Patent Application
20110212939
The present invention is directed to G-protein coupled receptor (GPCR) agonists. In particular, the present invention is directed to agonists of GPR119 that are useful for the treatment of obesity, e.g. as regulators of satiety, metabolic syndrome and for the treatment of diabetes.
Obesity is characterized by an excessive adipose tissue mass relative to body size. Clinically, body fat mass is estimated by the body mass index (BMI; weight(kg)/height(m)2), or waist circumference. Individuals are considered obese when the BMI is greater than 30 and there are established medical consequences of being overweight. It has been an accepted medical view for some time that an increased body weight, especially as a result of abdominal body fat, is associated with an increased risk for diabetes, hypertension, heart disease, and numerous other health complications, such as arthritis, stroke, gallbladder disease, muscular and respiratory problems, back pain and even certain cancers.
Pharmacological approaches to the treatment of obesity have been mainly concerned with reducing fat mass by altering the balance between energy intake and expenditure. Many studies have clearly established the link between adiposity and the brain circuitry involved in the regulation of energy homeostasis. Direct and indirect evidence suggest that serotonergic, dopaminergic, adrenergic, cholinergic, endocannabinoid, opioid, and histaminergic pathways in addition to many neuropeptide pathways (e.g. neuropeptide Y and melanocortins) are implicated in the central control of energy intake and expenditure. Hypothalamic centres are also able to sense peripheral hormones involved in the maintenance of body weight and degree of adiposity, such as insulin and leptin, and fat tissue derived peptides.
Drugs aimed at the pathophysiology associated with insulin dependent Type I diabetes and non-insulin dependent Type II diabetes have many potential side effects and do not adequately address the dyslipidaemia and hyperglycaemia in a high proportion of patients. Treatment is often focused at individual patient needs using diet, exercise, hypoglycaemic agents and insulin, but there is a continuing need for novel antidiabetic agents, particularly ones that may be better tolerated with fewer adverse effects.
Similarly, metabolic syndrome (syndrome X) places people at high risk of coronary artery disease, and is characterized by a cluster of risk factors including central obesity (excessive fat tissue in the abdominal region), glucose intolerance, high triglycerides and low HDL cholesterol, and high blood pressure. Myocardial ischemia and microvascular disease is an established morbidity associated with untreated or poorly controlled metabolic syndrome.
There is a continuing need for novel antiobesity and antidiabetic agents, particularly ones that are well tolerated with few adverse effects.
GPR119 (previously referred to as GPR116) is a GPCR identified as SNORF25 in WO00/50562 which discloses both the human and rat receptors, U.S. Pat. No. 6,468,756 also discloses the mouse receptor (accession numbers: AAN95194 (human), AAN95195 (rat) and ANN95196 (mouse)).
In humans, GPR119 is expressed in the pancreas, small intestine, colon and adipose tissue. The expression profile of the human GPR119 receptor indicates its potential utility as a target for the treatment of obesity and diabetes.
International patent applications WO2005/061489, WO2006/070208 and WO2006/067532 disclose heterocyclic derivatives as GPR119 receptor agonists. International patent applications WO2006/067531, WO2007/003960, WO2007/003961, WO2007/003962 and WO2007/003964, WO2007/116230 and WO2007/116229 disclose GPR119 receptor agonists.
The present invention relates to agonists of GPR119 which are useful for the treatment of diabetes and as peripheral regulators of satiety, e.g. for the treatment of obesity and metabolic syndrome.
Compounds of formula (I):
or pharmaceutically acceptable salts thereof, are agonists of GPR119 and are useful for the prophylactic or therapeutic treatment of diabetes and obesity.
The present invention is directed to a compound of formula (I), or a pharmaceutically acceptable salt thereof:
wherein Z is phenyl or a 6-membered N containing heteroaryl group which phenyl or heteroaryl group is substituted by —(CH2)j—C(O)NR1R11, -E1-CO2H, —CH(CH3)—C(O)NR1R11, a 5- or 6-membered N containing heterocyclyl ring, which ring is substituted with oxo and optionally substituted by methyl, or a 5- or 6-membered N containing heteroaryl ring optionally containing up to 3 additional heteroatoms selected from N, O and S, which ring is substituted by C1-3 alkyl or —NH2;
or Z is 1H-quinazoline-4-one, 2,3-dihydroisoindol-1-one, 1,3-dihydroindol-2-one, 3,4-dihydro-1H-quinolin-2-one, or 3,4-dihydro-2H-isoquinolin-1-one, which is attached to W through an aromatic carbon atom;
and wherein Z is further optionally substituted by one or more C1-2 alkyl, C1-2 alkoxy, CH2NH2, or fluoro groups;
j is 0, 1 or 2;
E1 is —CH2—, —CH2CH2—, or —CH(CH3)—;
W and Y are independently a bond, an unbranched or a branched C1-4 alkylene optionally substituted by hydroxy or C1-3alkoxy, or an unbranched or a branched C2-4 alkenylene;
X is selected from CH2, O, S, CH(OH), CH(halogen), CF2, C(O), C(O)O, C(O)S, SC(O), C(O)CH2S, C(O)CH2C(OH), C(OH)CH2C(O), C(O)CH2C(O), OC(O), NR5, CH(NR5R55), C(O)NR2, NR2C(O), S(O) and S(O)2;
Rx is hydrogen or hydroxy;
G is CHR3, N—C(O)OR4, N—C(O)NR4R5, N—C1-4alkylene-C(O)OR4, N—C(O)C(O)OR4, N—S(O)2R4, N—C(O)R4 or N—P(O)(O—Ph)2; or N-heterocyclyl or N-heteroaryl, either of which may optionally be substituted by one or two groups selected from C1-4 alkyl, C1-4 alkoxy or halogen; provided that G is not optionally substituted N-pyridazinyl;
R1 and R11 together with the N atom to which they are attached form a 4- to 6-membered ring substituted by —N(R2)2 or —CH2NH2 and optionally further substituted with methyl; or R1 is hydrogen and R11 is C5-6 alkyl substituted by amino or —(CH2)k-L;
in addition, when Z is —CH(CH3)—C(O)NR1R11, R1 may be hydrogen and R11 may be hydrogen, C1-3alkyl, or C2-3alkyl substituted by one or two hydroxy groups;
L is a γ-or δ-lactam optionally substituted with methyl;
k is 0, 1 or 2;
R2 are independently hydrogen or C1-4 alkyl;
R3 is C3-6 alkyl;
R4 is C1-8 alkyl, C2-8 alkenyl or C2-8 alkynyl, any of which may be optionally substituted by one or more substituents selected from halo, NR5R55, OR5, C(O)OR5, OC(O)R5 and CN, and may contain a CH2 group that is replaced by O or S; or a C3-7 cycloalkyl, aryl, heterocyclyl, heteroaryl, C1-4 alkyleneC3-7 cycloalkyl, C1-4 alkylenearyl, C1-4 alkyleneheterocyclyl or C1-4 alkyleneheteroaryl, any of which may be substituted with one or more substituents selected from halo, C1-4 alkyl, C1-4 fluoroalkyl, OR5, CN, NR5R55, SO2Me, NO2 and C(O)OR5;
R5 and R55 are independently hydrogen or C1-4 alkyl; or taken together R5 and R55 may form a 5- or 6-membered heterocyclic ring; or a group NR5 may represent NS(O)2—(2-NO2—C6H4);
d is 0, 1, 2 or 3; and
e is 1, 2, 3, 4 or 5, provided that d+e is 2, 3, 4 or 5.
The molecular weight of the compounds of formula (I) is preferably less than 800, more preferably less than 600, even more preferably less than 500.
Preferably Z is phenyl or a 6-membered heteroaryl group containing up to two N heteroatoms e.g. pyridyl such as 2-pyridyl. Even more preferably Z is phenyl.
Examples of heteroaryl rings that Z may be substituted by include tetrazolyl, e.g. tetrazol-1-yl, oxadiazolyl, e.g. [1,2,4]oxadiazol-5-yl or [1,3,4]oxadiazol-2-yl, thiazolyl, e.g. thiazol-2-yl and pyridyl, e.g. pyrid-2-yl, which rings are substituted by C1-3 alkyl or —NH2.
Preferred substituents for Z are —(CH2), —C(O)NR1R11 and -E1-CO2H.
Suitably, j is 0 or 1. In one embodiment of the invention j represents 0. In a second embodiment of the invention j represents 1. Preferably, j is 0.
E1 is preferably —CH2—.
Suitably W and Y are independently a bond, an unbranched or a branched C1-4 alkylene optionally substituted by hydroxy, or an unbranched or a branched C2-4 alkenylene.
In one embodiment of the invention W and Y are independently a bond, an unbranched or a branched C1-4 alkylene, or an unbranched or a branched C2-4 alkenylene.
Preferably W and Y do not both represent a bond.
Preferably W is a bond.
Preferably Y is an Y is unbranched or a branched C3-4 alkylene optionally substituted by hydroxy or C1-3alkoxy, e.g an unsubstituted unbranched or a branched C3-4 alkylene.
In certain embodiments of the invention —W—X—Y— represents a chain of 2 to 6 atoms in length. —W—X—Y— preferably represents a 4 or 5 atom chain.
When W is C2-3 alkenylene, the stereochemistry at the double bond is preferably (E). Suitably, X is selected from CH2, O, S, CH(OH), CH(halogen), CF2, C(O), C(O)O, C(O)S, SC(O), C(O)CH2S, C(O)CH2C(OH), C(O)CH2C(O), OC(O), NR5, CH(NR5R55), C(O)NR2, S(O) and S(O)2. More suitably X is selected from CH2, O, S, CH(OH), CH(halogen), C(O), C(O)O, C(O)S, SC(O), C(O)CH2S, C(O)CH2C(OH), C(O)CH2C(O), OC(O), NR5, CH(NR5R55), C(O)NR2, S(O) and S(O)2.
X is preferably CH2, CF2, O or NR5 e.g. NH, in particular CH2, O or NR5, especially O.
A preferred group represented by —W—X—Y— is —O—CH2—CH2—CRy—, where Ry is hydrogen or methyl.
Rx is preferably hydrogen.
G is preferably N—C(O)OR4, N—C(O)NR4R5, N—C1-4alkylene-C(O)OR4, N—C(O)C(O)OR4, N-heterocyclyl, N-heteroaryl, N—S(O)2R4, N—C(O)R4 or N—P(O)(O—Ph)2; especially N—C(O)OR4, N—C(O)NR4R5, N—C1-4alkylene-C(O)OR4, N-heteroaryl, N—S(O)2R4 or N—C(O)R4; in particular N—C(O)OR4, N—C(O)NR4R5, N-heteroaryl, N—S(O)2R4 or N—C(O)R4. More preferably, G is N—C(O)OR4 or N-heteroaryl. G is most preferably N-heteroaryl. When G is N-heteroaryl the heteroaryl ring is preferably a 5- or 6-membered heteroaryl ring containing up to three heteroatoms selected from O, N and S, for example pyridin-2-yl, oxadiazolyl, or pyrimidinyl, especially oxadiazolyl or pyrimidin-2-yl. Particularly preferred heteroaryl rings which G may represent are 3-C2-4 alkyl-[1,2,4]oxadiazol-5-yl, especially 3-isopropyl-[1,2,4]oxadiazol-5-yl and 5-chloropyrimidin-2-yl. Alternatively, G is CHR3.
Suitably R2 is hydrogen, methyl or tert-butyl, preferably hydrogen or methyl, more preferably hydrogen.
Exemplary R3 groups include n-pentyl.
Exemplary R4 groups include methyl, ethyl, propyl, iso-propyl, sec-butyl, tert-butyl, butynyl, cyclobutyl, pentyl, 2,2-dimethylpropyl, cyclopentyl, hexyl, cyclohexyl, trifluoroethyl, trichloroethyl, phenyl, methoxyphenyl, tolyl, fluorophenyl, chlorophenyl, trifluoromethylphenyl, nitrophenyl, naphthalenyl, chlorobenzyl, methylsulfanylethyl- and tetrahydrofuranmethyl-.
Preferably R4 represents C1-8 alkyl, C2-8 alkenyl or C2-8 alkynyl optionally substituted by one or more halo atoms or cyano, and may contain a CH2 group that is replaced by O or S; or a C3-7 cycloalkyl, aryl or C1-4 alkylC3-7 cycloalkyl, any of which may be substituted with one or more substituents selected from halo, C1-4 alkyl, C1-4 fluoroalkyl, OR5, CN, NR5R55, NO2 and C(O)OC1-4alkyl. More preferably R4 represents C1-8 alkyl, C2-8 alkenyl or C2-8 alkynyl optionally substituted by one or more halo atoms or CN, and may contain a CH2 group that is replaced by O or S; or a C3-7 cycloalkyl or aryl, either of which may be substituted with one or more substituents selected from halo, C1-4 alkyl, C1-4 fluoroalkyl, OR5, CN, NR5R55, NO2 and C(O)OC1-4alkyl. Most preferred R4 groups are C2-5 alkyl, e.g. C3-5alkyl and especially isopropyl or tert-butyl, optionally substituted by one or more halo or CN groups, and which may contain a CH2 group that is replaced by O or S, or C3-5 cycloalkyl optionally substituted by C1-4 alkyl.
In one embodiment of the invention d+e is 2, 3, or 4. Suitably, d is 1 or 2 and e is 1 or 2. In a preferred embodiment of the invention d and e each represent 1. In a more preferred embodiment of the invention d and e each represent 2.
Suitably R5 and R55 are independently hydrogen or C1-4alkyl; or taken together R5 and R55 may form a 5- or 6-membered heterocyclic ring; in particular R5 represents hydrogen or methyl, especially methyl.
A preferred group of compounds of are those of formula (Ia) and pharmaceutically acceptable salts thereof:
wherein:
Z is as described previously for compounds of formula (I);
Ry is hydrogen or methyl;
Rz is —C(O)OR4 or a 5- or 6-membered heteroaryl group optionally substituted by one or two groups selected from C1-4 alkyl, C1-4 alkoxy or halogen; and
R4 is C2-5 alkyl.
In one embodiment of the compounds of formula (Ia) Ry is hydrogen and in another Ry is methyl. When Ry is methyl, the stereocentre created preferably has the (R)-configuration.
