The residue was purified by recrystallization with n-hexane and ethyl acetate to give (N-Fmoc-N′-methyl-hydrazino)-acetic acid (12 g, 72%). 1H-NMR (DMSO-d6) δ 12.38 (s, 1H), 8.56 (b, 1H), 7.89˜7.86 (d, J=9 Hz, 2H), 7.70˜7.67 (d, J=9 Hz, 2H), 7.43˜7.29 (m, 4H), 4.29˜4.27 (d, J=6 Hz, 2H), 4.25˜4.20 (t, J=6 Hz, 1H), 3.47 (s, 2H), 2.56 (s, 3H).
MOC—NH—NH2 (50 g, 0.55 mol) was dissolved in DMF (300 ml), and then ethyl bromoacetate (68 ml, 0.555 mol) and potassium carbonate (77 g, 0.555 mol) were added to the reaction vessel. The mixture was warmed to 50° C. for 5 hours. After the reaction was completed, the mixture was filtered, and diluted with EtOAc, and washed with brine (3 times). The crude product was purified by column (eluent: Hex/EtOAc=4/1) to provide 72 of colorless oil.
The ethyl ester (10 g, 0.05 mol), potassium carbonate (6.9 g, 0.05 mol), and R7-bromide (14.1 g, 0.06 mol) were dissolved in DMF (200 ml), and The mixture was warmed to 50° C. for 5 hours. After the reaction was completed, the mixture was filtered, and diluted with EA, and washed with brine (3 times). The crude product was purified by Chromatography (eluent: Hex/EtOAc=4/1).
The alkylated ethyl ester (9.5 g, 0.03 mol) was dissolved in THF/water (1/1, ml), and added 2N NaOH (28.3 ml) solution at 0° C. The mixture was stirred at RT for 2 hours. After the starting ester was not detected on UV, the solution was diluted with EA, then separated. The aqueous layer was acidified to pH 3˜4 by 1N HCl, and the compound was extracted by DCM (3 times). The combined organic layer was dried over MgSO4, and evaporated to give a yellow solid.
To a solution of Benzaldehyde (1.27 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.75 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (816 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of Benzyl-(2,2-diethoxy-ethyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and Ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to give [1-[Benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (4.3 g, 2 step yield: 62%). MS ESI 577 (M+H)
To a solution of [1-[Benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (3.32 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford 2-Amino-N-benzyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide, which was used next step without further purification.
To a solution of 2-Amino-N-benzyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide in CH2Cl2 (50 ml) was added a solution of (3R)-3-(3-Benzyl-ureido)-hex-5-enoic acid (1.6 g, 6.1 mmol), EDCI (1.17 g, 7.3 mmol, 1.2 eq), HOBt (0.93 g, 7.3 mmol, 1.2 eq), DIEA (2.13 mL, 12.2 mmol, 2.4 eq) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 687 (M+H), 709 (M+Na)
A solution of crude 3-(3-Benzyl-ureido)-hex-5-enoic acid [1-[benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-amide (2.9 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and Hexane to give the 2-Allyl-8-benzyl-6-(4-hydroxy-benzyl)-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.18 g, 3 step yield: 38%). 1H NMR (CDCl3, 300 MHz) δ 7.5˜7.26 (m, 5H), 7.25 (d, J=7.01, 2H), 6.85 (m, 5H), 6.55 (d, J=8.76, 2H), 5.7 (m, 1H), 5.3 (t, J=4.7, 1H), 5.05 (d, J=10.75, 1H), 5.0 (d, J=18.54, 1H), 4.87 (d, J=14.51, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H, OH), 3.5˜3.3 (m, 2H), 3.25-3.1 (m, 2H), 2.6˜2.4 (m, 2H), 2.2 (t, J=7.2, 2H) MS ESI 539 (M+H), 561 (M+Na).
To a solution of Benzaldehyde (1.27 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.75 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (816 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of Benzyl-(2,2-diethoxy-ethyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to give [1-[Benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (4.3 g, 2 step yield: 69%). MS ESI 577 (M+H)
To a solution of [1-[Benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (3.32 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford 2-Amino-N-benzyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide, which was used next step without further purification.
To a solution of 2-Amino-N-benzyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide in CH2Cl2 (50 ml) was added a solution of (3R)-3-(3-Benzyl-ureido)-butyric acid (1.44 g, 6.1 mmol), EDCI (1.17 g, 1.2 eq), HOBt (0.93 g, 1.2 eq), DIEA (2.13 mL, 12.2 mmol) in CH2Cl2 (100 ml) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 661 (M+H), 683 (M+Na)
A solution of crude 3-(3-Benzyl-ureido)-hex-5-enoic acid [1-[benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-amine (3.26 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give the 8-Benzyl-6-(4-hydroxy-benzyl)-2-methyl-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.12 g, 3 step yield: 38%). 1H NMR (CDCl3, 300 MHz) δ 7.5˜7.3 (m, 5H), 7.2 (d, J=7.01, 2H), 6.80 (m, 5H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H, OH), 3.5˜3.3 (m, 2H), 3.25-3.1 (m, 2H), 2.2 (t, J=7.2, 2H) 1.36 (m, 3H) MS ESI 513 (M+H), 535 (M+Na).
To a solution of 2,3-dimethoxybenzaldehyde (2 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.49 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (829 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of 2-Allyl-8-(2,3-dimethoxy-benzyl)-6-(4-hydroxy-benzyl)-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to gave the compound (4.3 g, 2 step yield: 69%). MS ESI 730.50 (100% M+H)
To a solution of {2-(4-tert-Butoxy-phenyl)-1-[(2,2-diethoxy-ethyl)-2,3-dimethoxy-benzyl]-carbamoyl}-ethyl}-carbamic acid benzyl ester (3.67 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford the 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy)-N-(2,3-dimethoxy-benzyl)-propionamide which was used next step without further purification.
To a solution of 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy)-N-(2,3-dimethoxy-benzyl)-propionamide in CH2Cl2 (50 ml) was added a solution of 3-(3-Benzyl-ureido)-hex-5-enoic acid (1.6 g, 6.1 mmol), EDCI (1.17 g, 1.2 eq), HOBt (0.93 g, 1.2 eq), DIEA (2.13 mL, 12.2 mL) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 747.65 (80% M+H), 769.45 (30% M+Na)
A solution of crude 3-(3-Benzyl-ureido)-hex-5-enoic acid {2-(4-tert-butoxy-phenyl)-1-[(2,2,-diethoxy-ethyl)-(2,3-dimethoxy-benzyl)-carbamoyl]-ethyl}-amide (3.7 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give the 2-Allyl-8-(2,3-dimethoxy-benzyl)-6-(4-hydroxy-benzyl)-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic benzylamide (1.3 g, 3 step yield: 38%). 1H NMR (CDCl3, 300 MHz) δ 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.85 (m, 3H), 6.8 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 5.05 (d, J=10.75, 1H), 5.0 (d, J=18.54, 1H), 4.87 (d, J=14.51, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H, OH), 3.82 (s, 3H), 3.66 (s, 3H), 3.5˜3.3 (m, 2H), 3.25˜3.1 (m, 2H), 2.6˜2.4 (m, 2H), 2.2 (t, J=7.2, 2H) MS ESI 599.32 (M+H), 621.38 (M+Na), 637.19 (M+K)
To a solution of 2,3-dimethoxybenzaldehyde (2 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.49 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (829 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of (2,2-Diethoxy-ethyl)-(2,3-dimethoxy-benzyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to gave the compound (4.3 g, 2 step yield: 69%). MS ESI 730.50 (M+H)
To a solution of {2-(4-tert-Butoxy-phenyl)-1-[(2,2-diethoxy-ethyl)-2,3-dimethoxy-benzyl]-carbamoyl}-ethyl}-carbamic acid benzyl ester (3.67 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford the 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy)-N-(2,3-dimethoxy-benzyl)-propionamide which was used next step without further purification.
