Patent Grant
8227601
This application concerns certain 2-phenylamino-6-aryl amino-, 6-aryloxy-, and 6-arylthio -purines, -azapurines and -deazapurines. These compounds are non-nucleoside reverse transcriptase inhibitors and have potential as anti-HIV treatment.
Human Immunodeficiency Virus (HIV) presents a public-health and social catastrophe too well known to require documentation. One therapeutic approach to HIV has been inhibition of the viral RNA-dependent RNA polymerase; this enzyme is frequently referred to as “reverse transcriptase,” abbreviated “RT.” The first RT inhibitors were nucleoside analogs such as AZT and ddI. Although such nucleoside RT inhibitors were frequently effective against the wild-type virus, any single-drug treatment has been hobbled by the virus's ability to readily produce drug-resistant mutants. This has led to an intense search for non-nucleoside RT inhibitors (“NNRTIs”) which are both effective and capable of retaining their effectiveness despite drug-resistance mutations. A recent review of NNRTIs can be found Balzarni, J., 2004, Cur. Top. Med. Chem. 4, 921-44 (Erratum ibid. 4, 1825).
Four leading NNRTI are: 1) Efavirenz (4S)-6-chloro-4-(cyclopropylethynyl)-1,4-dihydro-4-(trifluoromethyl)-2H-3,1-benzoxazin-2-one; 2) Capravirine: 1H-Imidazole-2-methanol, 5-((3,5-dichlorophenyl)thio)-4-(1-methylethyl)-1-(4-pyridinylmethyl)-carbamate(ester); 3) Etravirine (TMC 125): 4-((6-amino-5-bromo-2-((4-cyanophenyl)amino)-4-pyrimidinyl)oxy)-3,5-dimethyl-benzonitrile; and 4) Rilpivirine (TMC-278): 4-([4-[(4-[(1E)-2-cyanoethenyl]-2,6-dimethylphenyl)amino]-2-pyrimidinyl)amino]benzonitrile. Rilpivirine and Etravirine belong to a subclass of NNRTIs called diarylpyrmidines (“DAPY”). For a review of these DAPY NNRTIs see Ludovici, D. W., et al., 2002, Bioorg. Med. Chem. Lett. 11, 2235-9. An extensive patent literature also exists for DAPY. U.S. Pat. No. 6,197,779; WO 00/27850; WO 2003/016306; and WO 2004/069812, all assigned to Janssen Pharmaceuticals.
Diaryl compounds similar to Etravirine and Rilpivirine where the pyrimidine moiety is replaced by a purine are described in WO 2005/028479, which also is assigned to Janssen.
The invention provides a compound of formula I
where the dashed line represents a double bond that may be located either between A and B or between B and D,
wherein each Rp is selected from among methyl, ethyl, propyl, isopropyl, cyclopropylmethyl, or C3-C6 cycloalkyl, cyano, CH═CHCN, Cl, Br, I, acetyl and alkylamino; R4, R5, and each R6 are independently selected from among H, F, Cl, Br, CH3, CF3, CH2F, CHF2, isopropyl, cyclopropyl, OCH3, OH, OCF3, NH2 and NHCH3, or R6 and Rp on adjacent ring atoms, together with the ring atoms to which they are attached, form an additional fused five-membered ring; Q and Q′ are independently selected from N and CH; R7 is Cl, Br, I, CH3, CF3, OCH3, isopropyl, cyclopropyl, t-butyl, or cyclobutyl; and R9-R11 are, independently, H or CH3.
Compounds of formula I have inhibitory activity against both wild-type and mutated forms of human immunodeficiency virus type 1 (HIV-1).
In one embodiment this invention provides a compound of formula IA, in which the 6-linker T of formula I is T′, which may be O or S.
When T of formula I or T′ of formula IA is O, the invention excludes 1) compounds where both Rp and V are CH═CHCN or cyano unless at least one of A or D is neither —N═ nor —NH— and 2) compounds where a) R is CH═CHCN, cyano, or methyl; b) V is cyano or CH═CHCN; and c) A and D are both one of —N═; N-benzyl or N-(substituted benzyl).