A group of compounds which may be mentioned are those of formula (Ib) and pharmaceutically acceptable salts thereof:
wherein Z is phenyl or a 6-membered N containing heteroaryl group which is substituted by —(CH2), —C(O)NR1R11 or a 5- or 6-membered N containing heteroaryl ring optionally containing up to 3 additional heteroatoms selected from N, O and S, which ring is substituted by C1-3 alkyl or —NH2; and wherein Z is further optionally substituted by one or more C1-2 alkyl, C1-2 alkoxy or fluoro groups;
j is 0, 1 or 2;
W and Y are independently a bond, an unbranched or a branched C1-4 alkylene optionally substituted by hydroxy or C1-3alkoxy, or an unbranched or a branched C2-4 alkenylene;
X is selected from CH2, O, S, CH(OH), CH(halogen), CF2, C(O), C(O)O, C(O)S, SC(O), C(O)CH2S, C(O)CH2C(OH), C(OH)CH2C(O), C(O)CH2C(O), OC(O), NR5, CH(NR5R55), C(O)NR2, NR2 C(O), S(O) and S(O)2;
Rx is hydrogen or hydroxy;
G is CHR3, N—C(O)OR4, N—C(O)NR4R5, N—C1-4alkylene-C(O)OR4, N—C(O)C(O)OR4, N—S(O)2R4, N—C(O)R4 or N—P(O)(O—Ph)2; or N-heterocyclyl or N-heteroaryl, either of which may optionally be substituted by one or two groups selected from C1-4 alkyl, C1-4 alkoxy or halogen; provided that G is not optionally substituted N-pyridazinyl;
R1 and R11 together with the N atom to which they are attached form a 4- to 6-membered ring substituted by —NH2 or —CH2NH2;
R2 are independently hydrogen or C1-4 alkyl;
R3 is C3-6 alkyl;
R4 is C1-8 alkyl, C2-8 alkenyl or C2-8 alkynyl, any of which may be optionally substituted by one or more substituents selected from halo, NR5R55, OR5, C(O)OR5, OC(O)R5 and CN, and may contain a CH2 group that is replaced by O or S; or a C3-7cycloalkyl, aryl, heterocyclyl, heteroaryl, C1-4alkyleneC3-7cycloalkyl, C1-4alkylenearyl, C1-4alkyleneheterocyclyl or C1-4alkyleneheteroaryl, any of which may be substituted with one or more substituents selected from halo, C1-4 alkyl, C1-4 fluoroalkyl, OR5, CN, NR5R55, SO2Me, NO2 and C(O)OR5;
R5 and R55 are independently hydrogen or C1-4alkyl; or taken together R5 and R55 may form a 5- or 6-membered heterocyclic ring; or a group NR5 may represent NS(O)2-(2-NO2—C6H4);
d is 0, 1, 2 or 3; and
e is 1, 2, 3, 4 or 5, provided that d+e is 2, 3, 4 or 5.
While the preferred groups for each variable have generally been listed above separately for each variable, preferred compounds of this invention include those in which several or each variable in formula (I), (Ia) or (Ib) is selected from the preferred, more preferred or particularly listed groups for each variable. Therefore, this invention is intended to include all combinations of preferred, more preferred and particularly listed groups.
Specific compounds of the invention which may be mentioned are those included in the Examples and pharmaceutically acceptable salts thereof.
As used herein, unless stated otherwise, “alkyl” as well as other groups having the prefix “alk” such as, for example, alkenyl, alkynyl, and the like, means carbon chains which may be linear or branched or combinations thereof. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, sec- and tent-butyl, pentyl, hexyl, heptyl and the like. “Alkenyl”, “alkynyl” and other like terms include carbon chains having at least one unsaturated carbon-carbon bond.
The term “fluoroalkyl” includes alkyl groups substituted by one or more fluorine atoms, e.g. CH2F, CHF2 and CF3.
The term “cycloalkyl” means carbocycles containing no heteroatoms, and includes monocyclic and bicyclic saturated and partially saturated carbocycles. Examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl. Examples of partially saturated cycloalkyl groups include cyclohexene and indane. Cycloalkyl groups will typically contain 3 to 10 ring carbon atoms in total (e.g. 3 to 6, or 8 to 10).
The term “halo” includes fluorine, chlorine, bromine, and iodine atoms (in particular fluorine or chlorine).
The term “aryl” includes phenyl and naphthyl, in particular phenyl.
Unless otherwise indicated the term “heterocyclyl” and “heterocyclic ring” includes 4- to 10-membered monocyclic and bicyclic saturated rings, e.g. 4- to 7-membered monocyclic saturated rings, containing up to three heteroatoms selected from N, O and S. Examples of heterocyclic rings include oxetane, tetrahydrofuran, tetrahydropyran, oxepane, oxocane, thietane, tetrahydrothiophene, tetrahydrothiopyran, thiepane, thiocane, azetidine, pyrrolidine, piperidine, azepane, azocane, [1,3]dioxane, oxazolidine, piperazine, and the like. Other examples of heterocyclic rings include the oxidised forms of the sulfur-containing rings. Thus, tetrahydrothiophene 1-oxide, tetrahydrothiophene 1,1-dioxide, tetrahydrothiopyran 1-oxide, and tetrahydrothiopyran 1,1-dioxide are also considered to be heterocyclic rings.
Unless otherwise stated, the term “heteroaryl” includes mono- and bicyclic 5- to 10-membered, e.g. monocyclic 5- or 6-membered, heteroaryl rings containing up to 4 heteroatoms selected from N, O and S. Examples of such heteroaryl rings are furyl, thienyl, pyrrolyl, pyrazolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, triazolyl, oxadiazolyl, thiadiazolyl, tetrazolyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl and triazinyl. Bicyclic heteroaryl groups include bicyclic heteroaromatic groups where a 5- or 6-membered heteroaryl ring is fused to a phenyl or another heteroaromatic group. Examples of such bicyclic heteroaromatic rings are benzofuran, benzothiophene, indole, benzoxazole, benzothiazole, indazole, benzimidazole, benzotriazole, quinoline, isoquinoline, quinazoline, quinoxaline and purine. Preferred heteroaryl groups are monocyclic 5- or 6-membered, heteroaryl rings containing up to 4 heteroatoms selected from N, O and S.
Compounds described herein may contain one or more asymmetric centers and may thus give rise to diastereomers and optical isomers. The present invention includes all such possible diastereomers as well as their racemic mixtures, their substantially pure resolved enantiomers, all possible geometric isomers, and pharmaceutically acceptable salts thereof. The above formula (I) is shown without a definitive stereochemistry at certain positions. The present invention includes all stereoisomers of formula (I) and pharmaceutically acceptable salts thereof. Further, mixtures of stereoisomers as well as isolated specific stereoisomers are also included. During the course of the synthetic procedures used to prepare such compounds, or in using racemization or epimerization procedures known to those skilled in the art, the products of such procedures can be a mixture of stereoisomers.
When a tautomer of the compound of formula (I) exists, the present invention includes any possible tautomers and pharmaceutically acceptable salts thereof, and mixtures thereof, except where specifically drawn or stated otherwise.
When the compound of formula (I) and pharmaceutically acceptable salts thereof exist in the form of solvates or polymorphic forms, the present invention includes any possible solvates and polymorphic forms. A type of a solvent that forms the solvate is not particularly limited so long as the solvent is pharmacologically acceptable. For example, water, ethanol, propanol, acetone or the like can be used.
The term “pharmaceutically acceptable salts” refers to salts prepared from pharmaceutically acceptable non-toxic bases or acids. When the compound of the present invention is acidic, its corresponding salt can be conveniently prepared from pharmaceutically acceptable non-toxic bases, including inorganic bases and organic bases. Salts derived from such inorganic bases include aluminum, ammonium, calcium, copper (ic and ous), ferric, ferrous, lithium, magnesium, potassium, sodium, zinc and the like salts. Particularly preferred are the ammonium, calcium, magnesium, potassium and sodium salts. Salts derived from pharmaceutically acceptable organic non-toxic bases include salts of primary, secondary, and tertiary amines, as well as cyclic amines and substituted amines such as naturally occurring and synthesized substituted amines. Other pharmaceutically acceptable organic non-toxic bases from which salts can be formed include arginine, betaine, caffeine, choline, N′,N′-dibenzylethylenediamine, diethylamine, 2-diethylaminoethanol, 2-dimethylaminoethanol, ethanolamine, ethylenediamine, N-ethylmorpholine, N-ethylpiperidine, glucamine, glucosamine, histidine, hydrabamine, isopropylamine, lysine, methylglucamine, morpholine, piperazine, piperidine, polyamine resins, procaine, purines, theobromine, triethylamine, trimethylamine, tripropylamine, tromethamine and the like.
When the compound of the present invention is basic, its corresponding salt can be conveniently prepared from pharmaceutically acceptable non-toxic acids, including inorganic and organic acids. Such acids include, for example, acetic, benzenesulfonic, benzoic, camphorsulfonic, citric, ethanesulfonic, fumaric, gluconic, glutamic, hydrobromic, hydrochloric, isethionic, lactic, maleic, malic, mandelic, methanesulfonic, mucic, nitric, pamoic, pantothenic, phosphoric, succinic, sulfuric, tartaric, p-toluenesulfonic acid and the like
Since the compounds of formula (I) are intended for pharmaceutical use they are preferably provided in substantially pure form, for example at least 60% pure, more suitably at least 75% pure, especially at least 98% pure (% are on a weight for weight basis).
The compounds of formula (I) can be prepared as described below, in which Z, d, e, W, X, Y, E1 and G are as defined above, Ak is C1-3 alkyl and T is C1-2 alkyl, C1-2 alkoxy or F. The Schemes are illustrated using compounds wherein Rx is hydrogen, compounds wherein Rx is hydroxy may be prepared using analogous methods.
Compounds of formula (I) in which X is CO2, COS, or CONR2 can be prepared by condensing the appropriate acid (II) with an alcohol, thiol, or amine (III), as shown in Scheme 1 where E is O, S, or NR2, using a typical reagent for such a condensation reaction, e.g., EDCI (Pottorf, R. S.; Szeto, P. In Handbook of Reagents for Organic Synthesis: Activating Agents and Protecting Groups; Pearson, A. J., Roush, W. R., Eds.; Wiley: Chichester, 1999; pp 186-188). The acids (II) and alcohols, thiols, and amines (III) are either commercially available or are prepared easily using known techniques.
Compounds of formula (I) in which X is SCO or OCO can be prepared by condensing the appropriate thiol or alcohol (IV) with the appropriate acid (V), as shown in Scheme 2 where E is S or O, employing a reagent typically used for effecting such reactions, e.g., EDCI (Pottorf, R. S.; Szeto, P. In Handbook of Reagents for Organic Synthesis: Activating Agents and Protecting Groups; Pearson, A. J., Roush, W. R., Eds.; Wiley: Chichester, 1999; pp 186-188). The alcohols and thiols (IV), as well as acids (V), are either commercially available or are prepared straightforwardly using known techniques.
Compounds of formula (I) in which X is S or O can be prepared by alkylating the appropriate thiol or alcohol (IV) with the appropriate alkyl halide or sulfonate ester (VI), as shown in Scheme 3 where E is S or O and LG is chloro, bromo, iodo, alkanesulfonate, or arenesulfonate. The reaction is typically carried out using a base, e.g., potassium tert-butoxide (Hall, S. E., et al. J. Med. Chem. 1989, 32, 974-984). The alcohols and thiols (IV), as well as the alkyl halides or sulfonates (VI), are either commercially available or are made easily using known techniques. The compounds of formula (I) where X is SO or SO2 can easily be obtained from the compounds of formula (I) where X is S by oxidation with, for example, mCPBA (Fyfe, M. C. T. et al. International Patent Publication WO 04/72031).
Compounds of formula (I) in which W is C2-3 alkenylene can be prepared by a Wittig reaction between the appropriate phosphonium salt (VII) and the appropriate aldehyde (VIII), as indicated in Scheme 4 where m is 1 or 2 and n is 0 or 1 with the proviso that m+n<3. As an alternative, to the approach described in Scheme 4, the compounds of formula (I) in which W is C2-3 alkenylene can be prepared by a Wittig reaction between the appropriate aldehyde (IX) and the appropriate phosphonium salt (X), as indicated in Scheme 5 where q is 0 or 1 and r is 1 or 2 with the proviso that q+r<3. The reactions are carried out in the presence of a suitable base, e.g., NaOMe or LiHMDS (March, J. Advanced Organic Chemistry, 4th edn.; Wiley: New York, 1992; pp 956-963). The phosphonium salts (VII) and (X), as well as the aldehydes (VIII) and (IX), are either commercially available or are made easily using known techniques. The compounds of formula (I) where W is C2-3 alkylene can easily be synthesized from the compounds of formula (I) where W is C2-3 alkenylene by a hydrogenation reaction using, for example, palladium on charcoal as a catalyst.
Compounds of the formula (I) where W is a bond, X is S or O, and the group Z is unsubstituted or substituted by CN can be prepared by condensation of the appropriate heteroaryl halide (XI), where with the appropriate alcohol or thiol (III), as depicted in Scheme 6 where Hal represents a halogen and E is S or O. The reaction is carried out in the presence of a suitable basic system, e.g., potassium hydroxide and potassium carbonate in the presence of tris(3,6-dioxaheptyl)amine (Ballesteros, P.; Claramunt, R. M.; Elguero, J. Tetrahedron 1987, 43, 2557-2564). The heteroaryl halides (XI) and alcohols/thiols (III) are either commercially available or are made easily using known techniques.
Compounds of the formula (I) where G is NC(O)OR4, NC(O)NR4R5, NC(O)R4, or N—C(O)C(O)OR4 can be prepared by the route shown in Scheme 7, where an amine of formula (XII) is condensed with an acyl chloride of formula (XIII) where A is O, NRS, a bond, or C(O)O. The reaction is carried out in the presence of a suitable base, such as triethylamine (Picard, F., et al. J. Med. Chem. 2002, 45, 3406-3417). Compounds of the formula (I) where G is NCONR4R5 and R5 is hydrogen may also be prepared by reacting the amine (XII) with a suitable isocyanate O═C═N—R4 (Boswell, R. F., Jr., et al. J. Med. Chem. 1974, 17, 1000-1008). Compounds of the formula (I) where G is N—C1-4alkylene-C(O)OR4 may be prepared by akylating the amine (XII) with the appropriate α-haloester (Rooney, C. S. et al. J. Med. Chem. 1983, 26, 700-714). The amine (XII) is generally derived from its N-tert-butoxycarbonyl precursor (prepared by one of the routes outlined in Schemes 1-6) by deprotection with an acid, e.g., trifluoroacetic acid (Fyfe, M. C. T. et al. International Patent Publication WO 04/72031).