To a solution of 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy)-N-(2,3-dimethoxy-benzyl)-propionamide in CH2Cl2(50 mL) was added a solution of (3R)-3-(3-Benzyl-ureido)-butyric acid (1.44 g, 6.1 mmol), EDCI (1.17 g, 1.2 eq), HOBt (0.93 g, 1.2 eq), DIEA (2.13 mL, 12.2 mmol) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 721 (M+H), 743 (M+Na)
A solution of crude 3-(3-Benzyl-ureido)-N-{2-(4-tert-butoxy-phenyl)-1-[(2,2,-diethoxy-ethyl)-(2,3-dimethoxy-benzyl)-carbamoyl]-ethyl}-butyramide (3.56 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give the 8-(2,3-Dimethoxy-benzyl)-6-(4-hydroxy-benzyl)-2-methyl-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.32 g, 3 step yield: 40%). 1H NMR (CDCl3, 300 MHz) δ 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.85 (m, 3H), 6.8 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H, OH), 3.82 (s, 3H), 3.66 (s, 3H), 3.5˜3.3 (m, 2H), 3.25˜3.1 (m, 2H), 2.2 (t, J=7.2, 2H) 1.45 (m, 3H) MS ESI 573 (M+H), 595 (M+Na).
To a solution of 1H-Indazole-7-carbaldehyde (1.75 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.74 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (816 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of (2,2-Diethoxy-ethyl)-(1H-indazol-7-ylmethyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to gave {2-(4-tert-Butoxy-phenyl)-1-[(2,2-diethoxy-ethyl)-(1H-indazol-7-ylmethyl)-carbamoyl]-ethyl}-carbamic acid benzyl ester (5.1 g, 2 step yield: 69%). MS ESI 617 (M+H)
To a solution of [1-[Benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (3.54 g, 5.76 mmol) in MeOH (50 ml) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-N-(1H-indazol-7-ylmethyl)-propionamide, which was used next step without further purification.
To a solution of 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-N-(1H-indazol-7-ylmethyl)-propionamide in CH2Cl2 (50 mL) was added a solution of (3R)-3-(3-Benzyl-ureido)-hex-5-enoic acid (1.6 g, 6.1 mmol), EDCI (1.17 g, 1.2 eq), HOBt (0.93 g, 1.2 eq), DIEA (2.13 mL, 12.2 mmol) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 727 (M+H), 749 (M+Na)
A solution of crude 3-(3-Benzyl-ureido)-hex-5-enoic acid {2-(4-tert-butoxy-phenyl)-1-[(2,2-diethoxy-ethyl)-(1H-indazol-7-ylmethyl)-carbamoyl]-ethyl}-amide (3.60 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give the 2-Allyl-6-(4-hydroxy-benzyl)-8-(1H-indazol-7-ylmethyl)-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.0 g, 3 step yield: 30%). 1H NMR (CDCl3, 300 MHz) δ 8.20 (s, 1H), 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.80 (m, 3H), 6.75 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 5.05 (d, J=10.75, 1H), 5.0 (d, J=18.54, 1H), 4.87 (d, J=14.51, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H), 3.5˜3.3 (m, 2H), 3.25˜3.1 (m, 2H), 2.6˜2.4 (m, 2H), 2.2 (t, J=7.2, 2H) MS ESI 579 (M+H), 601 (M+Na).
To a solution of 1H-Indazole-7-carbaldehyde (1.75 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.74 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (816 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of (2,2-Diethoxy-ethyl)-(1H-indazol-7-ylmethyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to give {2-(4-tert-Butoxy-phenyl)-1-[(2,2-diethoxy-ethyl)-(1H-indazol-7-ylmethyl)-carbamoyl]-ethyl}-carbamic acid benzyl ester (5.1 g, 2 step yield: 69%). MS ESI 617 (M+H).
To a solution of [1-[Benzyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (3.54 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-N-(1H-indazol-7-ylmethyl)-propionamide which was used next step without further purification.
To a solution of 2-Amino-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-N-(1H-indazol-7-ylmethyl)-propionamide in CH2Cl2 (50 mL) was added a solution of (3R)-3-(3-Benzyl-ureido)-butyric acid (1.44 g, 6.1 mmol), EDCI (1.17 g, 1.2 eq), HOBt (0.93 g, 1.2 eq), DIEA (2.13 mL, 12.2 mmol) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 701 (M+H), 723 (M+Na).
A solution of crude 3-(3-Benzyl-ureido)-N-{2-(4-tert-butoxy-phenyl)-1-[(2,2-diethoxy-ethyl)-(1H-indazol-7-ylmethyl)-carbamoyl]-ethyl}-butyramide (3.46 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give the 6-(4-Hydroxy-benzyl)-8-(1H-indazol-7-ylmethyl)-2-methyl-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (0.923 g, 3 step yield: 29%). 1H NMR (CDCl3, 300 MHz) δ 8.30 (s, 1H), 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.85 (m, 3H), 6.8 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H), 3.5˜3.3 (m, 2H), 3.25-3.1 (m, 2H), 2.2 (t, J=7.2, 2H) 1.45 (m, 3H) MS ESI 553 (M+H), 575 (M+Na).
To a solution of Benzothiazole-4-carbaldehyde (1.96 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.74 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (816 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and Ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to give [1-[Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (5.32 g, 2 step Yield: 70%). MS ESI 634 (M+H)
To a solution of [1-[Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (3.64 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford 2-Amino-N-benzothiazol-4-ylmethyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide which was used next step without further purification.
To a solution of 2-Amino-N-benzothiazol-4-ylmethyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide in CH2Cl2 (50 mL) was added a solution of (3R)-3-(3-Benzyl-ureido)-hex-5-enoic acid (1.6 g, 6.1 mmol), EDCI (1.17 g, 1.2 eq), HOBt (0.93 g, 1.2 eq), DIEA (2.13 mL, 12.2 mL) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 744 (M+H), 766 (M+Na)
A solution of crude 3-(3-Benzyl-ureido)-hex-5-enoic acid [1-[benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-amide (3.67 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give 2-Allyl-8-benzothiazol-4-ylmethyl-6-(4-hydroxy-benzyl)-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.2 g, 3 step yield: 35%). 1H NMR (CDCl3, 300 MHz) δ 9.20 (s, 1H), 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.80 (m, 3H), 6.75 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 5.05 (d, J=10.75, 1H), 5.0 (d, J=18.54, 1H), 4.87 (d, J=14.51, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H), 3.5˜3.3 (m, 2H), 3.25˜3.1 (m, 2H), 2.6˜2.4 (m, 2H), 2.2 (t, J=7.2, 2H) MS ESI 596 (M+H), 618 (M+Na).