In one subgeneric embodiment, the invention provides a compound of formula IA where Ar is selected from 4-cyclopropyl phenyl; 4-cyclopropylmethyl phenyl; 4-bromophenyl; 4-cyclopropyl-naphth-1-yl; 2,6-dimethyl-4-cyanophenyl; 2,6-dimethoxy-4-cyanophenyl; 2,6-dimethyl-4-(2-cyanoethenyl)phenyl; 2,6-dimethoxy-4-(2-cyanoethenyl)phenyl; 2-methyl-4-cyclopropyl phenyl; 2,6-dimethyl-4-cyclopropyl phenyl; 2,6-di-trifluoromethyl-4-cyclopropyl phenyl; 2,4,6-trimethyl phenyl; and 2,6-dimethyl-4-acetyl phenyl.
In another subgeneric embodiment, the invention contemplates a compound of formula IA where Ar is selected from the following: 5-cyclopropyl-8-quinolyl; 5-isopropyl-8-quinolyl; 5-cyano-8-quinolyl; 5-cyclopropyl-7-trifluoromethyl-8-quinolyl; 5-acetyl-8-quinolyl; 5-cyano-7-methoxy-8-quinolyl; 5-cyano-7-methyl-8-quinolyl; 5-cyclopropyl-7-trifluoromethoxy-8-isoquinolyl; 5-cyano-8-isoquinolyl; 5-cyano-7-methoxy-8-isoquinolyl; 5-cyano-7-methyl-8-isoquinolyl; 5-cyclobutyl-7-difluoromethyl-8-isoquinolyl; 5,7-dimethyl-8-cinnolyl; 5-cyclopropyl-7-methyl-8-cinnolyl; and 5-(2-cyanoethenyl)-7-methyl-8-cinnolyl.
In another subgeneric embodiment, the invention provides a compound of formula IA-1
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, the invention provides a compound of formula IA-2
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, the invention provides a compound of formula IA-3
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-4
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-5
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-6
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-7
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-8
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-9
where Ar, V, W, and Z are defined as for formula I.
In another subgeneric embodiment, this invention provides a compound of formula IA-10
where Ar, V, W, and Z are defined as for formula I.
In another embodiment, this invention provides a compound of formula IB
where all substituents are as described above, except that when Ar is (c), this invention excludes compounds in which V is either cyano or CH═CHCN, unless A or D is CZ or CW.
In one subgeneric embodiment, the invention provides a compound of formula IB where Ar is (c), subject to the exclusion in the immediately preceding paragraph.
In a more specific subgeneric embodiment, the invention provides a compound of formula IB where Ar is
where Rp is CN, CH═CHCN, or cyclopropyl; where R6 and R7 are either both methyl or both methoxy; and subject to the exclusion described above for formula IB.
In another subgeneric embodiment, this invention provides a compound of formula IB-1
In another subgeneric embodiment, this invention provides a compound of formula IB-2.
where Ar, V, W, and Z are as described above for formula IB.
In another subgeneric embodiment, the invention provides a compound of formula IB-3.
where Ar, W, and Z are as described above for formula IB.
In another subgeneric embodiment, the invention provides a compound of formula IB-4.
where Ar, V, and Z are as described above for formula IB.
In more specific embodiments, the invention provides compounds of any of IA-1, IA-2, IA-3, IA-4, IA-5, IA-6, IA-7, IA-8, IA-9, IA-10, IB-1, IB-2, IB-3, and IB-4, where Ar is (a).
In additional more specific embodiments, the invention provides compounds of any of IA-1, IA-2, IA-3, IA-4, IA-5, IA-6, IA-7, IA-8, IA-9, IA-10, IB-1, IB-2, IB-3, and IB-4, where Ar is (b).
In additional more specific embodiments, the invention provides compounds of any of IA-1, IA-2, IA-3, IA-4, IA-5, IA-6, IA-7, IA-8, IA-9, IA-10, IB-1, IB-2, IB-3, and IB-4, where Ar is (c).
In additional more specific embodiments, the invention provides compounds of any of IA-1, IA-2, IA-3, IA-4, IA-5, IA-6, IA-7, IA-8, IA-9, IA-10, IB-1, IB-2, IB-3, and IB-4, where Ar is (d).
In a more specific subgeneric embodiment, this invention provides or contemplates a compound of formula IA-7, IA-8, IA-9, or IA-10, where Ar is 4-cyclopropyl-, 4-acetyl-, 4-methyl-, 4-bromo-, or 4-cyano-2,6-di-substituted phenyl.
In another more specific subgeneric embodiment, this invention provides or contemplates a compound of formula IA-1, IA-2, IA-3, or IA-4, where Ar is 4-cyclopropyl-, 4-acetyl-, 4-methyl-, 4-bromo-, or 4-cyano-2,6-di-substituted phenyl.