Compounds of the formula (I) where G is N-heteroaryl may be prepared by condensation of amine (XII) with a heteroaryl chloride of formula (XIV), as illustrated in Scheme 8 (Barillari, C. et al. Eur. J. Org. Chem. 2001, 4737-4741; Birch, A. M. et al. J. Med. Chem. 1999, 42, 3342-3355).
Compounds of the formula (I) where where the group Z is substituted by CN can be prepared from the corresponding unsubstituted Z group by the Reissert reaction (Fife, W. K. J. Org. Chem. 1983, 48, 1375-1377). Similar reactions can be used to prepare the compounds where Z is substituted by halogen (Walters, M. A.; Shay, J. J. Tetrahedron Lett. 1995, 36, 7575-7578). The compounds where Z is substituted by halogen can be transformed into the corresponding compounds where Z is substituted by C1-4 alkyl by transition metal-catalysed cross-coupling reactions (Fiirstner, A., et al. J. Am. Chem. Soc. 2002, 124, 13856-13863).
Compounds of formula (I) where Z is phenyl substituted by a 1,2,4-oxadiazole or 1,3,4-oxadiazole which is optionally substituted by C1-3 alkyl, and W is a bond and X is O, can be prepared as outlined in Scheme 9. Compounds of formula (XVII) can be preapared by reaction of compounds of formula (XV) with compounds of formula (XVI) under standard conditions, for example Mitsunobu conditions. Compounds of formula (I) where Z is phenyl substituted by a 1,2,4-oxadiazole which is optionally substituted by C1-3 alkyl can be prepared from compounds of formula (XVII) by reaction with amidoximes of formula (XVIII) (which are either commercially available, or readily prepared from the corresponding carboxylic acids using well known techniques) under standard conditions. Compounds of formula (I) where Z is phenyl substituted by a 1,3,4-oxadiazole, which is optionally substituted by C1-3 alkyl, can be prepared from compounds of formula (XVII) by initial reaction with hydrazine to form the corresponding hydrazide, under standard conditions, followed by reaction with an anhydride of formula (XIX), under standard conditions.
Compounds of formula (I) where Z is phenyl substituted by —(CH2), —C(O)NR1R11, as described above and where j is 0, and W is a bond and X is O, can be prepared as outlined in Scheme 10. Saponification of compounds of formula (XVII) under standard conditions, followed by formation of an amide bond under standard conditions well known by those with skill in the art, yields compounds of formula (I) as described above. Amino-containing amides of formula (I) may be prepared by forming the amide bond with a diamino compound where one of the amine moieties is protected by an appropriate protecting group. The free amine group is liberated by removal of the protecting group following the amide-bond forming step.
Compounds of formula (I) where Z is phenyl substituted by -E1-CO2H, as described above and where W is a bond and X is O, can be prepared as outlined in Scheme 11. Mitsunobu condensation (Org. React. 1992, 42, 335-656) of a phenol of formula (XVIII) with an alcohol of formula (XVI) affords the ester of formula (XIX). Saponification of this ester furnishes the compounds of formula (I) where Z is a phenyl substituted by -E1-CO2H.
Other compounds of formula (I) may be prepared by methods analogous to those described above or by methods known per se.
Further details for the preparation of the compounds of formula (I) are found in the examples.
The compounds of formula (I) may be prepared singly or as compound libraries comprising at least 2, for example 5 to 1,000, compounds and more preferably 10 to 100 compounds of formula (I). Compound libraries may be prepared by a combinatorial “split and mix” approach or by multiple parallel synthesis using either solution or solid phase chemistry, using procedures known to those skilled in the art.
During the synthesis of the compounds of formula (I), labile functional groups in the intermediate compounds, e.g. hydroxy, carboxy and amino groups, may be protected. The protecting groups may be removed at any stage in the synthesis of the compounds of formula (I) or may be present on the final compound of formula (I). A comprehensive discussion of the ways in which various labile functional groups may be protected and methods for cleaving the resulting protected derivatives is given in, for example, Protective Groups in Organic Chemistry, T. W. Greene and P. G. M. Wuts, (1991) Wiley-Interscience, New York, 2nd edition.
Any novel intermediates, such as those defined above, may be of use in the synthesis of compounds of formula (I) and are therefore also included within the scope of the invention, for example compounds of formula (XII):
or a salt or protected derivative thereof, wherein the groups Z, W, X, Y, Rx, d and e are as defined above for compounds of formula (I).
The processes for the production of compounds of formula (I) described above also represent further aspects of the invention.
As indicated above the compounds of formula (I) are useful as GPR119 agonists, e.g. for the treatment and/or prophylaxis of obesity and diabetes. For such use the compounds of formula (I) will generally be administered in the form of a pharmaceutical composition.
The invention also provides a compound of formula (I), or a pharmaceutically acceptable salt thereof, for use as a pharmaceutical.
The invention also provides a pharmaceutical composition comprising a compound of formula (I), in combination with a pharmaceutically acceptable carrier.
Preferably the composition is comprised of a pharmaceutically acceptable carrier and a non-toxic therapeutically effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof.
Moreover, the invention also provides a pharmaceutical composition for the treatment of disease by modulating GPR119, resulting in the prophylactic or therapeutic treatment of obesity, e.g. by regulating satiety, or for the treatment of diabetes, comprising a pharmaceutically acceptable carrier and a non-toxic therapeutically effective amount of compound of formula (I), or a pharmaceutically acceptable salt thereof.
The pharmaceutical compositions may optionally comprise other therapeutic ingredients or adjuvants. The compositions include compositions suitable for oral, rectal, topical, and parenteral (including subcutaneous, intramuscular, and intravenous) administration, although the most suitable route in any given case will depend on the particular host, and nature and severity of the conditions for which the active ingredient is being administered. The pharmaceutical compositions may be conveniently presented in unit dosage form and prepared by any of the methods well known in the art of pharmacy.
In practice, the compounds of formula (I), or pharmaceutically acceptable salts thereof, can be combined as the active ingredient in intimate admixture with a pharmaceutical carrier according to conventional pharmaceutical compounding techniques. The carrier may take a wide variety of forms depending on the form of preparation desired for administration, e.g. oral or parenteral (including intravenous).
Thus, the pharmaceutical compositions can be presented as discrete units suitable for oral administration such as capsules, cachets or tablets each containing a predetermined amount of the active ingredient. Further, the compositions can be presented as a powder, as granules, as a solution, as a suspension in an aqueous liquid, as a non-aqueous liquid, as an oil-in-water emulsion, or as a water-in-oil liquid emulsion. In addition to the common dosage forms set out above, the compound of formula (I), or a pharmaceutically acceptable salt thereof, may also be administered by controlled release means and/or delivery devices. The compositions may be prepared by any of the methods of pharmacy. In general, such methods include a step of bringing into association the active ingredient with the carrier that constitutes one or more necessary ingredients. In general, the compositions are prepared by uniformly and intimately admixing the active ingredient with liquid carriers or finely divided solid carriers or both. The product can then be conveniently shaped into the desired presentation.
The compounds of formula (I), or pharmaceutically acceptable salts thereof, can also be included in pharmaceutical compositions in combination with one or more other therapeutically active compounds.
The pharmaceutical carrier employed can be, for example, a solid, liquid, or gas. Examples of solid carriers include lactose, terra alba, sucrose, talc, gelatin, agar, pectin, acacia, magnesium stearate, and stearic acid. Examples of liquid carriers are sugar syrup, peanut oil, olive oil, and water. Examples of gaseous carriers include carbon dioxide and nitrogen.
In preparing the compositions for oral dosage form, any convenient pharmaceutical media may be employed. For example, water, glycols, oils, alcohols, flavoring agents, preservatives, coloring agents, and the like may be used to form oral liquid preparations such as suspensions, elixirs and solutions; while carriers such as starches, sugars, microcrystalline cellulose, diluents, granulating agents, lubricants, binders, disintegrating agents, and the like may be used to form oral solid preparations such as powders, capsules and tablets. Because of their ease of administration, tablets and capsules are the preferred oral dosage units whereby solid pharmaceutical carriers are employed. Optionally, tablets may be coated by standard aqueous or nonaqueous techniques.
A tablet containing the composition of this invention may be prepared by compression or molding, optionally with one or more accessory ingredients or adjuvants. Compressed tablets may be prepared by compressing, in a suitable machine, the active ingredient in a free-flowing form such as powder or granules, optionally mixed with a binder, lubricant, inert diluent, surface active or dispersing agent. Molded tablets may be made by molding in a suitable machine, a mixture of the powdered compound moistened with an inert liquid diluent. Each tablet preferably contains from about 0.05 mg to about 5 g of the active ingredient and each cachet or capsule preferably containing from about 0.05 mg to about 5 g of the active ingredient.
For example, a formulation intended for the oral administration to humans may contain from about 0.5 mg to about 5 g of active agent, compounded with an appropriate and convenient amount of carrier material which may vary from about 5 to about 95 percent of the total composition. Unit dosage forms will generally contain between from about 1 mg to about 2 g of the active ingredient, typically 25 mg, 50 mg, 100 mg, 200 mg, 300 mg, 400 mg, 500 mg, 600 mg, 800 mg, or 1000 mg.
Pharmaceutical compositions of the present invention suitable for parenteral administration may be prepared as solutions or suspensions of the active compounds in water. A suitable surfactant can be included such as, for example, hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof in oils. Further, a preservative can be included to prevent the detrimental growth of microorganisms.
Pharmaceutical compositions of the present invention suitable for injectable use include sterile aqueous solutions or dispersions. Furthermore, the compositions can be in the form of sterile powders for the extemporaneous preparation of such sterile injectable solutions or dispersions. In all cases, the final injectable form must be sterile and must be effectively fluid for easy syringability. The pharmaceutical compositions must be stable under the conditions of manufacture and storage; thus, preferably should 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 (e.g. glycerol, propylene glycol and liquid polyethylene glycol), vegetable oils, and suitable mixtures thereof.
Pharmaceutical compositions of the present invention can be in a form suitable for topical use such as, for example, an aerosol, cream, ointment, lotion, dusting powder, or the like. Further, the compositions can be in a form suitable for use in transdermal devices. These formulations may be prepared, using a compound of formula (I), or a pharmaceutically acceptable salt thereof, via conventional processing methods. As an example, a cream or ointment is prepared by admixing hydrophilic material and water, together with about 5 wt % to about 10 wt % of the compound, to produce a cream or ointment having a desired consistency.
Pharmaceutical compositions of this invention can be in a form suitable for rectal administration wherein the carrier is a solid. It is preferable that the mixture forms unit dose suppositories. Suitable carriers include cocoa butter and other materials commonly used in the art. The suppositories may be conveniently formed by first admixing the composition with the softened or melted carrier(s) followed by chilling and shaping in molds.
In addition to the aforementioned carrier ingredients, the pharmaceutical formulations described above may include, as appropriate, one or more additional carrier ingredients such as diluents, buffers, flavoring agents, binders, surface-active agents, thickeners, lubricants, preservatives (including anti-oxidants) and the like. Furthermore, other adjuvants can be included to render the formulation isotonic with the blood of the intended recipient. Compositions containing a compound of formula (I), or pharmaceutically acceptable salts thereof, may also be prepared in powder or liquid concentrate form.
Generally, dosage levels on the order of 0.01 mg/kg to about 150 mg/kg of body weight per day are useful in the treatment of the above-indicated conditions, or alternatively about 0.5 mg to about 7 g per patient per day. For example, obesity may be effectively treated by the administration of from about 0.01 to 50 mg of the compound per kilogram of body weight per day, or alternatively about 0.5 mg to about 3.5 g per patient per day.
It is understood, however, that the specific dose level for any particular patient will depend upon a variety of factors including the age, body weight, general health, sex, diet, time of administration, route of administration, rate of excretion, drug combination and the severity of the particular disease undergoing therapy.
The compounds of formula (I) may be used in the treatment of diseases or conditions in which GPR119 plays a role.
Thus the invention also provides a method for the treatment of a disease or condition in which GPR119 plays a role comprising a step of administering to a subject in need thereof an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof. Diseases or conditions in which GPR119 plays a role include obesity and diabetes. In the context of the present application the treatment of obesity is intended to encompass the treatment of diseases or conditions such as obesity and other eating disorders associated with excessive food intake e.g. by reduction of appetite and body weight, maintenance of weight reduction and prevention of rebound and diabetes (including Type 1 and Type 2 diabetes, impaired glucose tolerance, insulin resistance and diabetic complications such as neuropathy, nephropathy, retinopathy, cataracts, cardiovascular complications and dyslipidaemia). And the treatment of patients who have an abnormal sensitivity to ingested fats leading to functional dyspepsia. The compounds of the invention may also be used for treating metabolic diseases such as metabolic syndrome (syndrome X), impaired glucose tolerance, hyperlipidemia, hypertriglyceridemia, hypercholesterolemia, low HDL levels and hypertension.
The compounds of the invention may offer advantages over compounds acting via different mechanisms for the treatment of the above mentioned disorders in that they may offer beta-cell protection, increased cAMP and insulin secretion and also slow gastric emptying.
The compounds of the invention may also be used for treating conditions characterised by low bone mass such asosteopenia, osteoporosis, rheumatoid arthritis, osteoarthritis, periodontal disease, alveolar bone loss, osteotomy bone loss, childhood idiopathic bone loss, Paget's disease, bone loss due to metastatic cancer, osteolytic lesions, curvature of the spine and loss of height.
The invention also provides a method for the regulation of satiety comprising a step of administering to a subject in need thereof an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof.
The invention also provides a method for the treatment of obesity comprising a step of administering to a subject in need thereof an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof.
The invention also provides a method for the treatment of diabetes, including Type 1 and Type 2 diabetes, particularly type 2 diabetes, comprising a step of administering to a patient in need thereof an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof.
The invention also provides a method for the treatment of metabolic syndrome (syndrome X), impaired glucose tolerance, hyperlipidemia, hypertriglyceridemia, hypercholesterolemia, low HDL levels or hypertension comprising a step of administering to a patient in need thereof an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof.