To a solution of Benzothiazole-4-carbaldehyde (1.96 g, 12 mmol) in MeOH (50 mL) was added aminoacetaldehyde diethyl acetal (1.74 mL, 12 mmol) and acetic acid (1.03 mL, 18 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was added to a stirred solution of sodium cyanoborohydride (816 mg, 13 mmol). The reaction mixture was stirred at room temperature for 12 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was used next step without further purification.
To a solution of Cbz-Try(OtBu)-OH (6.63 g, 12 mmol) in MC/DMF (9/1, 100 mL) was added HATU (4.56 g), and DIEA (4.2 mL). The reaction mixture was stirred at room temperature for 30 min. The reaction mixture was added to a stirred solution of Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-amine. The reaction mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure. Then H2O and ethyl acetate were added to the reaction mixture. The organic layer was washed with H2O and brine, dried over Na2SO4, and concentrated under reduced pressure. The crude compound was purified by chromatography to gave [1-[Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (5.32 g, 2 step yield: 70%). MS ESI 634 (M+H)
To a solution of [1-[Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-carbamic acid benzyl ester (3.64 g, 5.76 mmol) in MeOH (50 mL) was added Pd/C (500 mg). After 2 h of stirring under H2 atmosphere, the solution was filtered on Celite and the solvent was evaporated to afford 2-Amino-N-benzothiazol-4-ylmethyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide, which was used next step without further purification.
To a solution of 2-Amino-N-benzothiazol-4-ylmethyl-3-(4-tert-butoxy-phenyl)-N-(2,2-diethoxy-ethyl)-propionamide in CH2Cl2 (50 mL) was added a solution of (3R)-3-(3-Benzyl-ureido)-butyric acid (1.44 g, 6.1 mmol), EDCI (1.17 g, 7.32 mmol, 1.2 eq), HOBt (0.93 g, 7.32 mmol, 1.2 eq), DIEA (2.13 mL, 12.2 mmol, 2.4 eq) in CH2Cl2 (100 mL) stirred for 40 min. The reaction mixture was stirred at room temperature for 14 h, and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was used next step without further purification. MS ESI 718 (M+H), 740 (M+Na).
A solution of crude N-[1-[Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)-ethyl]-3-(3-benzyl-ureido)-butyramide (3.55 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give 8-Benzothiazol-4-ylmethyl-6-(4-hydroxy-benzyl)-2-methyl-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.05 g, 3 step yield: 32%). 1H NMR (CDCl3, 300 MHz) δ 9.25 (s, 1H), 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.85 (m, 3H), 6.8 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H), 3.5˜3.3 (m, 2H), 3.25˜3.1 (m, 2H), 2.2 (t, J=7.2, 2H) 1.45 (m, 3H) MS ESI 570 (M+H), 592 (M+Na).
This compound was prepared according to literature procedure. (Cheguillaume et. al., Synlett 2000, 3, 331)
Bromoacetal resin (60 mg, 0.98 mmol/g) and a solution of benzyl amine in DMSO (2.5 ml, 2 M) were placed in vial with screw cap. The reaction mixture was shaken at 60° C. using rotating oven [Robbins Scientific] for 12 hours. The resin was collected by filtration, and washed with DMF, then DCM, to provide a first component piece.
A solution of Fmoc-alanine (4 equiv., commercially available, the second component piece), HATU (PerSeptive Biosystems, 4 equiv.), and DIEA (4 equiv.) in NMP (Advanced ChemTech) was added to the resin. After the reaction mixture was shaken for 4 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
To the resin was added 20% piperidine in DMF. After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
A solution of Nβ-Moc-Nα-benzyl-hydrazinoglycine (4 equiv., compound (3) in preparative example 2, where R7 is benzyl, 3rd component piece), HOBT [Advanced ChemTech] (4 equiv.), and DIC (4 equiv.) in DMF was added to the resin prepared above. After the reaction mixture was shaken for 3 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then MeOH. The resin was dried in vacuo at room temperature.
The resin was treated with formic acid (2.5 ml) for 18 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under reduced pressure to give the product as an oil. 1H-NMR (400 MHz, CDCl3) δ ppm; 1.51 (d, 3H), 2.99 (m, 1H), 3.39 (d, 1H), 3.69 (m, 1H), 3.75 (m, 1H), 3.82 (s, 3H), 4.02 (d, 1H), 4.24 (d, 1H), 4.39 (d, 1H), 4.75 (d, 1H), 5.14 (q, 1H), 5.58 (dd, 1H), 7.10-7.38 (m, 10H).
An ice-cooled biphasic mixture of N-methyl hydrazine carboxylic acid 9H-fluoren-9-ylmethyl ester (107 mg, 0.4 mmol) in 15 ml of CH2Cl2 and 15 ml of saturated aq. NaHCO3 was rapidly stirred while 1.93 M phosgene in toluene (1.03 ml, 2 mmol) was added as a single portion. The reaction mixture was stirred for 30 min, the organic phase was collected, and the aqueous phase was extracted with CH2Cl2. The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo to afford 128 mg (97%) of carbamoyl chloride as a foamy solid. [Caution: Phosgene vapor is highly toxic. Use it in a hood]. This product was used for the following solid phase synthesis without further purification.
Bromoacetal resin (30 mg, 0.98 mmol/g) and a solution of benzyl amine in DMSO (1.5 ml, 2 M) were placed in vial with screw cap. The reaction mixture was shaken at 60° C. using rotating oven [Robbins Scientific] for 12 hours. The resin was collected by filtration, and washed with DMF, then DCM, to provide the first component piece.
A solution of Fmoc-alanine (3 equiv., second component piece, commercially available), HATU (PerSeptive Biosystems, 3 equiv.), and DIEA (3 equiv.) in NMP (Advanced ChemTech) was added to the resin. After the reaction mixture was shaken for 4 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF, to thereby add the second component piece to the first component piece.
To the resin was added 20% piperidine in DMF. After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
A solution of N′-Fmoc-N-methyl-hydrazinocarbonyl chloride (combined third and fourth component pieces, 5 equiv.) obtained in the above step (1), DIEA (5 equiv.) in DCM was added to the resin prepared above. After the reaction mixture was shaken for 4 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and DMF.
To the resin was added 20% piperidine in DMF (10 ml for 1 g of the resin). After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
The resin was treated with a mixture of benzyl isocyanate (4 equiv.) and DIEA (4 equiv.) in DCM for 4 hours at room temperature. Then, the resin was collected by filtration and washed with DMF, DCM, and then MeOH. The resin was dried in vacuo at room temperature.
The resin was treated with formic acid for 14 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under reduced pressure to give the product as an oil.
1H-NMR (400 MHz, CDCl3) δ ppm; 1.48 (d, 3H), 2.98 (s, 3H), 3.18 (m, 1H), 3.46 (m, 1H), 4.37-4.74 (m, 5H), 5.66 (dd, 1H), 6.18 (m, 1H), 7.10-7.40 (m, 10H).