In another more specific subgeneric embodiment, this invention provides or contemplates a compound of formula IA-5 or IA-6, where Ar is 4-cyclopropyl-, 4-acetyl-, 4-methyl-, 4-bromo- or 4-cyano-2,6-di-substituted phenyl.
Synthetic Procedures
Compounds of this invention which are of the 7-deaza-8-azapurine type can be prepared according to Scheme 1.
Compound (1), 2-mercapto-6-hydroxy-7-deaza-8-aza-purine, can be synthesized by published procedures known to those skilled in the art. Youssif, S., et al., 2003, Bull. Kor. Chem. Soc., 24, 1429-32; Bontems, R. J., et al., 1990, J. Med. Chem. 33, 2174-8; Badger, G. M., & Rao, R. P., 1965, Aust. J. Chem. 18, 1267-71.
Alternatively, the 7-deaza-8-azapurines can be synthesized according to Scheme 2, where “PMBCl” is p-methoxy benzyl chloride. The starting material is prepared by published procedures known to those skilled in the art. Seela, F., 1999, Helv. Chim. Act. 82, 105-124; Taylor, E., 1992, Tetrahedron 48, 8089-100; Seela, F., 1986, Helv. Chim. Act. 69, 1602-1613.
The 8-aza-9-deazapurines of this invention can be synthesized according to Scheme 3. The synthesis of the starting material was described by Lewis, A. F., & Townsend, L. B., 1982, J. Am. Chem. Soc. 104, 1073-78.
The 9-deazapurines of this invention can be synthesized by Scheme 4. The synthesis of the starting material is described by Kielich, Klaus, ed., “Synthetic Communications” 2002 vol. 32, pp-3797-3802.
The 7-deazapurines of this invention are prepared by the procedure of Scheme 5. The starting material can be synthesized by the condensation of 2,6-diamino-1,2-dihydro[3H]pyrimidin-4-one with chloroacetaldehyde followed by treatment with phosphorus oxychloride, as indicated in Examples 1 and 3.
The purine compounds of this invention can be synthesized by strategies similar to those provided above, using N7-benzyl-2,6-dichloropurine as the starting material. This procedure is illustrated in WO 2005/028479.
Step A1:
2-Amino-3,7-dihydro-pyrrolo[2,3-d]pyrimidin-4-one. To a mixture of 2,4-diamino-6-hydroxypyrimidine (20.0 g, 159 mmol) and NaOAc (26.0 g, 317 mmol) in H2O (300 mL) at 65° C. was added a solution of chloroacetaldehyde (22.0 mL, 50% in H2O, 173 mmol) in H2O (22 mL) dropwise for 90 min. The mixture was stirred at 65° C. for an additional 2 h and cooled to room temperature. The reaction mixture was concentrated in vacuo to one third of its original volume and stored at 4° C. for 16 h. The light pink precipitates were filtered, washed with an ice cold H2O (5 mL), and dried under high vacuum for 16 h. The precipitates were placed in Soxhlet extractor and refluxed with methanol (200 mL) for 24 h. The methanol was concentrated to give 13.3 g (56%) of 2-amino-3,7-dihydro-pyrrolo[2,3-d]pyrimidin-4-one as a light pink solid.
Step A2:
4-Chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine. To a solution of 2-amino-3,7-dihydro-pyrrolo[2,3-d]pyrimidin-4-one (5.00 g, 33.3 mmol), dimethylaniline (4.22 mL, 41.0 mmol) and benzyltriethylammonium chloride (15.2 g, 66.6 mmol) in acetonitrile (25 mL) at room temperature under argon was added POCl3 (18.6 mL, 200 mmol) dropwise for 30 min. The mixture was refluxed at 85° C. for 3 h and cooled to room temperature. The reaction was concentrated in vacuo to brown oil and to the oil was added an ice cold H2O (10 mL). The pH of the solution was adjusted to 5 by the addition of an aqueous NH4OH solution. Silica gel chromatography (CH2Cl2:MeOH=95:5) yielded 2.53 g (45%) of 4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine as a light yellow solid. The product was then benzylated at N7 using standard techniques.
Step C:
7-benzyl-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine. To a solution of 2,4,6-trimethylphenol (161 mg, 1.16 mmol) in 1-methyl-2-pyridone (2 mL) in a sealed tube was added NaH (46 mg, 1.16 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 7-benzyl-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (100 mg, 0.39 mmol) in 1-methyl-2-pyridone (1 mL) was added to the mixture. The mixture was heated at 150° C. for 16 h and cooled to room temperature. The reaction mixture was poured into ice water and extracted with EtOAc (2×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 107 mg (77%) of 7-benzyl-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine.