The invention also provides a compound of formula (I), or a pharmaceutically acceptable salt thereof, for use in the treatment of a condition as defined above.
The invention also provides the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment of a condition as defined above.
In the methods of the invention the term “treatment” includes both therapeutic and prophylactic treatment.
The compounds of formula (I) may exhibit advantageous properties compared to known GPR119 agonists, for example, the compounds may exhibit improved potency or stability, or improved solubility thus improving absorption properties and bioavailability, or other advantageous properties, such as longer half-life, exposure or pharmacokinetic properties, for compounds to be used as pharmaceuticals.
The compounds of formula (I), or pharmaceutically acceptable salts thereof, may be administered alone or in combination with one or more other therapeutically active compounds. The other therapeutically active compounds may be for the treatment of the same disease or condition as the compounds of formula (I) or a different disease or condition. The therapeutically active compounds may be administered simultaneously, sequentially or separately.
The compounds of formula (I) may be administered with other active compounds for the treatment of obesity and/or diabetes, for example insulin and insulin analogs, gastric lipase inhibitors, pancreatic lipase inhibitors, sulfonyl ureas and analogs, biguanides, α2 agonists, glitazones, PPAR-γ agonists, mixed PPAR-α/γ agonists, RXR agonists, fatty acid oxidation inhibitors, α-glucosidase inhibitors, dipeptidyl peptidase IV inhibitors, GLP-1 agonists e.g. GLP-1 analogues and mimetics, β-agonists, phosphodiesterase inhibitors, lipid lowering agents, glycogen phosphorylase inhibitors, antiobesity agents e.g. pancreatic lipase inhibitors, MCH-1 antagonists and CB-1 antagonists (or inverse agonists), amylin antagonists, lipoxygenase inhibitors, somostatin analogs, glucokinase activators, glucagon antagonists, insulin signalling agonists, PTP1B inhibitors, gluconeogenesis inhibitors, antilypolitic agents, GSK inhibitors, galanin receptor agonists, anorectic agents, CCK receptor agonists, leptin, serotonergic/dopaminergic antiobesity drugs, reuptake inhibitors e.g. sibutramine, CRF antagonists, CRF binding proteins, thyromimetic compounds, aldose reductase inhibitors, glucocorticoid receptor antagonists, NHE-1 inhibitors or sorbitol dehydrogenase inhibitors.
Combination therapy comprising the administration of a compound of formula (I), or a pharmaceutically acceptable salt thereof, and at least one other antiobesity agent represents a further aspect of the invention.
The present invention also provides a method for the treatment of obesity in a mammal, such as a human, which method comprises administering an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof, and another antiobesity agent, to a mammal in need thereof.
The invention also provides the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, and another antiobesity agent for the treatment of obesity.
The invention also provides the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in combination with another antiobesity agent, for the treatment of obesity.
The compound of formula (I), or a pharmaceutically acceptable salt thereof, and the other antiobesity agent(s) may be co-administered or administered sequentially or separately.
Co-administration includes administration of a formulation which includes both the compound of formula (I), or a pharmaceutically acceptable salt thereof, and the other antiobesity agent(s), or the simultaneous or separate administration of different formulations of each agent. Where the pharmacological profiles of the compound of formula (I), or a pharmaceutically acceptable salt thereof, and the other antiobesity agent(s) allow it, coadministration of the two agents may be preferred.
The invention also provides the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, and another antiobesity agent in the manufacture of a medicament for the treatment of obesity.
The invention also provides a pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt thereof, and another antiobesity agent, and a pharmaceutically acceptable carrier. The invention also encompasses the use of such compositions in the methods described above.
GPR119 agonists are of particular use in combination with centrally acting antiobesity agents.
The other antiobesity agent for use in the combination therapies according to this aspect of the invention is preferably a CB-1 modulator, e.g. a CB-1 antagonist or inverse agonist. Examples of CB-1 modulators include SR141716 (rimonabant) and SLV-319 ((4S)-(−)-3-(4-chlorophenyl)-N-methyl-N-[(4-chlorophenyl)sulfonyl]-4-phenyl-4,5-dihydro-1H-pyrazole-1-carboxamide); as well as those compounds disclosed in EP576357, EP656354, WO 03/018060, WO 03/020217, WO 03/020314, WO 03/026647, WO 03/026648, WO 03/027076, WO 03/040105, WO 03/051850, WO 03/051851, WO 03/053431, WO 03/063781, WO 03/075660, WO 03/077847, WO 03/078413, WO 03/082190, WO 03/082191, WO 03/082833, WO 03/084930, WO 03/084943, WO 03/086288, WO 03/087037, WO 03/088968, WO 04/012671, WO 04/013120, WO 04/026301, WO 04/029204, WO 04/034968, WO 04/035566, WO 04/037823 WO 04/052864, WO 04/058145, WO 04/058255, WO 04/060870, WO 04/060888, WO 04/069837, WO 04/069837, WO 04/072076, WO 04/072077, WO 04/078261 and WO 04/108728, and the references disclosed therein.
Other diseases or conditions in which GPR119 has been suggested to play a role include those described in WO 00/50562 and U.S. Pat. No. 6,468,756, for example cardiovascular disorders, hypertension, respiratory disorders, gestational abnormalities, gastrointestinal disorders, immune disorders, musculoskeletal disorders, depression, phobias, anxiety, mood disorders and Alzheimer's disease.
All publications, including, but not limited to, patents and patent application cited in this specification, are herein incorporated by reference as if each individual publication were specifically and individually indicated to be incorporated by reference herein as fully set forth.
The invention will now be described by reference to the following examples which are for illustrative purposes and are not to be construed as a limitation of the scope of the present invention.
Materials and Methods
Column chromatography was carried out on SiO2 (40-63 mesh) unless specified otherwise. LCMS data were obtained as follows: Method A: Atlantis 3 μC18 column (3.0×20.0 mm, flow rate=0.85 mL/min) eluting with a H2O—CH3CN solution containing 0.1% HCO2H over 6 min with UV detection at 220 nm. Gradient information: 0.0-0.3 min 100% H2O; 0.3-4.25 min: Ramp up to 10% H2O-90% CH3CN; 4.25-4.4 min: Ramp up to 100% CH3CN; 4.4-4.9 min: Hold at 100% CH3CN; 4.9-6.0 min: Return to 100% H2O. The mass spectra were obtained using an electrospray ionisation source in either the positive (ES+) or negative (ES−) ion modes; Method B: Waters Xterra MS C18, 5 μm (4.6×50 mm, flow rate 1.5mL/min) eluting with a H2O-MeCN gradient containing 0.1% v/v ammonia over 12 min with UV detection at 215 and 254 nm. Gradient information: 0.0-8.0 min: Ramp from 95% H2O-5% MeCN to 5% H2O-95% MeCN; 8.0-9.9 min: Hold at 5% H2O-95% MeCN; 9.9-10.0 min: Return to 95% H2O-5% MeCN; 10.0-12.0 min: Hold at 95% H2O-5% MeCN. Mass spectra were obtained using an electrospray ionization source in either the positive (ES+) or negative (ES−) mode.
Abbreviations and acronyms: Ac: Acetyl; ADDP: azodicarbonyldipiperidide; Boc: tert-butoxycarbonyl; t-Bu: tert-Butyl; DBU: 1,8-Diazabicyclo[5.4.0[undec-7-ene; DCM: Dichloromethane; DEAD: Diethyl azodicarboxylate; DIAD: Diisopropyl azodicarboxylate; DIPEA: N,N-Diisopropylethylamine; DMF: Dimethylformamide; DMSO: Dimethyl sulfoxide; EDCI: 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride; Et: Ethyl; h: hour(s); min: minute/s; HOBt: 1-Hydroxybenzotriazole; IH: Isohexane; i-Pr: iso-propyl; LDA: Lithium diisopropylamide; Me: Methyl; Ph: Phenyl; RP-HPLC: Reverse phase-high performance liquid chromatography; RT: Retention time; SCX column: strong cation exchange column (silica bound tosic acid column); TFA: Trifluoroacetic acid; TBAD: di-tert-butyl azodicarboxylate; THF: Tetrahydrofuran.
The syntheses of the following compounds have been described elsewhere: 4-[3-(4-Bromo-3-fluorophenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester: WO2007/003962; (2-Fluoro-4-methoxy-phenyl)-acetic acid methyl ester: WO2007/081569; N-Hydroxyisobutyramidine: J. Org. Chem. 2003, 68, 7316-7321; 3-Piperidin-4-ylpropan-1-ol: Tetrahedron 1999, 55, 11619-11639; Methyl 2-fluoro-4-hydroxybenzoate: J. Comb. Chem. 2002, 3, 177-180; 3-Piperidin-4-yl-propyl acetate: Askew, B. et al. U.S. Pat. No. 5,559,127; tert-butyl 4-(3-hydroxypropyl)piperidine-1-carboxylate: Tetrahedron 1999, 55, 11619-11639; tert-butyl 4-((E)-2-ethoxycarbonyl-1-methylvinyl)piperidine-1-carboxylate: U.S. Pat. No. 6,518,423. All other compounds were available from commercial sources.
i-PrOCOCl (1M in PhMe, 28.1 mL, 28.1 mmol) was added to a solution of 3-piperidin-4-ylpropyl acetate (10.0 g, 54.0 mmol) and NEt3 (8.1 g, 80.2 mmol) in anhydrous DCM (100 mL) over 5 min. The reaction was stirred for 3 h, then the mixture was washed with 1M HCl (2×), saturated aqueous Na2CO3, and brine and dried (MgSO4). The solution was filtered and concentrated, before being taken up in MeOH (50 mL). 2M NaOH was added and the reaction stirred for 4 h. The MeOH was removed under reduced pressure and the remainder extracted with EtOAc. The organic extracts were dried (MgSO4), filtered and concentrated to give an oil that was purified by flash chromatography (EtOAc-DCM, 1:1) to afford the title compound: δH (CDCl3) 1.05-1.15 (m, 2H), 1.23 (d, 6H), 1.25-1.35 (m, 2H), 1.40-1.50 (m, 1H), 1.55-1.60 (m, 2H), 1.65-1.70 (m, 2H), 2.65-2.75 (m, 2H), 3.60-3.67 (m, 2H), 4.05-4.15 (br m, 2H), 4.90 (sept, 1H).
A slurry of NaHCO3 (35.2 g, 0.42 mol) in H2O (70 mL) was added to a stirred solution of 3-piperidin-4-ylpropan-1-ol (20.0 g, 0.14 mol) in DCM at 0° C. A solution of BrCN (17.8 g, 0.17 mol) in DCM (19 mL) was added to the reaction over 1 min, then stiffing was continued at 0° C. for 0.5 h. The reaction was then stirred at 20° C. for 2 h, before being washed with saturated aqueous NaHCO3 and brine. The DCM solution was dried (MgSO4), filtered and concentrated in vacuo to furnish an oil that was dissolved in a small amount of DCM, before being filtered through a SiO2 pad, eluting with EtOAc. The filtrate was concentrated under reduced pressure to afford the title compound: m/z (ES+)=169.1 [M+H]+ (Method A).
ZnCl2 (1M in Et2O, 145 mL, 145 mmol) was added over 20 min to a stirred solution of 4-(3-hydroxypropyl)piperidine-1-carbonitrile (Preparation 2, 20.3 g, 121 mmol) and N-hydroxyisobutyramidine (14.8 g, 145 mmol) in EtOAc (290 mL) and THF (270 mL). After 2 h, the white precipitate that had formed was collected and washed with THF-EtOAc (1:1, 50 mL). This precipitate was dissolved in EtOH (550 mL) and 12M HCl (70 mL), then the solution was stirred with heating to 70° C. for 16 h. The EtOH was removed in vacuo, then the remainder was diluted with H2O and adjusted to pH 7 with solid NaHCO3. The mixture was extracted with EtOAc (3×), then the combined extracts were washed with brine, before being dried (MgSO4). Filtration and solvent removal furnished the title compound: m/z (ES+)=254.1 [M+H]+ (Method A).
Methanesulfonyl chloride (1.64 mL, 21.2 mmol) in DCM (5 mL) was added dropwise to a solution of 3-[1-(3-isopropyl[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propan-1-ol (Preparation 3, 4.46 g, 17.6 mmol) and NEt3 (4.9 mL, 35.3 mmol) in DCM (35 mL) at 0° C. The reaction mixture was stirred at ambient temperature for 0.5 h, then partitioned between EtOAc (250 mL) and 0.5M HCl (150 mL). The organic layer was separated, washed with H2O, saturated aqueous NaHCO3 solution and brine, before being dried (MgSO4), filtered, and concentrated in vacuo to afford the title compound: RT=3.32 min; m/z (ES+)=332.08 [M+H]+ (Method A).
1,1,1-Triethoxyethane (3.70 mL, 19.69 mmol) was added to a solution of 4-amino-3-fluorophenol (2.50 g, 19.69 mmol) in AcOH (27.5 mL) at 75° C. and the resulting solution was heated at 75° C. for 5 h. The reaction was removed from the heat, sodium azide (4.09 g, 62.99 mmol) was added portionwise and the resulting reaction mixture was heated at 75° C. for 72 h. The reaction mixture was cooled to ambient temperature, poured into ice-water and extracted with EtOAc (10×). The combined organic extracts were dried (MgSO4), filtered and concentrated in vacuo. Purification by column chromatography (EtOAc-IH, 3:2) afforded the title compound: RT=2.50 min; m/z (ES+)=195.00 [M+H]+ (Method A).
The title compound was synthesised from methyl 2-fluoro-4-hydroxybenzoate and 4-(3-hydroxypropyl)piperidine-1-carboxylic acid isopropyl ester (Preparation 1), employing a procedure similar to that outlined in Example 1: RT=4.12 min; m/z (ES+)=382.10 [M+H]+ (Method A).
Hydrazine hydrate (80% aqueous solution, 172 μL, 2.70 mmol) was added to a solution of 4-[3-(3-fluoro-4-methoxycarbonylphenoxy)propyl]piperidine-1-carboxylic acid isopropyl ester (Preparation 6, 700 mg, 1.80 mmol) in MeOH (5 mL) and the resulting solution was heated under reflux conditions for 32 h. Further hydrazine hydrate (80% aqueous solution, 344 μL, 5.40 mmol) was added and heating under reflux conditions was continued for 72 h. The MeOH was removed in vacuo and H2O was added to the resulting solid. The solid was collected by filtration, washed with saturated aqueous NaHCO3 solution and then recrystallised from EtOH to afford the title compound: RT=3.24 min; m/z (ES+)=382.15 [M+H+ (Method A).