The title compound is prepared according to the same procedure as described in Example 2, but reacting bromoacetal resin with a solution of methyl amine instead of benzyl amine. 1H-NMR (400 MHz, CDCl3) δ ppm; 1.48 (d, 3H), 2.99 (s, 3H), 3.03 (s, 3H), 3.38 (m, 1H), 3.53 (dd, 1H), 4.36 (dd, 1H), 4.52 (q, 1H), 4.59 (dd, 1H), 5.72 (dd, 1H), 6.19 (br.t, 1H), 7.10-7.38 (m, 5H).
Bromoacetal resin (30 mg, 0.98 mmol/g) and a solution of naphthylmethyl amine in DMSO (1.5 ml, 2 M) were placed in vial with screw cap. The reaction mixture was shaken at 60° C. using rotating oven [Robbins Scientific] for 12 hours. The resin was collected by filtration, and washed with DMF, then DCM to provide the first component piece.
A solution of Fmoc-Tyr(OBut)-OH (3 equiv.), HATU (PerSeptive Biosystems, 3 equiv.), and DIEA (3 equiv.) in NMP (Advanced ChemTech) was added to the resin. After the reaction mixture was shaken for 4 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF, to thereby add the second component piece to the first component piece.
To the resin was added 20% piperidine in DMF. After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
A solution of N′-Fmoc-N-methyl-hydrazinocarbonyl chloride (5 equiv.), DIEA (5 equiv.) in DCM was added to the resin prepared above. After the reaction mixture was shaken for 4 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and DMF.
To the resin was added 20% piperidine in DMF (10 ml for 1 g of the resin). After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
The resin was treated with a mixture of benzyl isocyanate (4 equiv.) and DIEA (4 equiv.) in DCM for 4 hours at room temperature. Then, the resin was collected by filtration and washed with DMF, DCM, and then MeOH. The resin was dried in vacuo at room temperature.
The resin was treated with formic acid for 14 hours at room temperature. After the resin was removed by filtration, the filtrate was condensed under reduced pressure to give the product as an oil.
1H-NMR (400 MHz, CDCl3) δ ppm; 2.80-2.98 (m, 5H), 3.21-3.37 (m, 2H), 4.22-4.52 (m, 2H), 4.59 (t, 1H), 4.71 (d, 1H), 5.02 (dd, 1H), 5.35 (d, 1H), 5.51 (d, 1H), 6.66 (t, 2H), 6.94 (dd, 2H), 7.21-8.21 (m, 12H).
Bromoacetal resin (60 mg, 0.98 mmol/g) and a solution of naphthyl amine in DMSO (2.5 ml, 2 M) were placed in vial with screw cap. The reaction mixture was shaken at 60° C. using rotating oven [Robbins Scientific] for 12 hours. The resin was collected by filtration, and washed with DMF, then DCM.
A solution of Fmoc-Tyr(OBut)-OH (4 equiv.), HATU [PerSeptive Biosystems] (4 equiv.), and DIEA (4 equiv.) in NMP (Advanced ChemTech) was added to the resin. After the reaction mixture was shaken for 4 hours at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
To the resin was added 20% piperidine in DMF. After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
A solution of Nβ-Fmoc-Nα-benzyl-hyrazinoglycine (4 equiv.), HOBT [Advanced ChemTech] (4 equiv.), and DIC (4 equiv.) in DMF was added to the resin prepared above. After the reaction mixture was shaken for 3 hours at room temperature, the resin was collected by filtration and washed with DMF, and then DCM. To the resin was added 20% piperidine in DMF (10 ml for 1 g of the resin). After the reaction mixture was shaken for 8 min at room temperature, the resin was collected by filtration and washed with DMF, DCM, and then DMF.
The resin was treated with a mixture of benzyl isocyanate (4 equiv.) and DIEA (4 equiv.) in DCM for 4 hours at room temperature. Then, the resin was collected by filtration and washed with DMF, DCM, and then MeOH. After the resin was dried in vacuo at room temperature, the resin was treated with formic acid (2.5 ml) for 18 hours at room temperature. The resin was removed by filtration, and the filtrate was condensed under reduced pressure to give the product as an oil.
1H-NMR (400 MHz, CDCl3) δ ppm; 2.73 (s, 3H), 3.13 (d, 1H), 3.21-3.38 (m, 3H), 3.55 (d, 1H), 3.75 (t, 1H), 4.22 (dd, 1H), 4.36 (dd, 1H), 4.79 (d, 1H), 5.22 (t, 1H), 5.47 (m, 2H), 6.68 (d, 2H), 6.99 (d, 2H), 7.21-8.21 (m, 12H);
MS (m/z, ESI) 564.1 (MH+) 586.3 (MNa+).
The test compound (Compound A) used in this example was prepared in Example 4.
a. Reporter Gene Assay
SW480 cells were transfected with the usage of Superfect™ transfect reagent (Qiagen, 301307). Cells were trypsinized briefly 1 day before transfection and plated on 6 well plate (5×105 cells/well) so that they were 50-80% confluent on the day of transfection.
Four microgram (TOPFlash) and one microgram (pRL-null) of DNAs were diluted in 150 μl of serum-free medium, and 30 μl of Superfect™ transfect reagent was added. The DNA-Superfect mixture was incubated at room temperature for 15 min, and then, 1 ml of 10% FBS DMEM was added to this complex for an additional 3 hours of incubation. While complexes were forming, cells were washed with PBS twice without antibiotics.
The DNA-Superfect™ transfect reagent complexes were applied to the cells before incubating at 37° C. at 5% CO2 for 3 hours. After incubation, recovery medium with 10% FBS was added to bring the final volume to 1.18 ml. After 3 hours incubation, the cells were harvested and reseeded to 96 well plate (3×104 cells/well). After overnight incubation at 37° C. at 5% CO2, the cells were treated with Compound A for 24 hours. Finally, the activity was checked by means of luciferase assay (Promega, E1960).
b. Sulforhodamine B (SRB) Assay
Growth inhibitory effect of Compound A on the cells listed below was measured by the sulforhodamine B assay. SW480 cells in 100 μl media were plated in each well of 96-well plate and allowed to attach for 24 hours. Compound A was added to the wells to produce the desired final concentrations, and the plates were incubated at 37° C. for 48 hours. The cells were then fixed by gentle addition of 100 μl of cold (4° C.) 10% trichloroacetic acid to each well, followed by incubation at 4° C. for 1 hour. Plates were washed with deionized water five times and allowed to air dry. The cells were then stained by addition of 100 μl SRB solution (0.4% SRB(w/v) in 1% acetic acid (v/v)) to wells for 15 min. After staining, the plates were quickly washed five times with 1% acetic acid to remove any unbound dye, and allowed to air dry. Bound dye was solubilized with 10 mmol/L Tris base (pH 10.5) prior to reading the plates. The optical density (OD) was read on a plate reader at a wavelength of 515 nm with Molecular Device. Inhibition of growth was expressed as relative viability (% of control) and GI50 was calculated from concentration-response curves after log/probit transformation.