Step D:
7-benzyl-2-fluoro 4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidine. To 7-benzyl-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (105 mg, 0.29 mmol) in a polyethylene flask at −50° C. under argon was added 60% HF in pyridine (12 mL). To the resulting solution tert-butylnitrite (0.052 mL, 0.44 mmol) was added dropwise for 5 min. The reaction was warmed to −40° C. and stirred for 30 min at the temperature. The reaction mixture was diluted with CHCl3 (100 mL) and poured into K2CO3 (3 g) in a beaker. Ice water (50 mL) was carefully added to the mixture. The CHCl3 layer was separated, washed with aqueous NaHCO3 solution (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 72 mg (68%) of 7-benzyl-2-fluoro-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidine as a light yellow solid.
Step E:
4-[7-benzyl-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile. To a solution of 4-aminobenzonitrile (101 mg, 0.86 mmol) in 1-methyl-2-pyridone (1 mL) was added NaH (34 mg, 0.86 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 7-benzyl-2-fluoro-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidine (62 mg, 0.17 mmol) in 1-methyl-2-pyridone (1 mL) was added to the mixture. The mixture was stirred at room temperature for 1 h, poured into ice water, and extracted with EtOAc (2×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 64 mg (82%) of 4-[7-benzyl-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile.
Step F:
4-[4-(2,4,6-Trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile. To a solution of 4-[7-benzyl-4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile (38 mg, 0.083 mmol) in 1,2-dichlorobenzene (1 mL) was added aluminum chloride (55 mg, 0.42 mmol). The reaction mixture was stirred at 160° C. for 4 h and cooled to room temperature. The mixture was poured into ice water and extracted with CH2Cl2 (2×10 mL). The combined organic solution was washed with brine (10 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc 50:50) yielded 15 mg (49%) of 4-[4-(2,4,6-trimethyl-phenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile as a tan solid.
Step A;
7-benzyl-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine. To a solution of 2,4,6-trimethylbenzene-1-thiol (231 mg, 1.52 mmol) in 1-methyl-2-pyridone (2 mL) was added NaH (58 mg, 1.52 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 7-benzyl-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (131 mg, 0.51 mmol) in 1-methyl-2-pyridone (2 mL) was added to the mixture. The mixture was heated at 60° C. for 16 h and cooled to room temperature. The reaction was poured into ice water and extracted with EtOAc (2×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 180 mg (94%) of 7-benzyl-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine.
Step B:
7-benzyl-2-fluoro-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidine. To 7-benzyl-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (155 mg, 0.41 mmol) in a polyethylene flask at −50° C. under argon was added 60% HF in pyridine (12 mL). To the solution was added tert-butylnitrite (0.074 mL, 0.62 mmol) dropwise for 5 min. The reaction was warmed to −40° C. and stirred for 30 min at the temperature. The reaction was diluted with CHCl3 (100 mL) and poured into K2CO3 (3 g) in a beaker. To the mixture was carefully added ice water (50 mL). The CHCl3 layer was separated, washed with aqueous NaHCO3 solution (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 118 mg (77%) of 7-benzyl-2-fluoro-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidine as a yellow solid.
Step C:
4-[7-benzyl-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile. To a solution of 4-aminobenzonitrile (184 mg, 1.56 mmol) in 1-methyl-2-pyridone (2 mL) was added NaH (62 mg, 1.56 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 7-benzyl-2-fluoro-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidine (118 mg, 0.31 mmol) in 1-methyl-2-pyridone (2 mL) was added to the mixture. The mixture was stirred at room temperature for 4 h, then poured into ice water and extracted with EtOAc (2×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 123 mg (83%) of 4-[7-benzyl-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile.
Step D:
4-[4-(2,4,6-Trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile. To a solution of 4-[7-benzyl-4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile (103 mg, 0.21 mmol) in 1,2-dichlorobenzene (2 mL) was added aluminum chloride (87 mg, 0.65 mmol). The reaction mixture was stirred at 160° C. for 1.5 h and cooled to room temperature. The mixture was poured into ice water and extracted with CH2Cl2 (2×10 mL). The combined organic solution was washed with brine (10 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=50:50) yielded 28 mg (34%) of 4-[4-(2,4,6-trimethyl-phenylsulfanyl)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile as a tan solid.