DIAD (20.2 mL, 102.8 mmol) was added to a stirred solution of methyl 2-fluoro-4-hydroxybenzoate (13.43 g, 79.1 mmol), 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]-propan-1-ol (Preparation 3, 20.00 g, 79.1 mmol), and PPh3 (24.85 g, 95.0 mmol) in anhydrous THF. After 30 min, the solvent was removed in vacuo, then the remainder was triturated with IH-Et2O. The solid produced was filtered and washed with Et2O. The combined washings and filtrate were concentrated under reduced pressure, then the residue was purified by column chromatography (EtOAc-IH, 1:4) to generate methyl 2-fluoro-4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}benzoate. This compound was stirred with LiOH.H2O (33.2 g, 791 mmol) in MeOH (400 mL) and H2O (100 mL) for 16 h. The MeOH was evaporated off under reduced pressure, then the remainder was partitioned between 2M NaOH and Et2O. The aqueous phase was acidified to pH 2, before being extracted with EtOAc. The organic extracts were dried (MgSO4), filtered, concentrated, and recrystallised from EtOAc to furnish the title compound: δH (CDCl3) 1.26-1.40 (m, 8H), 1.46-1.62 (m, 3H), 1.81-1.93 (m, 4H), 2.95 (sept, 1H), 3.02-3.12 (m, 2H), 4.03 (t, 2H), 4.16-4.22 (m, 2H), 6.67 (dd, 1H), 6.78 (dd, 1H), 8.01 (t, 1H); m/z (ES+)=392.0 [M+H]+ (Method A).
The title compound was synthesised by Mitsunobu condensation of 4-hydroxy-2-methylbenzoic acid methyl ester with 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]-propan-1-ol (Preparation 3), followed by saponification, employing procedures similar to those outlined in Preparation 8: δH (CDCl3) 1.26-1.40 (m, 7H), 1.46-1.62 (m, 4H), 1.81-1.92 (m, 4H), 2.64 (s, 3H), 2.94 (sept, 1H), 3.02-3.13 (m, 2H), 4.04 (t, 2H), 4.15-4.21 (m, 2H), 6.78-6.81 (m, 2H), 8.07 (d, 1H).
A solution of tert-butyl 4-((E)-2-ethoxycarbonyl-1-methylvinyl)piperidine-1-carboxylate (18.7 g, 62.9 mmol) in MeOH (90 mL) and H2O (25 mL) was treated with 2M NaOH (94.5 mL, 189 mmol). The reaction was stirred for 16 h, the MeOH was removed under reduced pressure, then the remainder was partitioned between EtOAc and H2O. The aqueous layer was separated and acidified to pH 2 with 12M HCl, before being extracted with EtOAc (2×). The organic extracts were washed with brine, dried (MgSO4), filtered, and concentrated in vacuo, then the remainder was recrystallised from EtOAc-IH to provide the title compound: m/z (ES−)=268.3 [M−H]− (Method A).
tert-Butyl 4-((E)-2-carboxy-1-methylvinyl)piperidine-1-carboxylate (Preparation 10, 130.0 g, 0.483 mol) was placed in a hydrogenation flask under an Ar atmosphere, then degassed MeOH (400 mL) was added. [Rh(norbornadiene)2]BF4 (1.80 g, 4.81 mmol) and (S)-1-[(R)-2-(di-tert-butylphosphino)ferrocenyllethylbis(2-methylphenyl)phosphine (2.90 g, 5.08 mmol) were placed in a separate Schlenk flask under Ar, before being treated with degassed MeOH (200 mL). This catalyst mixture was stirred for 15 min at ambient temperature, before being transferred via cannula into the hydrogenation flask. The Schlenk flask was rinsed with more degassed MeOH (100 mL). These washings were transferred to the hydrogenation flask, then more degassed MeOH (300 mL) was added. The hydrogenation flask was sealed, the Ar replaced by H2, and the pressure set to 1.05 bar. The reaction mixture was heated to 35° C., and stirring/shaking was started. After 48 h, the reaction was stopped and a representative sample of the reaction mixture was analysed by HPLC and 1H NMR. The conversion was 100% and the enantiomeric purity of the crude (R)-acid was 98.2%, as ascertained by the following HPLC method: Column: CHIRALPAK AD-H (previously used with CF3CO2H-containing solvents) 4.6×250 mm; Solvent: C6H14-iPrOH (97:3 isocratic); Temperature: 20° C.; Flow rate: 1 mL/min; UV-detection (210, 230 nm); Sample: 100 μL reaction solution dissolved with 1 mL MeOH. Retention times: (S)-acid: 19.3 min, (R)-acid: 20.6 min, starting enoic acid: 22.1 min. Isolation procedure: The MeOH was evaporated, then the crude hydrogenation product was dissolved in t-BuOMe and extracted with aqueous NaOH. The aqueous phase was added to a mixture of 1M HCl and EtOAc. The aqueous phase was extracted further with EtOAc, then the combined organic extracts were washed with brine and dried (MgSO4). The title compound was isolated following filtration and complete removal of the solvent.
BH3-THF (1M, 15.7 mL, 15.7 mmol) was added dropwise over 5 min to a stirred solution of tert-butyl 4-((R)-2-carboxy-1-methylethyl)piperidine-1-carboxylate (Preparation 11, 1.70 g, 6.30 mmol) in anhydrous THF at 0° C. After 1 h, the reaction was treated with Et2O, then with 2M HCl. The organic layer was washed with brine, before being dried (Na2SO4). Filtration, solvent evaporation, and column chromatography (EtOAc-DCM, 1:3) provided the title compound: RT=3.17 min; m/z (ES+)=258.1 [M+H]+ (Method A).
A mixture of tert-butyl 4-((R)-3-hydroxy-1-methylpropyl)piperidine-1-carboxylate (Preparation 12, 6.20 g, 14.9 mmol) and 4M HCl in dioxane (10 mL) were stirred at ambient temperature. After 3 h, the solvents were removed under reduced pressure to furnish the hydrochloride salt of (R)-3-piperidin-4-ylbutan-1-ol: δH ({CD3}2SO) 0.83 (d, 3H), 1.19-1.28 (m, 1H), 1.38-1.59 (m, 5H), 1.64-1.76 (m, 2H), 2.75-2.87 (m, 2H), 3.20-3.30 (m, 2H), 3.35-3.60 (m, 4H). A stirred mixture of this compound (930 mg, 4.80 mmol) and NaHCO3 (1.61 g, 19.2 mmol) in DCM-H2O (4:1, 15 mL) at 0° C. was treated with a solution of BrCN (610 mg, 5.80 mmol) in DCM (2 mL). The reaction was stirred at 20° C. for 2 h, before being partitioned between H2O and DCM. The organic phase was separated and dried (MgSO4). Filtration, solvent evaporation, and column chromatography (EtOAc) provided the title compound: RT=2.45 min; m/z (ES+)=183.1 [M+H]+ (Method A).
Condensation of 4-((R)-3-hydroxy-1-methylpropyl)piperidine-1-carbonitrile (Preparation 13, 530 mg, 2.90 mmol) with N-hydroxyisobutyramidine (360 mg, 3.50 mmol), employing a procedure similar to that outlined in Preparation 3, afforded the title compound: RT=2.92 min; m/z (ES+)=268.1 [M+H]+ (Method A).
4-Bromo-3,5-dimethylphenol (13.75 g, 68.4 mmol) and K2CO3 (18.90 g, 136.8 mmol) were added to a solution of 4-(3-methanesulfonyloxypropyl)piperidine-1-carboxylic acid tert-butyl ester (21.98 g, 68.4 mmol) in sulfolane (260 mL) and the resulting solution was heated at 85° C. for 4 h. The reaction mixture was diluted with Et2O (500 mL) and H2O (500 mL) and the organic layer was washed with H2O (4×), 2M NaOH (2×) and brine, before being dried (MgSO4). Filtration, solvent removal and purification by column chromotagraphy (DCM) furnished the title compound: RT=4.94 min; m/z (ES+)=426.20 [M+H]+ (Method A).
To a solution of 2.5 M n-butyllithium in hexane (20.64 mL, 51.6 mmol) in anhydrous THF (23 mL) at −78° C. under argon, was added a solution of 4-[3-(4-bromo-3,5-dimethyl-phenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester (Preparation 15, 11.00 g, 25.8 mmol) in anhydrous THF (34 mL). The reaction mixture was stirred at −78° C. for 50 min, then CO2 gas was bubbled through the reaction mixture as it warmed to ambient temperature (˜0.5 h). The reaction mixture was quenched with H2O and diluted with EtOAc. The organic layer was extracted with 2M NaOH (2×) and the combined basic extracts were combined with the aqueous layer. The aqueous was acidified to pH 1 with 2M HCl and extracted with EtOAc (3×), then the combined organic extracts were washed with brine and dried (MgSO4). Filtration, solvent removal and purification by column chromatography ((EtOAc-IH, 3:7)) furnished the title compound: RT=3.93 min; m/z (ES+)=392.23 [M +H]+ (Method A).
4M HCl in dioxane (21.95 mL) was added to a stirred solution of 4-[3-(4-carboxy-3,5-dimethylphenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester (Preparation 16, 4.91 g, 12.5 mmol) in dioxane (20 mL) at ambient temperature. After 2.5 h, the solid product that had formed was collected by filtration and washed with Et2O to afford the title compound: RT=2.50 min; m/z (ES+)=291.40 [M+H]+ (Method A).
To 2,6-dimethyl-4-(3-piperidin-4-ylpropoxy)benzoic acid hydrochloride (Preparation 17, 600 mg, 1.83 mmol) in DMSO (850 μL) was added 2,5-dichloropyrimidine (327 mg, 2.20 mmol), DBU (960 μL, 6.41 mmol) and H2O (6 drops). The resulting suspension was heated in a sealed tube in the microwave at 130° C. for 3 h. The reaction mixture was diluted with H2O, acidified to pH 5 with 2M HCl and extracted with EtOAc (3×), then the combined organic extracts were washed with brine, before being dried (MgSO4). Filtration, removal of solvent under reduced pressure and purification by column chromatography (EtOAc-IH, 2:3 to 3:2) afforded the title compound: RT=4.20 min; m/z (ES+)=404.16 [M+H]+ (Method A).
DIAD (8.00 mL, 40.9 mmol) was added to a stirred solution of 4-hydroxy-2-methyl-benzoic acid methyl ester (6.00 g, 37.4 mmol), tert-butyl 4-(3-hydroxypropyl)piperidine-1-carboxylate (8.25 g, 34.0 mmol) and PPh3 (10.71 g, 40.9 mmol) in anhydrous THF (60 mL) at ambient temperature. After stirring for 7.5 h, the solvent was removed in vacuo, and the remainder was dissolved in EtOAc and washed with 2M NaOH (2×) and brine. The organic layer was dried (MgSO4), concentrated under reduced pressure and the remainder was triturated with IH-Et2O. The solid produced was filtered and washed with Et2O. The combined washings and filtrate were concentrated under reduced pressure and purified by column chromatography (EtOAc-IH, 1:9) to afford the title compound: RT=4.48 min; m/z (ES+)=392.3 [M+H]+ (Method A).
To a solution of 4-[3-(4-methoxycarbonyl-3-methylphenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester (Preparation 19, 6.00 g, 15.3 mmol) in MeOH (200 mL) and H2O (20 mL) was added LiOH.H2O (6.43 g, 153.3 mmol) and the resulting mixture was stirred at 40° C. for 16 h. The MeOH was evaporated off under reduced pressure, then the remainder was dissolved in H2O (200 mL), washed with EtOAc and acidified to pH 4 with 2M HCl, before being extracted with EtOAc (2×). The combined organic extracts were washed with brine, dried (MgSO4), filtered, and concentrated in vacuo to yield the title compound RT=4.06 min; m/z (ES+)=378.22 [M+H]+ (Method A).
A mixture of 4-[3-(4-carboxy-3-methylphenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester (Preparation 20), 11.82 g, 37.7 mmol) and 4M HCl in dioxane (150 mL) was stirred at ambient temperature for 1 h. The solvent was removed in vacuo, azeotroping with toluene (2×), to afford the title compound: RT=2.37 min; m/z (ES+)=278.17 [M +H]+ (Method A).
To 2-methyl-4-(3-piperidin-4-ylpropoxy)benzoic acid hydrochloride (Preparation 21, 574 mg, 1.83 mmol) in DMSO (850 μL) was added 5-chloro-2-fluoropyridine (288 mg, 2.20 mmol), DBU (960 μL, 6.41 mmol) and H2O (6 drops). The resulting suspension was heated in a sealed tube in the microwave at 130° C. for 3 h. The reaction mixture was diluted with H2O, acidified to pH 5 with 2M HCl and extracted with EtOAc (3×), then the combined organic extracts were washed with brine, before being dried (MgSO4). Filtration, removal of solvent under reduced pressure and purification by column chromatography (EtOAc-IH, 2:3 to 3:2) afforded the title compound: RT=3.87 min; m/z (ES+)=403.11 [M+H]+ (Method A).
The title compound was prepared using a procedure similar to that outlined in Preparation 3: m/z (ES+)=268.2 [M+H]+.
The title compound was synthesised by Mitsunobu condensation of 4-hydroxy-2-methylbenzoic acid methyl ester with 3-[1-(3-tert-butyl-[1,2,4}oxadiazol-5-yl)piperidin-4-yl]-propan-1-ol (Preparation 23), followed by saponification, employing procedures similar to those outlined in Preparation 8: m/z (ES−)=400.5 [M−H]−.
Methanesulfonyl chloride (610 μL, 7.90 mmol) and NEt3 (2.01 mL, 15.0 mmol) were added to a solution of (R)-3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]butan-1-ol (Preparation 14, 2.00 g, 7.50 mmol) in DCM (30 mL) at 0° C. After stirring for 10 min, the reaction was diluted with DCM (100 mL) and poured into saturated aqueous NaHCO3 solution (100 mL). The organic layer was separated, washed with 0.1M HCl (100 mL), dried (MgSO4), filtered and concentrated in vacuo. Purification by column chromatography (EtOAc-1H, 1:1) afforded the title compound: RT=3.42 min; m/z (ES+)=346.1 M+H]+ (Method A).