Table 6 shows in vitro cyclotoxicity (SRB) assay data for Compound A obtained in Example 4. The values in Table 6 are in μg/ml.
Selected compounds of the present invention (Compound B and Compound C) were evaluated in the min mouse model to evaluate their efficacy as anti-cancer agents.
The min mouse model is a widely used model to test for this type of efficacy. The numbers of polyp formed in small intestine and colon of these mice after various treatments were measured (Table 7). The data shown that both compounds, when administered at about 300 mpk, reduce the number of polyp in min mice compared to those in the control mice treated with vehicle only.
The following compound (Compound D) was used in this example:
Materials and Methods
Plasmids. TOPFLASH and FOPFLASH reporter constructs were transformed into DH5α competent cells by standard protocol. Plasmids used for transfection assays were isolated and purified using EndoFree Maxi Kit (Qiagen, Valencia, Calif.).
PC-12 Cell Culture. PC-12 cells were maintained in RPMI 1640 supplemented with 10% horse serum, 5% fetal bovine serum, 4.5 g/L glucose, 2 mM L-glutamine, 1.0 mM sodium pyruvate and 10 μg/ml penicillin-streptomycin.
Cell Differentiation. Cell culture dishes were pre-coated overnight with 0.25 mg/ml collagen (Cohesion, CA), 10 μg/ml Poly-L-Lysine (Sigma-Aldrich, St. Louis, Mo.) and 12 μg/ml Polyethyleneimine (ICN, La Mesa, Calif.). Cells were cultured on coated dishes at 15,000 cells/cm2, and differentiated into a neuron-like phenotype by incubation in medium with reduced serum (1% fetal bovine serum), containing 50 ng/ml nerve growth factor (NGF) (Sigma-Aldrich) for 10 days. NGF-containing medium was changed every 2-3 days.
Treatment with Compound D. Compound D, a small molecule inhibitor of β-catenin/CBP interaction, was dissolved in DMSO at a stock concentration of 100 mM. Differentiated PC-12/L286V cells were treated with increasing concentrations of this compound for 4 hours. Transfection was then initiated after this treatment period. For cell differentiation experiments, Compound D was added at a concentration of 10 μM, together with NGF, for the entire differentiation period.
Transfection. PC-12 cells were cultured and differentiated on 60-mm dishes. At the end of the 10-day differentiation period, cells were transfected with 2 μg reporter constructs, TOPFLASH and FOPFLASH, per 60-mm dish. Transfections were performed using Superfect (Qiagen) according to manufacturer's instructions.
Luciferase Assays. Cells were lysed, 6 hours after transfections, in 100 μl of Cell Culture Lysis Reagent (Promega, Madison, Wis.), and scraped into microcentrifuge tubes. Tubes were then centrifuged briefly (about 10 seconds) at 12000 rpm to pellet cell debris. Luciferase activity was measured on 20 μl of cell lysate and 100 μl substrate from the Luciferase Assay System (Promega). Luciferase activity was measure using Packard LumiCount. (Hewlett Packard). Quantitation of luciferase was performed in triplicates, and repeated in at least three independent experiments.
Immunofluorescence. Cells were plated at a density of 10,000 cells/cm2 on sterile coated 22×22 mm coverslips in a 6-well culture plate. Differentiation was initiated, as previously described, for 10 days. The differentiated cells were then fixed in methanol for 15 minutes at −20° C. This is followed by a 15 minutes incubation with PBS+0.1% Triton X-100. The coverslips were incubated with antibodies raised against Ephrin B2 Receptor (Santa Cruz Biotechnology) and Gap-43 (Novus Biologicals) for 40 minutes at 37° C. After a series of washes with PBS-Triton X-100, secondary antibody conjugated to FITC (Jackson ImmunoResearch, Westgrove, Pa.) was applied. All slides images were acquired using a Nikon PCM2000 Laser Scanning Confocal Microscope mounted on a Nikon Eclipse E600 upright microscope (Nikon, Melville, N.Y.).
Quantitation of Neurite Outgrowth. Cell counts were taken from six randomly chosen microscopic fields (10×). In each field, total number of cells, as well as cells that displayed neurites greater than twice the length of the cell body was determined. The number of cells with such outgrowths was then expressed as a percentage of the total number of cells. Values obtained were from duplicates of three independent experiments.
RT-PCR. To analyze the mRNA levels for Ephrin B2 (EphB2) receptor, total RNA was isolated using Trizol (Invitrogen-GIBCO-BRL, Baltimore, Md.) from differentiated cells. 2 μg RNA was reverse transcribed in a total volume of 20 μl with random hexamer (50 ng), and using the Superscript II reverse transcription system (Invitrogen-GIBCO-BRL), according to manufacturer's guidelines. PCR was carried out in a 50 μl volume containing 5 μl cDNA, 100 pmol primers, 100 μM dNTPs, 1× Taq buffer and 1.5 mM MgCl2. Reaction mixtures were heated to 80° C. for 10 min, after which Taq was added. cDNAs were amplified for 25 (EphB2 receptor) or 15 (GAPDH) cycles. One round of amplification consisted of 1 min at 94° C., 2 min at 60° C., and 2 min at 72° C., with a final extension time of 10 min at 72° C. The PCR products were resolved and visualized by electrophoresis in a 2% gel, stained with ethidium bromide. EphB2 receptor PCR primers used were, 5′-CACTACTGGACCGCACGATAC-3′ and 5′-TCTACCGACTGGATCTGGTTCA-3′. Primer pairs for GAPDH were 5′-GGTGCTGAGTATGTCGTGGA-3′ and 5′-ACAGTGTTCTGGGTGGCAGT-3′.
Results
Rat PC-12 cells are derived from the neural crest lineage and upon nerve growth factor (NGF) treatment, undergo differentiation to a neurite-bearing sympathetic-like neuron (Greene and Tischler, Proc Natl Acad Sci USA 73, 2424 (1976)). Utilizing a PC-12 cell based model, the effects of an early-onset FAD associated PS-1 mutation, PS-1/L286V, on TCF/β-catenin mediated transcription and neuronal differentiation were characterized. It has been demonstrated that specifically blocking transcription mediated by TCF/β-catenin/CBP alleviates PS-1 induced defects in neuronal differentiation.
PC-12 cells stably overexpressing either wild type PS-1 (PS-1/WT) or mutant PS-1 (PS-1/L286V) and a vector-transfected control cell line (Guo et al., Neuroreport, 8, 379 (1996)) were plated on dishes coated with collagen, poly-L-lysine and poly-ethyleneimine. Differentiation was induced by treatment with 50 ng/ml of NGF for 10 days. Overexpressing PS-1/WT cells or the vector-transfected cells had extensive neurite formation (similar to PC-12 cell clones from ATCC), whereas the PS-1/L286V mutant cells had only stubby neurite formation (
To assess the effects of the PS-1/L286V mutation on canonical Wnt/β-catenin signaling, we transiently transfected NGF treated PC-12 cells with Topflash, a Wnt/β-catenin signaling reporter construct (Morin et al., Science 275, 1787 (1997)). As seen in
It was hypothesized that dysregulated TCF/β-catenin signaling in the PS-1/L286V mutant cells was responsible for the defective differentiation and neurite outgrowth. To test this hypothesis, a specific small molecule inhibitor of TCF/β-catenin signaling, Compound D (Emami et al., Cancer Cell, in press), was used. This small molecule selectively blocks the β-catenin/CBP interaction, but not the β-catenin/p300 interaction, thereby interrupting a subset of TCF/β-catenin transcription. Treatment of the PS-1/L286V mutant cells with 10 μM Compound D plus NGF decreased TCF/β-catenin reporter gene transcription, and led to essentially normal neurite outgrowth and differentiation (
Ephrin B2 receptors (EphB2) have been implicated in synapse formation (Wilkinson, Nat. Rev. Neurosci. 2, 155 (2001)) and the Ephrin A family has recently been shown to play a role in hippocampal dendritic spine morphology (Murai et al., Nat. Neurosci. 6, 153 (2003)). Focused EphB2 expression was observed, which localized with neuronal processes in the vector and PS-1/WT-transfected cells (
Flow Cytometric Analysis (FACS)
For FACS analysis, approx. 5×106 cells from Compound D-treated or vehicle-treated were fixed with 70% chilled ethanol and stored at −20° C. for at least 30 minutes. The cells were washed once with 1×PBS and incubated with propidium iodine (PI) solution (85 μg/ml propidium iodine, 0.1% Nonidet P-40, 10 mg/ml RNAse) for 30 minutes at room temperature. 10,000 stained cells for each sample were acquired using Beckman Coulter EPICS XL-MCL Flow Cytometry and the percentage of cells in different phase of the cell cycle was determined by Expo32 ADC software (Coulter Corporation, Miami, Fla., 33196).
Caspase-3 Activity Assay
SW480, HCT116, and CCD18Co cells were plated at 105 cells per well (96-well plates) for 24 hours prior to treatment. 25 μM of Compound D or control (0.5% DMSO) was added to each well. 24 hours post treatment, cells were lysed and caspase activity was measured using a caspase-3/7 activity kit (Apo-One Homogeneous caspase-3/7 assay, #G77905, Promega). Relative fluorescence units (RFU) were obtained by subtracting the unit values of the blank (control, without cells) from the experimental measured values.
Compound D Causes a G1/S-Phase Arrest and Activates Caspase Activity
It has been shown that inhibition of the expression of the cyclin D1 gene causes arrest at the G1/S-phase of the cell cycle (Shintani et al., “Infrequent alternations of RB pathway (Rb-p16INK4A-cyclin D1) in adenoid cystic carcinoma of salivary glands,” Anticancer Res. 20:2169-75 (2000)). HCT116 (
Caspases are cysteine proteases that are generally activated in a given population of cells triggered by apoptotic stimuli. To assess apoptotic induction in SW480, HCT116, and wild-type colonocytes (CCD18Co cells), the cells were treated with either Compound D (25 μM) or control (0.5% DMSO) for 24 hours, followed by an assay for caspase-3/7 activity. As shown in
Soft Agar Assays
The soft agar colony formation assay was conducted with SW480 cells by some modification of the procedure previously described (Moody et al., “A vasoactive intestinal peptide antagonist inhibits non-small cell lung cancer growth,” Proc. Natl. Acad. Sci. USA. 90:4345-49 (1993)).
Each well (35 mm) of a 6-well plate (Nalge Nunc International, Roskide, Denmark) was coated with 1 ml of 0.8% bottom agar in DMEM medium containing 10% fetal bovine serum. After it was solidified, 1 ml of DMEM medium containing 0.4% top agar, 10% fetal bovine serum, compound doubly concentrated, and 5,000 single viable cells was added to each well. The cultures were incubated at 37° C. in humidified 5% CO2 incubator. Colonies in soft agar were monitored daily and photographed after incubation for 8 days. Colonies >60 μm in diameter were counted.
Compound D Reduces Proliferation of Transformed Colorectal Cells
Soft agar colony forming assays were performed using SW480 cells treated with Compound D (0.25-5 μM) and 5-fluorouracil (5-FU) (0.5-32 μM). As shown in
SW620 cells (9×106 cells/mouse) were grafted into nude mice subcutaneously on Day 0. Mice received 200 mg/kg of Compound C intraperitoneally every other day until Day 21 after 4 times of 300 mg/kg every other day starting Day 1. Compound C reduces the tumor growth in the treated mice compared to the vehicle control mice (
The effect of Compound D on survivin expression was studied at both transcriptional and translational levels. The methods used at the transcriptional level include cDNA microarray analysis, RT-PCR, survivin reporter assays and chromotin immunoprecipitation (ChIP). The methods used at translational levels include Western blot analysis and immunochemistry.
A plasmid containing luciferase under the control of survivin promoter was constructed and transfected into wild type, CBP+/−, or p300+/−3T3 cells. The results (
Real time reverse transcription-PCR analysis was performed according to the protocol provided with the SYBR Green PCR Master Mix Kit (Perkin Elmer Biosystems, Shelton, ST). Total RNA templates for the RT-PCR reactions were extracted with the RNeasy Midi Kit (Qiagen) from cells treated with Compound D (25 μM) or control (0.5% DMSO) 24 hours after treatment. The primers used for the RT-PCR reactions were 5′-AGCCCTTTCTCAAGGACCAC-3′ and 5′-GCACTTTCTTCGCAGTTTCC-3′. Table 8 shows the results of the analysis. A ratio less than 0.5 indicates a significant decrease of gene expression due to the treatment of Compound D, whereas a ratio greater than 1.5 indicates a significant increase of gene expression. A ratio about 1 indicates no change. As indicated in Table 8 and
ChIP assays on SW 480 cells treated with either Compound D (25 μM) or control (0.5% DMSO) were performed. As shown in
To characterize the effect of Compound D on the survivin expression at the translational level, Western blot analysis of extracts of cells treated with vehicle (0.5% DMSO) alone, 10 μM or 25 μM Compound D, or 5 μM 5-FU was performed using survivin 6E4 monoclonal antibody (Cell Signaling Technology). The results (
The effect of Compound D on the survivin expression at the translational level was further characterized using immunofluorescence microscopy. In the absence of Compound D, survivin localizes to the mitotic spindle apparatus, consistent with the notion that survivin is involved in chromosomal separation (
The effects of various compounds having general formula (I) on survivin and TCF4 expression were characterized. The results are shown in Table 9.