A stirred solution of 1-bromo-2-bromomethyl-4-methoxybenzene (4.00 g, 14.3 mmol) in DMF (100 mL) was treated portionwise with NaN3 (4.64 g, 71.4 mmol), then the mixture was heated to 130° C. for 16 h. On cooling, the reaction mixture was partitioned between EtOAc and H2O. The aqueous phase was extracted with EtOAc, then the combined organic extracts were washed with H2O (5×), before being dried (MgSO4). Filtration and solvent evaporation furnished 2-azidomethyl-1-bromo-4-methoxybenzene: δH (CDCl3) 3.82 (s, 3H), 4.46 (s, 2H), 6.77 (dd, 1H), 6.97 (d, 1H), 7.48 (d, 1H). A stirred mixture of this aryl bromide (2.18 g, 9.0 mmol), 2-pyrrolidinone (829 μL, 10.8 mmol), trans-N,N-dimethyl-1,2-cyclohexyldiamine (142 μL, 0.9 mmol), CuI (86 mg), and K2CO3 (2.49 g, 18.0 mmol) in PhMe (10 mL) was heated under reflux for 24 h. Standard workup followed by flash chromatography (EtOAc-IH, 4:1) furnished 1-(2-azidomethyl-4-methoxyphenyl)pyrrolidin-2-one: m/z (ES+)=247.2 [M+H]+. A 0.05 M solution of this azide (50 mg, 203 μmol) in MeOH (4 mL) was reduced using an H-cube apparatus (ThalesNano Nanotechnology, Budapest, Hungary) under the following conditions: 10% Pd/C Catcart 30, 1 mL/min, full H2 mode, 20° C.). Solvent evaporation under reduced pressure yielded 1-(2-aminomethyl-4-methoxyphenyl)pyrrolidin-2-one: RF (EtOAc)=0.35. A stirred solution of this anisole (290 mg, 1.3 mmol) in 48% aqueous HBr (10 mL) was heated under reflux for 2.5 h. The mixture was concentrated under reduced pressure to furnish the hydrobromide salt of 1-(2-aminomethyl-4-hydroxyphenyl)pyrrolidin-2-one: δH (D2O) 2.29 (m, 2H), 2.99 (t, 2H), 3.95 (t, 2H), 4.71 (s, 2H), 6.66-6.67 (m, 1H), 6.78-6.81 (m, 1H), 6.91 (d, 1H). A solution of this ammonium salt (1.3 mmol) in dioxane (8 mL) and H2O (4 mL) at 0° C. was treated with Boc2O (360 mg, 1.7 mmol) and NEt3 (442 μL, 3.2 mmol), before being stirred for 1 h. The reaction mixture was partitioned between EtOAc and H2O, then the organic layer was washed with 1M citric acid, H2O, and brine, before being dried (MgSO4). Filtration and solvent evaporation provided the title compound: RT=2.62 min; m/z (ES+)=307.3 [M+H]+ (Method A).
A stirred solution of [5-hydroxy-2-(2-oxo-pyrrolidin-1-yl)benzyl]carbamic acid tert-butyl ester (Preparation 26, 125 mg, 0.41 mmol) and (R)-methanesulfonic acid-3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]butyl ester (Preparation 25, 155 mg, 0.45 mmol) in DMF (4 mL) was treated with K2CO3 (113 mg, 0.82 mmol), before being heated to 80° C. for 16 h. On cooling, the mixture was diluted with EtOAc and washed with H2O (5×), 1M citric acid, saturated aqueous NaHCO3 (2×), 1M NaOH (2×), and brine. The EtOAc solution was dried (MgSO4), filtered, and concentrated, then the residue was purified by flash chromatography (EtOAc) to afford the title compound: RT=4.03 min; m/z (ES+)=556.5 [M+H]+ (Method A).
The title compound was synthesized from 2,6-dimethyl-4-(3-piperidin-4-ylpropoxy)benzoic acid hydrochloride (Preparation 17) and 2-chloro-5-ethylpyrimidine, using a procedure similar to that delineated in Preparation 18: RT=3.95 min; m/z (ES+)=398.22 [M+H]+ (Method A).
A stirred solution of 3-piperidin-4-ylpropan-1-ol hydrochloride (15.0 g, 84 mmol) in DMSO (120 mL) was cooled to 0° C., before being treated dropwise with DBU (30.0 mL, 201 mmol) over 5 min. 2,5-dichloropyrimidine (17.4 g, 117 mmol) was added portionwise, then the reaction was heated to 110° C. for 4 h. After cooling to 20° C., the reaction was poured into H2O (200 mL) and extracted with EtOAc (3×500 mL). The combined organic extracts were washed with 1M HCl (2×200 mL), before being dried (MgSO4) and concentrated. The residue was purified by column chromatography (EtOAc-IH, 4:6) to provide the title compound: 1H NMR (CDCl3) δ1.10-1.23 (m, 2H), 1.30-1.38 (m, 2H), 1.48-1.57 (m, 1H), 1.58-1.66 (m, 2H), 1.78 (d, 2H), 2.86 (m, 2H), 3.66 (t, 2H), 4.67 (d, 2H), 8.20 (s, 2H).
A stirred solution of methyl-4-hydroxyphenylacetate (1.00 g, 6.0 mmol) and 3-[1-(5-chloropyrimidin-2-yl)piperidin-4-yl]propan-1-ol (Preparation 29, 1.53 g, 6.0 mmol) in THF (40 mL) was cooled to 0° C. ADDP (2.27 g, 9.0 mmol) and nBu3P (1.82 g, 9.0 mmol) were added portionwise and the reaction mixture was allowed to warm to 20° C. After 16 h, the reaction was concentrated and the residue treated with IH and filtered. The filtrate was concentrated and the residue purified by column chromatography (EtOAc-IH, 1:9) to provide the title compound: RT=4.85 min; m/z (ES+)=404.1 [M+H]+ (Method A).
1-(4-Hydroxy-2-methylphenyl)ethanone (9.0 g, 60 mmol), sulfur (4.8 g, 150 mmol) and morpholine (10.4 mL, 120 mmol) were heated to 135° C. for 4 h. The reaction was cooled and the residue stirred with EtOAc (200 mL) and H2O (100 mL). The liquid was decanted off and the residue washed with a further portion of EtOAc (200 mL) and H2O (100 mL). The organic layers were separated, dried (MgSO4) and concentrated. Recystallisation of the residue from MeOH (150 mL) gave a pale yellow solid which was filtered and washed with Et2O. A second crop was obtained from the filtrate and the material combined to provide the title compound: RT=2.62 min; m/z (ES+)=252.1 [M+H]+ (Method A).
Mitsunobu reaction of 2-(4-hydroxy-2-methylphenyl)-1-morpholin-4-ylethanethione (Preparation 31, 2.20 g, 8.8 mmol) and 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]-propan-1-ol (Preparation 3, 2.21 g, 8.8 mmol), by a procedure similar to that outlined in Preparation 30, provided the title compound: RT=4.50 min; m/z (ES+)=487.2 [M+H]+ (Method A).
A mixture of (2-fluoro-4-methoxyphenyl)acetic acid (4.50 g, 24.4 mmol) and aqueous hydrobromic acid (48%, 60 mL) was stirred under reflux for 12 h. The solvent was removed in vacuo and the residue was co-evaporated with MeOH several times, before being taken up in PhMe (200 mL) and MeOH (50 mL). The mixture was cooled to 0° C., before being treated with (trimethylsilyl)diazomethane (13 mL, 2 M solution in hexane). The reaction was stirred from 0° C. to ambient temperature over 1 h, then quenched with AcOH (10 mL) and concentrated in vacuo. Purification by column chromatography (IH-EtOAc, 2:1) afforded the title compound: RT=2.68 min; m/z (ES+)=248.06 [M+CH3CN+Na]+ (Method A).
(2-Fluoro-4-hydroxyphenyl)acetic acid methyl ester (Preparation 33, 747 mg, 4.05 mmol), ADDP (950 mg, 3.77 mmol) and nBu3P (1.0 mL, 4.00 mmol) were added to a solution of (R)-3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]butan-1-ol (Preparation 14, 506 mg, 1.89 mmol) in PhMe (50 mL) and the mixture was stirred at ambient temperature for 18 h. After addition of IH (100 mL), the mixture was stirred for an additional hour before being filtered. The filtrate was concentrated in vacuo to afford a residue which was purified by column chromatography (IH:EtOAc, 3:1) to give the title compound: RT=4.40 min; m/z (ES+)=434.22 [M+H]+ (Method A).
TFA (75 mL) was added to a solution of tert-butyl 4-((R)-3-hydroxy-1-methylpropyl)piperidine-1-carboxylate (Preparation 12, 30.0 g, 117 mmol) in CH2Cl2 (150 mL) at 0° C. and the resulting solution was stirred at this temperature for 0.5 h. The solvent was removed in vacuo and the remainder dissolved in CH2Cl2, then the CH2Cl2 solution was washed with saturated aqueous NaHCO3 solution, dried (MgSO4), filtered and concentrated in vacuo to afford (R)-3-piperidin-4-ylbutan-1-ol. To a portion of this material (10.0 g, 63.7 mmol) in DMSO (65 mL) was added DBU (14.3 mL, 95.5 mmol) and 2,5-dichloropyrimidine (14.3 g, 95.5 mmol) and the resulting reaction mixture was heated at 100° C. for 1.5 h. The reaction mixture was cooled to ambient temperature, quenched with H2O and extracted with EtOAc. The organic extracts were washed with 1M HCl and brine, before being dried (MgSO4), filtered and concentrated in vacuo. Purification by column chromatography (EtOAc-IH; 1:4 to 7:13) afforded the title compound: RT=3.58 min, m/z (ES+)=270.08 [[M +H]+ (Method A).
(R)-3-[1-(5-Chloropyrimidin-2-yl)piperidin-4-yl]butan-1-ol (Preparation 35) and (2-fluoro-4-hydroxyphenyl)acetic acid methyl ester (Preparation 33) were coupled under conditions similar to those of Preparation 34 to afford the title compound: RT=5.09 min; m/z (ES+)=436.15 [M+H]+ (Method A).
1-(2-Fluoro-4-hydroxyphenyl)ethanone was reacted with sulfur and morpholine, as described in Preparation 31, to provide the title compound: RT=2.63 min; m/z (ES+)=256.2 [M+H]+ (Method A).
Mitsunobu reaction of 2-(2-fluoro-4-hydroxyphenyl)-1-morpholin-4-ylethanethione (Preparation 37) and 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propan-1-ol (Preparation 3), by a procedure similar to that outlined in Preparation 30, provided the title compound: RT=4.14 min; m/z (ES+)=490.2 [M+H+ (Method A).
Mitsunobu reaction of 2-(2-fluoro-4-hydroxyphenyl)-1-morpholin-4-ylethanethione (Preparation 37) and 3-[1-(5-chloropyrimidin-2-yl)piperidin-4-yl]propan-1-ol (Preparation 29), by a procedure similar to that outlined in Preparation 30, provided the title compound: RT=4.53 min; m/z (ES+)=493.2 [M+H]+ (Method A).
Mitsunobu reaction of 2-(2-fluoro-4-hydroxyphenyl)-1-morpholin-4-ylethanethione (Preparation 37) and tert-butyl 4-(3-hydroxypropyl)piperidine-1-carboxylate, by a procedure similar to that outlined in Preparation 30, provided the title compound: RT=4.17 min; m/z (ES+)=481.11 [M+H]+ (Method A).
Mitsunobu reaction of methyl(4-hydroxyphenyl)acetate and tert-butyl 4-(3-hydroxypropyl)piperidine-1-carboxylate, by a procedure similar to that outlined in Preparation 19, provided the title compound: RT=4.24 min; m/z (ES+)=392.13 [M+H]+ (Method A).
(2-Fluoro-4-methoxyphenyl)acetic acid methyl ester (1.98 g, 10 mmol) in anhydrous THF (30 mL) was added over 15 min to a stirred solution of LDA (2.0 M in THF/Heptane/PhMe, 6 mL, 12 mmol) at −78° C. The reaction was stirred for 1.5 h at −78° C., after which MeI (0.76 mL, 12 mmol) was added. After stirring at −78° C. for a further 2 h, the reaction was allowed to warm to −10° C. and stirred at this temperature for 16 h. Saturated aqueous NH4Cl (200 mL) and EtOAc (400 mL) were added to the reaction and the organic layer was separated. The aqueous phase was extracted with further EtOAc (400 mL), then the combined organic extracts were washed with brine (500 mL), before being dried (MgSO4), filtered and concentrated. The residue was purified by column chromatography (EtOAc-IH, 1:4) to provide the title compound: δH (CDCl3) 1.48 (d, 3H), 3.68 (s, 3H), 3.78 (s, 3H), 3.96 (q, 1H), 6.62 (dd, 1H), 6.68 (dd, 1H), 7.19 (t, 1H).
(2-Fluoro-4-methoxyphenyl)propionic acid methyl ester (Preparation 42, 1.97 g, 9.29 mmol) in HBr (48%, 50 mL) was heated to 160° C. with stirring for 16 h. The reaction mixture was cooled and concentrated, then the residue was redissolved in MeOH (50 mL). 12M HCl (1 drop) was added, then the reaction was heated to 80° C. for 16 h, after which time it was concentrated. The residue was purified by column chromatography (EtOAc-IH, 1:4) to provide the title compound: RT=2.98 min; m/z (ES−)=197.1 [M−H]− (Method A).
Mitsunobu reaction of 2-(2-fluoro-4-hydroxyphenyl)propionic acid methyl ester (Preparation 43) and 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propan-1-ol (Preparation 3), by a procedure similar to that outlined in Preparation 30, provided the title compound: RT=4.54 min; m/z (ES+)=434.2 [M+H]+ (Method A).
3-Piperidin-4-yl-propan-1-ol was reacted with 2-chloro-5-ethylpyrimidine, employing a procedure similar to that used for the synthesis of Preparation 29, to furnish the title compound: m/z (ES+)=250.15 [M+H]+.