To determine the effect of Compound D on apoptosis and the role of survivin in such an effect, the activities of caspases 2 and 3 in cultured tumor cells treated with either Compound D or control were measured. The results (
The effect of compound D on apoptosis and the role of survivin in such an effect were further characterized by measuring cell death of cultured tumor cells treated with staurosporine (0.5 μM), Compound D (5.0 μM) or both. The results (
To determine the effect of Compound D on cell cycle and the role of survivin in such an effect, FACS analysis was performed on cultured tumor cells with or without transfection of a construct containing the survivin gene and further treated with stausporine (0.5 μM), Compound D (5 μM), or both. The results (
(1) General Procedure for Preparing Prodrugs by Phosphorylation of Phenol Group
The starting phenol (26.06 mmol) was dissolved in tetrahydrofuran (130 ml), followed by addition of triethylamine (TEA) (10.9 ml, 78.18 mmol) at room temperature. The reaction mixture was cooled to 5° C., and then POCl3 (12.2 ml, 130.3 mmol) was added slowly. After addition was finished, the mixture was allowed to warm to room temperature, and stirred at this temperature for 5 hours. After the reaction was completed, the mixture was poured into celite-pad filter funnel to remove TEA-HCl salt. Organics was diluted with water (130 ml) at 5° C., followed by adjusting pH 7˜8 using sodium bicarbonate (50 g), and the resulting basic solution was stirred overnight at room temperature. The resulting aqueous layer was washed with EtOAc (100 ml), and then lyophilized. The crude product was dissolved in methylene chloride (100 ml), followed by for 1 hour at room temperature. Inorganic salts were removed by filtration using celite pad, then solvent was evaporated. The crude product was purified by recrystallization (EA/Ether) to get 9.5 g of phosphorylated product as an off-white solid.
(2) Typical Work-Up Procedure for the Free Form of Phosphate
After washing the resulting basic aqueous layer, the solution was acidified to pH 3˜4 using 1N HCl, and then the phosphate free form was extracted twice with chloroform (300 ml). The organic layer was dried over sodium sulfate, and the crude product was purified by recrystallization.
(3) Converting Method from Free Form to Di-Sodium Form
A. Titration Method
Free form of phosphate can be transformed to di-sodium salt form by titration, which could use many inorganic bases. For example, sodium carbonate, sodium bicarbonate, and sodium hydroxide are used in this experiment to produce di-sodium form. Other cations can be used to make different di-salt forms.
1. Analytical method and instrument for titration
B. Using Organic Sodium Donor
The basic drawback of titration using inorganic base is that the water must be used for the solvent. So searching the sodium donor dissolved freely in normal organic solvent is the easiest way to solve the problem. Several reagents such as sodium acetate and sodium ethylhexanoic acid were tested and found to be useful for making a di-sodium salt form.
Table 10 shows compounds for bioactivity test selected from the prodrugs of the present invention and IC50 values thereof, which are measured by the reporter gene assay (RGA) and oncogenic activity by MTS or Sulforhodamine B assay as described in Example 6. The compound numbers on Table 10 are unrelated to those in Table 4 or 5.
General Procedure for Solubility Test of Prodrugs
About 2 mg of each prodrug was dissolved in 1 ml of JP1 or JP2 solution as indicated below. Incubating at a temperature of 37° C., 200 ul of samples were withdrawn at 0 hour, 2 hour and 20 hour. Withdrawn samples were filtered through 0.45 μm syringe filters and analyzed by HPLC system.
Table 11 below shows the results of solubility test of selected prodrugs. The compound numbers on Table 11 are unrelated to those in Table 4, 5 or 10.
To a stirred solution of starting material (SM) (8.0 g, 13.9 mmol) and potassium carbonate (5.8 g, 41.7 mmol) in dimethylformamide was added dimethylcarbamyl chloride (3.0 g, 27.8 mmol). The reaction mixture was stirred overnight and then dissolved in EtOAc, washed with water five times. The combined organic layer was washed with brine, dried over sodium sulfate, concentrated in vacuo. The residue was chromatographed on silica gel with neat EtOAc to afford product (4.2 g, 32%). The data from analyzing the resulting product by mass spectrometry and NMR are:
MS (ESI): m/e 647 (M+1), 669 (M+Na).
1H-NMR (300 MHz, CDCl3) δ 7.27-7.39 (6H, m), 6.78-7.13 (6H, m), 6.68 (1H, t, J=6.0 Hz), 5.61-5.70 (2H, m), 5.34 (1H, t, J=6.0 Hz), 5.06-5.20 (2H, m), 4.31-4.69 (4H, m), 3.24-3.58 (8H, m), 3.07 (3H, s), and 2.99 (3H, s).
To a stirred solution of 2-Allyl-8-(2,4-difluoro-benzyl)-6-(4-hydroxy-benzyl)-4,7-dioxohexahydro-pyrazino[2,1-c][1,2,4]triazine-1-carboxylic acid benzylamine (1) (2 g, 3.47 mmol) in THF (40 ml) was added Triethylamine (0.97 ml, 6.95 mmol) and 4-nitrophenylchloroformate (0.7 g, 3.47 mmol). After stirring at room temperature for overnight, the solvent was removed under reduced pressure. The crude compound was purified by chromatography (Hexane, EtOAc 1:1) to give the compound (1.59 g, 62%). The data from analyzing the purified compound by TLC system and NMR are:
TLC System: Rf=0.3 (n-Hexane:EtOAc 1:1)
1H NMR (300 MHz, CDCl3): δ 3.25-3.60 (m, 8H), 4.35 (dd, J=14.9 Hz, 5.7 Hz, 1H), 4.43 (dd, J=14.8 Hz, 6.1 Hz, 1H), 4.52 (d, 14.5 Hz, 1H), 4.68 (d, 14.1H), 5.10 (d, 17.1 Hz, 1H), 5.21 (d, 10.3 Hz, 1H), 5.34 (t, J=6.1 Hz, 1H), 5.58 (dd, J=11.1 Hz, 4.1 Hz, 1H), 5.67 (m, 1H), 6.71 (t, J=6.1 Hz, NH), 6.75-6.98 (m, 2H), 7.13 (d, J=8.4 Hz, 2H), 7.21 (d, J=8.7 Hz, 2H), 7.23-7.39 (m, 6H), 7.46 (d, J=9.5 Hz, 2H), and 8.30 (d, J=9.5 Hz, 2H).
To a stirred solution of carbonic acid 4-[2-allyl-1-benzylcarbamoyl-8-(2,4-difluoro-benzyl)-4,7-dioxo-octahydro-pyrazino[2,1-c][1,2,4]triazin-6-ylmethyl]-phenyl ester 4-nitro-phenyl ester (2) (1.2 g, 1.62 mmol) in DMF (25 ml) was added N,N-Dimethylethylenediamine (0.26 ml, 2.43 mmol). After stirring at room temperature for overnight, the solvent was removed under reduced pressure. The residue was diluted with EtOAc and washed with water, brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The crude compound was purified by chromatography (n-Hexane:EtOAc, 1:1; EtOAc; CH2Cl2: MeOH, 9:1). The compound was poured with water and was maintained pH 5-6 with 1N aq. HCl to make HCl salt and then lyophilized to get the compound (0.75 g, 60%). The data from analyzing the resulting compound by TLC system and NMR are:
TLC System: Rf=0.35 (CH2Cl2:MeOH, 9:1)
ESI-MS: M+H+ 690.39
1H NMR (300 MHz, CDCl3): δ 2.56 (d, J=4.6 Hz, 6H), 3.18 (bm, 4H), 3.41-3.58 (m, 4H), 3.75 (t, J=10.3 Hz, 1H), 4.21 (bt, 2H), 4.35 (d, J=14.9 Hz 1H), 4.70 (d, J=14.9 Hz 1H), 5.05 (m, 1H), 5.12 (m, 1H), 5.42 (m, 6H), 5.80 (m, 1H), 6.91 (d, J=7.6 Hz, 2H), 7.04 (d, J=7.3, 2H), 7.09 (m, 1H), 7.18-7.26 (m, 6H), 7.31 (d, J=6.9 Hz, 2H), 7.33 (m, 1H), 7.84 (bt, NH), 7.98 (bt, NH), 10.7 (bs, 1H)
Animal Experiment
Drugs were prepared 10 mg/kg/5 ml in 10% Tween 80. Studies were performed in ICR mice. After i.v. bolus injection through the tail vein, blood samples were acquired from inferior vena cava at several time points and separated to plasma by centrifugation. Plasma samples were preserved at −20° C. until they were analyzed. Bleeding time points were 3, 6, 9, 17, 34, 67, 134, 202, 302 min. N=4.
Sample Preparation
For calibration curve, 98 ul aliquots of control mouse plasma were added 2 ul of drug stock solution and added 2 ul internal standard stock solution, 5 ug/ml of internal standard. Final concentrations of calibration samples were 1, 10, 100, 1000 ng/ml and 10 ug/ml. For plasma sample from animal experiment, 100 ul of plasma were added 2 ul of internal standard. Then, all the samples were added 500 ul of acetonitrile, 500 ul of ethylacetate and 100 ul of DW. Samples were mixed for 10 min and centrifuged. The supernatants were transferred another tubes and evaporated. Adding 200 ul of 40% acetonitrile, they were reconstituted and analyzed by LC-MS system.
Results
The changes of concentrations of prodrug A and its parent compound in mouse plasma with the increase of time after i.v. bolus injection of prodrug A are shown in
SW480 or HCT116 cells were placed into 96 well microplate (104 cells/well) and incubated for 24 hours at 37° C. 20 μl of [3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt] (MTS) solution (Promega) was added into each well and the absorbance after 2 hour incubation at 37° C. (negative control) was read. And then, the cells were treated with a test compound at various concentrations for 48 hours. 20 μl of MTS solution (Promega) was added into each well and incubated for 2 hour at 37° C. Cell viability was measured by reading the absorbance at 490 nm using a microplate reader (Molecular device) and cytotoxicity of a compound at each concentration was calculated. The results are shown in the table below.
Soft agar plates were prepared to contain 10% fetal bovine serum (FBS), 2 mM L-glutamine, 0.1 mM non-essential amino acid, 1× pen/strep (10000 units/mL Penicillin, 10000 ug/ml Streptomycin in 0.85% NaCl) and 1.6% agarose for bottom layer and DMEM containing 10% FBS, 2 mM L-glutamine, 0.1 mM non-essential amino acid, 1× pen/strep for upper layer. Compound A solution and upper layer solution containing agarose were mixed, and SW480 cells were added and solidified. Plates were incubated 37° C. at CO2 incubator for 8 days after solidification at room temperature for 30 min, and colonies were counted under microscope (
Tube formation assay was performed using an In Vitro Angiogenesis Assay Kit (Chemicon International, Inc., Temecula, Calif., USA). Briefly, solid gels were prepared according to the manufacturer's manual on a 96-well tissue culture plate. HUVEC (1×105 cells/ml) in HuMedia EG-2 medium containing 0-250 M of vitamin B6 were seeded 100 μl per well onto the surface of the solid gel, ECMatrix™. The cells were incubated with vehicle control, Compound E at 0.1 μM, 0.3 μm, 1.0 μM, 3 μM, and 10 μM, or Fumagilin at 10 μM for 12 h at 37° C. in a CO2 incubator. Tube formation was observed under an inverted light microscope at ×100 magnification. Microscopic fields were photographed with a digital camera. The results show that Compound E inhibited tube formation in a dose-dependent manner (
To induce polyarthritis, six-week-old male S.D. rats received intradermal injection (base of tail) of 100 μl of Mycobacterium butyricum (Cat. No. 264010, Difco) in mineral oil (5 mg/ml) on Day 0. The test compound, Compound F, was given once daily at Day 1, 2, 3, 4, 5, 8, 10, 12 and 14 by oral gavage. Non-treated control rats (NT) did not receive Mycobacterium or Compound F. Vehicle control rats (VH) received the pharmacological carrier used for Compound F. For reference, indomethacin (Sigma, 3 mg/kg) was given once daily at Day 1, 2, 3, 4, 5, 8, 10, 12 and 14 by oral gavage. The paw thickness was measured with digital caliper (Mitutoyo, Japan) and the arthritic index was accessed (
Male young ICR mice received intraperitoneal injection of LPS (E. coli O111:B4). Compound F was administered perorally 60 min prior to LPS challenge and blood was drawn 90 min subsequent to challenge. Vehicle control mice received the pharmacological carrier used for Compound F only. Concentration of TNF-α in the serum was determined by ELISA method.
Stably transfected NF-κB A549 cells were maintained with RPMI-1640 containing 10% FBS, 0.1 mM non-essential amino acid, 1× pen/strep and G418 (400 μg/ml). Cells were transferred into each well of 96 well white opaque plates (1×104 cells/well/50 μl) and incubated 24 hr at 37° C. in 5% CO2 incubator. The test compound, Compound F, was added to each well, and 1 hr later, phorbol 12-myristate 13-acetate (PMA) (10 ng/ml) was added into each well. Plates were incubated further for 6 hr at 37° C. in 5% CO2 incubator. One hundred microliter of Dual-glo FireFly substrate (Promega) was added and incubated for 10 min. Luminescence of each well was measured with a luminometer (Victor II) (
LPS-induced TNF-α production in THP-1 cells: THP-1 cells were incubated with 200 nM PMA for 24 hr. Cells were harvested with trypsin and seeded into 96 well tissue culture plates (2×104 cells/well). The test compound, Compound F, was added to each well followed by LPS (100 ng/ml). The cells were further incubated for 6 hr at 37° C. in a CO2 incubator. Media was collected and concentration of TNF-α was determined with the ELISA kit (OptEIA, BD). IC50 of Compound F was 7.083 μM in this assay (
PMA/Ionomycin-induced IL-2 production in Jurkat cells: Jurkat cells were seeded into 96 well tissue culture plates (1×105 cells/well) and treated with the test compound, Compound F, and further incubated for 60 min at 37° C. in a CO2 incubator. Stimulant (10 ng/ml PMA and 1 μg/ml ionomycin) was added into each well, and the cells were further incubated for 6 hr at 37° C. in a CO2 incubator. Supernatant was collected and concentration of IL-2 was determined with the ELISA kit (OptEIA, BD). IC50 of Compound F was 8.483 μM in this assay (
It will be appreciated that, although specific embodiments of the invention have been described herein for the purposes of illustration, various modifications may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not limited except by the appended claims.
All of the above U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet are incorporated herein by reference.
From the foregoing it will be appreciated that, although specific embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without deviating from the spirit and scope of the invention. Accordingly, the invention is not limited except as by the appended claims.
This application is a continuation of co-pending U.S. patent application Ser. No. 11/974,941, filed Oct. 15, 2007. The disclosure of this application is incorporated herein by reference in its entirety.
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