3-[1-(5-Ethylpyrimidin-2-yl)piperidin-4-yl]propan-1-ol (Preparation 45) was reacted with methanesulfonyl chloride, utilising a procedure similar to that outlined in Preparation 25, to give the title compound: m/z (ES+)=328.18 [M+H]+.
Using a procedure similar to that outlined in Preparation 27, 6-chloropyridin-3-ol was condensed with methanesulfonic acid 3-[1-(5-ethylpyrimidin-2-yl)piperidin-4-yl]propyl ester (Preparation 46) to afford the title compound: RT=4.20 min; m/z (ES+)=361.15 [M+H]+ (Method A).
(R)-3-[1-(5-Chloropyrimidin-2-yl)piperidin-4-yl]butan-1-ol (Preparation 35) and 3-(4-hydroxy-2-methylphenyl)propionic acid ethyl ester were coupled under conditions similar to those of Preparation 34 to afford the title compound: m/z (ES+)=460.2 [M+H]+.
DIAD (335 μL, 1.70 mmol) was added to a stirred solution of 3-fluoro-4-(5-methyl-tetrazol-1-yl)phenol (Preparation 5, 150 mg, 773 μmol), tert-butyl 4-(3-hydroxypropyl)piperidine-1-carboxylate (207 mg, 850 μmol) and PPh3 (264 mg, 1.00 mmol) in THF (7 mL) at 0° C. and the resulting solution was stirred at ambient temperature for 3.5 h. Further PPh3 (80 mg, 309 μmol) was added, stirring at ambient temperature was continued for 1.5 h and then the reaction mixture was concentrated in vacuo. Purification by RP-HPLC afforded the title compound: RT=4.13 min; m/z (ES+)=420.14 [M+H]+ (Method A).
NaH (60%, 24.0 mg, 572 μmol, washed with IH) was added to a solution of N-hydroxy-acetamidine (40.0 mg, 630 μmol) in THF (4 mL) and the resulting solution stirred at ambient temperature for 10 min. 4-[3-(3-fluoro-4-methoxycarbonylphenoxy)propyl]piperidine-1-carboxylic acid isopropyl ester (Preparation 6, 200 mg, 520 μmol) in THF (4 mL) was added and the resulting solution was stirred at ambient temperature for 20 h. The reaction was quenched with H2O, diluted with EtOAc and the organic layer washed with brine, dried (MgSO4), filtered and concentrated in vacuo. Purification by column chromatography (EtOAc-IH, 1:9 to 1:4) afforded the title compound: RT=4.09 min; m/z (ES+)=406.10 [M+H]+ (Method A).
The title compound was synthesized from N-hydroxypropionamidine and 4-[3-(3-fluoro-4-methoxycarbonylphenoxy)propyl]piperidine-1-carboxylic acid isopropyl ester (Preparation 6) employing a procedure similar to that outlined in Example 2: RT=4.31 min; m/z (ES+)=420.10 [M +H]+ (Method A).
Acetic anhydride (50.0 μL, 520 μmol) was added to a solution of 4-[3-(3-fluoro-4-hydrazinocarbonylphenoxy)propyl]piperidine-1-carboxylic acid isopropyl ester (Preparation 7, 100 mg, 260 μmol) in pyridine (2 mL) at 0° C. and the resulting solution was stirred at ambient temperature for 72 h. The solvent was removed in vacuo to afford crude 4-{3-[4-(N′-acetyl-hydrazinocarbonyl)-3-fluorophenoxy]propyl}piperidine-1-carboxylic acid isopropyl ester which was heated under reflux conditions with P2O5 (205 mg, 1.44 mmol) in toluene (4 mL) for 6 h. The reaction mixture was cooled, poured into H2O, basified with 1M NaOH and then extracted with EtOAc. The combined organic extracts were washed with H2O, brine, dried (MgSO4), filtered and concentrated in vacuo. Purification by RP-HPLC afforded the title compound: RT=3.86 min; m/z (ES+)=406.09 [M +H]+ (Method A).
A mixture of 4-(5-methyl-[1,2,4]oxadiazol-3-yl)phenol (74.0 mg, 418 μmol) and K2CO3 (72.0 mg, 522 μmol) in anhydrous DMSO (0.5 mL) was stirred at ambient temperature for 10 mins, where after a solution of methanesulfonic acid 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)-piperidin-4-yl]propyl ester (Preparation 4, 115 mg, 348 μmol) in DMSO (1 mL) was added. The reaction mixture was stirred at ambient temperature for 48 h, diluted with DCM (10 mL), washed with H2O and brine, dried (MgSO4), filtered and concentrated in vacuo. Purification by RP-HPLC afforded the title compound: RT=4.731 min; m/z (ES+)=412.1 [M+H]+ (Method B).
The compounds listed in Table 1 were synthesised from methanesulfonic acid 3-[1-3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propyl ester (Preparation 4) and the appropriate phenol, employing a procedure similar to that outlined in Example 5.
HOBt.H2O (91.0 mg, 672 μmol) and EDCI (129 mg, 672 μmol) were added to a stirred solution of 4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}-2-methylbenzoic acid (Preparation 9, 200 mg, 517 μmol) in THF (12 mL). After 0.5 h, (R)-1-pyrrolidin-2-ylmethylcarbamic acid tert-butyl ester (207 mg, 1.033 mmol) was added and the resulting mixture was stirred at ambient temperature for 16 h. The THF was removed in vacuo and the residue was partitioned between EtOAc and 2M NaOH. The organic phase was separated and washed with 2M NaOH, 1M HCl and brine, before being dried (MgSO4). Filtration, solvent evaporation, and purification by column chromatography ((EtOAc-IH, 1:1 to 1:0) afforded [(R)-1-(4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}-2-methylbenzoyl)-pyrrolidin-2-ylmethyl]carbamic acid tert-butyl ester: RT=4.10 min; m/z (ES+)=570.39 [M+H]+ (Method A). To a stirred solution of this compound in dioxane (5 mL) was added 4M HCl in dioxane (1.08 mL, 4.29 mmol) and the resulting solution was stirred at ambient temperature for 5 h. The solvent was removed in vacuo and the remainder was dissolved in H2O and washed with EtOAc. The aqueous was basified to pH 12 with 2M NaOH and extracted with EtOAc (3×). The combined organic extracts were dried (MgSO4), filtered and concentrated in vacuo to afford the title compound: RT=2.97 min; m/z (ES+)=470.31 [M+H]+ (Method A).
HOBt.H2O (43.0 mg, 320 μmol) and EDCI (61.0 mg, 320 μmol) were added to a stirred solution of 2-fluoro-4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}benzoic acid (Preparation 8, 100 mg, 258 μmol) in THF (3 mL). After 1 h, (R)-piperidin-3-ylcarbamic acid tert-butyl ester (102 mg, 512 μmol) was added and the resulting mixture was stirred at ambient temperature for 4 h. The THF was removed in vacuo and the residue was partitioned between DCM and 2M NaOH. The organic phase was separated and washed with 2M NaOH and 1M HCl. Solvent evaporation afforded [(R)-1-(4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)-piperidin-4-yl]propoxy}-2-methylbenzoyl)piperidin-3-yl]carbamic acid tert-butyl ester. To a stirred solution of this compound in DCM (10 mL) was added trifluoroacetic acid (200 μL) and the resulting solution was stirred at ambient temperature for 2 h before quenching with saturated aqueous NaHCO3 solution. The organic layer was separated and loaded onto a 2 g SCX column and washed with Me OH. Elution with 1% ammonia in MeOH afforded a crude product which was further purified by column chromotagraphy (DCM-NEt3, 999:1 to DCM-MeOH-NEt3, 89:10:1 to afford the title compound: RT=2.47 min; m/z (ES+)=474.06 [M+H]+ (Method B).
The amides listed in Table 2 were synthesised by condensing the appropriate acid with the appropriate Boc protected amine, followed by Boc deprotection, employing procedures similar to those outlined in Example 10.
The amides listed in Table 3 were also synthesised by condensing the appropriate acid with the appropriate Boc protected amine, followed by Boc deprotection, employing procedures similar to those outlined in Example 10.
The amides listed in Table 4 were synthesised by condensing the appropriate acid with an appropriate amine, employing an amide-forming reaction similar to that employed for the synthesis of Example 10.
To a solution of 4-[3-(4-bromo-3-fluorophenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester in 1,4-dioxane (4 mL) was added 1-methylimidazolidin-2-one (120 mg, 1.20 mmol), CuI (34.0 mg, 180 μmol), N,N′-dimethylethane-1,2-diamine (15.3 mg, 174 μmol) and K2CO3 (299 mg, 2.16 mmol) and the resulting reaction mixture was heated under microwave irradiation at 140° C. for 4 h. The reaction mixture was diluted with EtOAc and H2O, then the aqueous was separated and extracted with EtOAc (2 ×). The combined organic extracts were washed with brine, dried (MgSO4), filtered and concentrated in vacuo. Purification by column chromatography (EtOAc-IH, 3:2) afforded the title compound: RT=3.89 min; m/z (ES+)=436.12 [M +H]+ (Method A).
To a solution of 6-hydroxy-3,4-dihydro-1H-quinolin-2-one (164 mg, 1.10 mmol) in THF (10 mL) was added tert-butyl 4-(3-hydroxypropyl)piperidine-1-carboxylate (243 mg, 1.00 mmol) and PPh3 (341 mg, 1.30 mmol). The resulting reaction mixture was cooled to 0° C. prior to the addition of DIAD (433 μL, 2.20 mmol). The reaction mixture was stirred at ambient temperature for 4 h, then the solvent was removed in vacuo. The remainder was triturated with Et2O/IH and the PPh3O removed by filtration. The filtrate was concentrated in vacuo and purified by column chromatography (EtOAc-IH, 1:9) to afford the title compound: RT=3.76 min; m/z (ES+)=389.17 [M+H]+ (Method A).
To a solution of 5-hydroxy-2,3-dihydroisoindol-1-one (100 mg, 671 μmol) in THF (7 mL) and DMF (2 mL) was added 3-[1-(3-isopropyl[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propan-1-ol (Preparation 3, 165 mg, 652 μmol) and PPh3 (444 mg, 1.67 mmol). The resulting reaction mixture was cooled to 0° C. prior to the addition of DIAD (564 μL, 2.86 mmol). The reaction mixture was stirred at ambient temperature for 1.5 h, then the solvent was removed in vacuo. The reaction mixture was diluted with EtOAc (50 mL), washed with 2M NaOH (20 mL), H2O (20 mL) and brine (20 mL), dried (MgSO4), filtered and concentrated in vacuo. Purification by column chromatography (EtOAc-IH, 3:2 to 7:3 to 1:0) afforded the title compound: RT=3.47 min; m/z (ES+)=385.04 [M+H]+ (Method A).
The title compound was synthesized from (R)-3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]butan-1-ol (Preparation 14) employing a procedure similar to that outlined in Example 47: RT=3.65 min; m/z (ES+)=399.3 [M+H+ (Method A).
The compounds listed in Table 5 were synthesised employing the following general synthetic route:
A mixture of the appropriate phenol (237 μmol) and potassium tert-butoxide (33.3 mg, 296 μmol) in anhydrous DMSO (0.5 mL) was stirred at ambient temperature for 10 min followed by the addition of a solution of methanesulfonic acid 3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propyl ester (Preparation 4, 65.5 mg, 198 μmol) in DMSO (0.5 mL). The resulting reaction mixture was stirred at ambient temperature for 2 h and then at 60° C. for 16 h. The reaction mixture was diluted with DCM (10 mL), washed sequentially with H2O and brine and then evaporated under reduced pressure. The crude product was purified by preparative HPLC.
TFA (0.95 mL) was added to a stirred solution of [5-{(R)-3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]butoxy}-2-(2-oxo-pyrrolidin-1-yl)benzyl]carbamic acid tert-butyl ester (Preparation 27, 153 mg, 275 μmol) in DCM (4.7 mL) at 0° C. After 2 h, the reaction was quenched with saturated aqueous NaHCO3, then stirring was continued for a further 10 min. The mixture was treated with additional DCM, then the organic phase was washed with H2O and brine, before being dried (MgSO4), filtered and concentrated to afford the title compound: RT=2.84 min; m/z (ES+)=456.5 [M+H]+ (Method A).
(4-{3-[1-(5-Chloropyrimidin-2-yl)piperidin-4-yl]propoxy}phenyl)acetic acid methyl ester (Preparation 30, 370 mg, 0.92 mmol), LiOH.H2O (77 mg, 1.83 mmol), THF (10 mL) and H2O (5 mL) were stirred at 20° C. for 16 h. The THF was removed in vacuo and the residue acidified with 2M HCl, then H2O (10 mL) and CH2Cl2 (40 mL) were added. The organic layer was separated and concentrated to give the title compound: RT=4.34 min; m/z (ES+)=390.1 [M+H]+ (Method A).
A stirred solution of 2-(4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]-propoxyl-2-methylphenyl)-1-morpholin-4-ylethanethione (Preparation 32, 3.3 g, 6.8 mmol), 10% aqueous NaOH (200 mL) and MeOH (200 mL) was heated to 90° C. for 4 h. The MeOH was removed in vacuo and the pH adjusted to 3-4 with 12M HCl. EtOAc (200 mL) was added and the organic layer separated. The aqueous layer was extracted further with EtOAc (200 mL) and the combined organic extracts were dried (MgSO4), filtered and concentrated to provide the title compound: RT=3.88 min; m/z (ES+)=402.2 [M+H]+ (Method A).
(2-Fluoro-4-{(R)-3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]butoxy}phenyl)acetic acid methyl ester (Preparation 34) was saponified, using a procedure similar to that outlined in Example 55, to yield the title compound: RT=4.05 min; m/z (ES+)=420.21 [M +H]+ (Method A).
(4-{(R)-3-[1-(5-Chloropyrimidin-2-yl)piperidin-4-yl]butoxy}-2-fluorophenyl)acetic acid methyl ester (Preparation 36) was saponified, using a procedure similar to that outlined in Example 55, to yield the title compound: RT=4.57 min; m/z (ES+)=422.13 [M+H]+ (Method A).
2-(2-Fluoro-4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}-phenyl)-1-morpholin-4-ylethanethione (Preparation 38) was reacted with NaOH, utilizing a procedure similar to that outlined in Example 56, to afford the title compound: RT=3.73 min; m/z (ES+)=406.2 [M +H]+ (Method A).
2-(4-{3-[1-(5-Chloropyrimidin-2-yl)piperidin-4-yl]propoxy}-2-fluorophenyl)-1-morpholin-4-ylethanethione (Preparation 39) was reacted with NaOH, utilizing a procedure similar to that outlined in Example 56, to afford the title compound: RT=4.14 min; m/z (ES+)=408.2 [M+H]+ (Method A).
4-{3-[3-Fluoro-4-(2-morpholin-4-yl-2-thioxoethyl)phenoxy]propyl}piperidine-1-carboxylic acid tert-butyl ester (Preparation 40) was reacted with NaOH, utilizing a procedure similar to that outlined in Example 56, to afford the title compound: RT=3.84 min; m/z (ES+)=396.11 [M+H]+ (Method A).
2M NaOH (2.5 mL, 5 mmol) was added to a stirred solution of 4-[3-(4-methoxycarbonylmethylphenoxy)propyl]piperidine-1-carboxylic acid tert-butyl ester (Preparation 41, 470 mg, 1.2 mmol) in MeOH (7 mL). After 1 h, the MeOH was removed under reduced pressure, then H2O was added along with sufficient saturated aqueous NaHCO3 to adjust the pH to 10. The solution was washed with Et2O (50 mL), then the aqueous phase was acidified to pH 2 with 12M HCl. The mixture was extracted with EtOAc (50 mL), then the EtOAc extracts were washed with brine (5 mL) and dried (MgSO4). Filtration and solvent evaporation furnished the title compound: RT=3.76 min; m/z (ES+)=378.14 [M+H]+ (Method A).
2-(2-Fluoro-4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}-phenyl)propionic acid methyl ester (Preparation 44) was saponified, using a procedure similar to that outlined in Example 55, to yield the title compound: RT=4.07 min; m/z (ES+)=420.2 [M+H]+ (Method A).
The amides listed in Table 6 were synthesised by condensing 2-(2-fluoro-4-{3-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)piperidin-4-yl]propoxy}phenyl)propionic acid (Example 63) with an appropriate amine, employing an amide-forming reaction similar to that employed for the synthesis of Example 10.
A mixture of piperazine-2-one (42 mg, 420 μmol), 2-{4-[3-(6-chloropyridin-3-yloxy)-propyl]piperidin-1-yl}-5-ethylpyrimidine (Preparation 47, 100 mg, 278 μmol), NaOtBu (67 mg, 698 μmol), 1,1 bis(di-tert-butylphosphino)ferrocene palladium dichloride (15 mg, 23 μmol), and PhMe (3 mL) was heated to 120° C. for 30 min under microwave irradiation. On cooling to ambient temperature, the reaction mixture was partitioned between EtOAc (40 mL) and 10% aqueous citric acid (40 mL). The aqueous phase was carefully neutralized with saturated aqueous NaHCO3, before being extracted with EtOAc (2×30 mL). The combined organic layers were dried (MgSO4), filtered, and concentrated to give a residue that was triturated with Et2O (3×20 mL) to furnish the title compound: RT=2.73 min; m/z (ES+)=425.26 [M+H]+ (Method A).
3-(4-{(R)-3-[1-(5-Chloropyrimidin-2-yl)piperidin-4-yl]butoxy}-2-methylphenyl)-propionic acid ethyl ester (Preparation 48) was saponified, using a procedure similar to that outlined in Preparation 20, to furnish the title compound: RT=4.68 min; m/z (ES+)=432.19 [M+H]+ (Method A).
The biological activity of the compounds of the invention may be tested in the following assay systems:
The yeast cell-based reporter assays have previously been described in the literature (e.g. see Miret J. J. et al, 2002, J. Biol. Chem., 277:6881-6887; Campbell R. M. et al, 1999, Bioorg. Med. Chem. Lett., 9:2413-2418; King K. et al, 1990, Science, 250:121-123); WO 99/14344; WO 00/12704; and U.S. Pat. No. 6,100,042). Briefly, yeast cells have been engineered such that the endogenous yeast G-alpha (GPA1) has been deleted and replaced with G-protein chimeras constructed using multiple techniques. Additionally, the endogenous yeast GPCR, Ste3 has been deleted to allow for heterologous expression of a mammalian GPCR of choice. In the yeast, elements of the pheromone signaling transduction pathway, which are conserved in eukaryotic cells (for example, the mitogen-activated protein kinase pathway), drive the expression of Fus1. By placing β-galactosidase (LacZ) under the control of the Fus1 promoter (Fus1p), a system has been developed whereby receptor activation leads to an enzymatic read-out.
Yeast cells were transformed by an adaptation of the lithium acetate method described by Agatep et al, (Agatep, R. et al, 1998, Transformation of Saccharomyces cerevisiae by the lithium acetate/single-stranded carrier DNA/polyethylene glycol (LiAc/ss-DNA/PEG) protocol. Technical Tips Online, Trends Journals, Elsevier). Briefly, yeast cells were grown overnight on yeast tryptone plates (YT). Carrier single-stranded DNA (10 μg), 2 μg of each of two Fus1p-LacZ reporter plasmids (one with URA selection marker and one with TRP), 2 μg of GPR119 (human or mouse receptor) in yeast expression vector (2 μg origin of replication) and a lithium acetate/polyethylene glycol/TE buffer was pipetted into an Eppendorf tube. The yeast expression plasmid containing the receptor/no receptor control has a LEU marker. Yeast cells were inoculated into this mixture and the reaction proceeds at 30° C. for 60 min. The yeast cells were then heat-shocked at 42° C. for 15 min. The cells were then washed and spread on selection plates. The selection plates are synthetic defined yeast media minus LEU, URA and TRP (SD-LUT). After incubating at 30° C. for 2-3 days, colonies that grow on the selection plates were then tested in the LacZ assay.
In order to perform fluorimetric enzyme assays for β-galactosidase, yeast cells carrying the human or mouse GPR119 receptor were grown overnight in liquid SD-LUT medium to an unsaturated concentration (i.e. the cells were still dividing and had not yet reached stationary phase). They were diluted in fresh medium to an optimal assay concentration and 90 μl of yeast cells added to 96-well black polystyrene plates (Costar). Compounds, dissolved in DMSO and diluted in a 10% DMSO solution to 10× concentration, were added to the plates and the plates placed at 30° C. for 4 h. After 4 h, the substrate for the I3-galactosidase was added to each well. In these experiments, Fluorescein di (β-D-galactopyranoside) was used (FDG), a substrate for the enzyme that releases fluorescein, allowing a fluorimetric read-out. 20 μl per well of 500 μM FDG/2.5% Triton X100 was added (the detergent was necessary to render the cells permeable). After incubation of the cells with the substrate for 60 min, 20 μl per well of 1M sodium carbonate was added to terminate the reaction and enhance the fluorescent signal. The plates were then read in a fluorimeter at 485/535 nm.
The compounds of the invention give an increase in fluorescent signal of at least ˜1.5-fold that of the background signal (i.e. the signal obtained in the presence of 1% DMSO without compound). Compounds of the invention which give an increase of at least 5-fold may be preferred.
cAMP Assay
A stable cell line expressing recombinant human GPR119 was established and this cell line may be used to investigate the effect of compounds of the invention on intracellular levels of cyclic AMP (cAMP). The cell monolayers are washed with phosphate buffered saline and stimulated at 37° C. for 30 min with various concentrations of compound in stimulation buffer plus 1% DMSO. Cells are then lysed and cAMP content determined using the Perkin Elmer AlphaScreen™ (Amplified Luminescent Proximity Homogeneous Assay) cAMP kit. Buffers and assay conditions are as described in the manufacturer's protocol.
The effect of compounds of the invention on body weight and food and water intake may be examined in freely-feeding male Sprague-Dawley rats maintained on reverse-phase lighting. Test compounds and reference compounds are dosed by appropriate routes of administration (e.g. intraperitoneally or orally) and measurements made over the following 24 h. Rats are individually housed in polypropylene cages with metal grid floors at a temperature of 21±4° C. and 55±20% humidity. Polypropylene trays with cage pads are placed beneath each cage to detect any food spillage. Animals are maintained on a reverse phase light-dark cycle (lights off for 8 h from 09.30-17.30 h) during which time the room was illuminated by red light Animals have free access to a standard powdered rat diet and tap water during a two week acclimatization period. The diet is contained in glass feeding jars with aluminum lids. Each lid had a 3-4 cm hole in it to allow access to the food Animals, feeding jars and water bottles are weighed (to the nearest 0.1 g) at the onset of the dark period. The feeding jars and water bottles are subsequently measured 1, 2, 4, 6 and 24 h after animals are dosed with a compound of the invention and any significant differences between the treatment groups at baseline compared to vehicle-treated controls.
HIT-T15 cells (passage 60) were obtained from ATCC, and were cultured in RPMI1640 medium supplemented with 10% fetal calf serum and 30 nM sodium selenite. All experiments were done with cells at less than passage 70, in accordance with the literature, which describes altered properties of this cell line at passage numbers above 81 (Zhang H J, Walseth T F, Robertson R P. Insulin secretion and cAMP metabolism in HIT cells. Reciprocal and serial passage-dependent relationships. Diabetes. 1989 January; 38(1):44-8).
cAMP Assay
HIT-T15 cells were plated in standard culture medium in 96-well plates at 100,000 cells/0.1 ml/well and cultured for 24 hr and the medium was then discarded. Cells were incubated for 15 min at room temperature with 100 μl stimulation buffer (Hanks buffered salt solution, 5 mM HEPES, 0.5 mM IBMX, 0.1% BSA, pH 7.4). This was discarded and replaced with compound dilutions over the range 0.001, 0.003, 0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30 μM in stimulation buffer in the presence of 0.5% DMSO. Cells were incubated at room temperature for 30 min. Then 75 ul lysis buffer (5 mM HEPES, 0.3% Tween-20, 0.1% BSA, pH 7.4) was added per well and the plate was shaken at 900 rpm for 20 min. Particulate matter was removed by centrifugation at 3000 rpm for 5 min, then the samples were transferred in duplicate to 384-well plates, and processed following the Perkin Elmer AlphaScreen cAMP assay kit instructions. Briefly 25 μl reactions were set up containing 8 μl sample, 5 μl acceptor bead mix and 12 μl detection mix, such that the concentration of the final reaction components is the same as stated in the kit instructions. Reactions were incubated at room temperature for 150 min, and the plate was read using a Packard Fusion instrument. Measurements for cAMP were compared to a standard curve of known cAMP amounts (0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30, 100, 300, 1000 nM) to convert the readings to absolute cAMP amounts. Data was analysed using XLfit 3 software.
Representative compounds of the invention were found to increase cAMP at an EC50 of less than 10 μM. Compounds showing an EC50 of less than 1 μM in the cAMP assay may be preferred.
HIT-T15 cells are plated in standard culture medium in 12-well plates at 106 cells/1 ml/well and cultured for 3 days and the medium then discarded. Cells are washed×2 with supplemented Krebs-Ringer buffer (KRB) containing 119 mM NaCl, 4.74 mM KCl, 2.54 mM CaCl2, 1.19 mM MgSO4, 1.19 mM KH2PO4, 25 mM NaHCO3, 10 mM HEPES at pH 7.4 and 0.1% bovine serum albumin. Cells are incubated with 1 ml KRB at 37° C. for 30 min which is then discarded. This is followed by a second incubation with KRB for 30 min, which is collected and used to measure basal insulin secretion levels for each well. Compound dilutions (0, 0.1, 0.3, 1, 3, 10 uM) are then added to duplicate wells in 1 ml KRB, supplemented with 5.6 mM glucose. After 30 min incubation at 37° C. samples are removed for determination of insulin levels. Measurement of insulin is done using the Mercodia Rat insulin ELISA kit, following the manufacturers instructions, with a standard curve of known insulin concentrations. For each well insulin levels are corrected by subtraction of the basal secretion level from the pre-incubation in the absence of glucose. Data was analysed using XLfit 3 software.
The effects of compounds of the invention on oral glucose (Glc) tolerance were evaluated in male Sprague-Dawley rats. Food was withdrawn 16 h before administration of Glc and remained withdrawn throughout the study. Rats had free access to water during the study. A cut was made to the animals' tails, then blood (1 drop) was removed for measurement of basal Glc levels 60 min before administration of the Glc load. Then, the rats were weighed and dosed orally with test compound or vehicle (20% aqueous hydroxypropyl-β-cyclodextrin) 45 min before the removal of an additional blood sample and treatment with the Glc load (2 g kg−1 p.o.). Blood samples were then taken from the cut tip of the tail 5, 15, 30, 60, 120, and 180 min after Glc administration. Blood glucose levels were measured just after collection using a commercially available glucose-meter (OneTouch® Ultra™ from Lifescan). Representative compounds of the invention statistically reduced the Glc excursion at doses of ≦10 mg kg−1.
The effects of compounds of the invention on oral glucose (Glc) tolerance may also evaluated in male C57B1/6 or male ob/ob mice. Food is withdrawn 5 h before administration of Glc and remained withdrawn throughout the study. Mice have free access to water during the study. A cut is made to the animals' tails, then blood (20 μL) is removed for measurement of basal Glc levels 45 min before administration of the Glc load. Then, the mice are weighed and dosed orally with test compound or vehicle (20% aqueous hydroxypropyl-β-cyclodextrin or 25% aqueous Gelucire 44/14) 30 min before the removal of an additional blood sample (20 μL) and treatment with the Glc load (2-5 g kg−1 p.o.). Blood samples (20 μL) are then taken 25, 50, 80, 120, and 180 min after Glc administration. The 20 μL blood samples for measurement of Glc levels are taken from the cut tip of the tail into disposable micro-pipettes (Dade Diagnostics Inc., Puerto Rico) and the sample added to 480 μL of haemolysis reagent. Duplicate 20 μL aliquots of the diluted haemolysed blood are then added to 180 μL of Trinders glucose reagent (Sigma enzymatic (Trinder) colorimetric method) in a 96-well assay plate. After mixing, the samples are left at rt for 30 min before being read against Glc standards (Sigma glucose/urea nitrogen combined standard set).
| Number | Date | Country | Kind |
|---|---|---|---|
| 0812648.4 | Jul 2008 | GB | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/GB2009/050830 | 7/10/2009 | WO | 00 | 4/21/2011 |