Steps A and B as in Example 1.
Step C:
4-(2-Amino-7-benzyl-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile. To a solution of 4-hydroxy-3,5-dimethylbenzonitrile (1.62 mg, 11.0 mmol) in 1-methyl-2-pyridone (5 mL) in a sealed tube was added NaH (441 mg, 11.0 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 7-benzyl-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (950 mg, 3.67 mmol) in 1-methyl-2-pyridone (5 mL) was added to the mixture. The mixture was heated at 150° C. for 16 h and cooled to room temperature. The reaction was poured into ice water and extracted with EtOAc (2×50 mL). The combined organic solution was washed with H2O (50 mL) and brine (50 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc 75:25) yielded 1.12 mg (83%) of 4-(2-amino-7-benzyl-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile.
Step D:
4-(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile. To 4-(2-amino-7-benzyl-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile (70 mg, 0.19 mmol) in a polyethylene flask at −50° C. under argon was added 60% HF in pyridine (12 mL). To the solution was added tert-butylnitrite (0.068 mL, 0.57 mmol) dropwise for 5 min. The reaction was warmed to −40° C. and stirred for 30 min at the temperature. The reaction was diluted with CHCl3 (100 mL) and poured into K2CO3 (3 g) in a beaker. To the mixture was carefully added ice water (50 mL). The CHCl3 layer was separated, washed with aqueous NaHCO3 solution (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 36 mg (51%) of 4-(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile.
Step E:
4-[7-benzyl-2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile. To a solution of 4-aminobenzonitrile (54 mg, 0.46 mmol) in 1-methyl-2-pyridone (1 mL) was added NaH (18 mg, 0.46 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 4-(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile (34 mg, 0.091 mmol) in 1-methyl-2-pyridone (1 mL) was added to the mixture. The mixture was stirred at room temperature for 1 h, poured into ice water, and extracted with EtOAc (2×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 28 mg (65%) of 4-[7-benzyl-2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile.
Step F:
4-[2-(4-Cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile. To a solution of 4-[7-benzyl-2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile (28 mg, 0.060 mmol) in 1,2-dichlorobenzene (1 mL) was added aluminum chloride (40 mg, 0.30 mmol). The reaction mixture was stirred at 160° C. for 45 min and cooled to room temperature. The mixture was poured into ice water and extracted with CH2Cl2 (2×10 mL). The combined organic solution was washed with brine (10 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=50:50) yielded 6 mg (27%) of 4-[2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile as a tan solid.
Step A:
7-benzyl-N4-(2,4,6-trimethyl-phenyl)7H-pyrrolo[2,3-d]pyrimidine-2,4-diamine. To a suspension of 7-benzyl-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (200 mg, 0.78 mmol) and 2,4,6-trimethylaniline (0.44 mL, 3.08 mmol) in 2,2,2-trifluoroethanol (4 mL) was added trifluoroacetic acid (0.48 mL, 6.24 mmol). The resulting solution was heated at 100° C. for 2 days and cooled to room temperature. The reaction was concentrated to brown oil and diluted with CH2Cl2 (30 mL). The organic solution was washed with aqueous NaHCO3 solution (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (CH2Cl2:MeOH=95:5) yielded 251 mg (90%) of 7-benzyl-N4-(2,4,6-trimethyl-phenyl)-7H-pyrrolo[2,3-d]pyrimidine-2,4-diamine.
Step B:
(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-(2,4,6-trimethyl-phenyl)-amine. To 7-benzyl-N4-(2,4,6-trimethyl-phenyl)-7H-pyrrolo[2,3-d]pyrimidine-2,4-diamine (251 mg, 0.70 mmol) in a polyethylene flask at −50° C. under argon was added 60% HF in pyridine (24 mL). To the solution was added tert-butylnitrite (0.42 mL, 3.5 mmol) dropwise for 10 min. The reaction was warmed to −40° C. and stirred for 30 min at the temperature. The reaction was diluted with CHCl3 (200 mL) and poured into K2CO3 (6 g) in a beaker. To the mixture was carefully added ice water (100 mL). The CHCl3 layer was separated, washed with aqueous NaHCO3 solution (40 mL) and brine (40 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 56 mg (22%) of (7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-(2,4,6-trimethyl-phenyl)-amine.
Step C:
4-[7-benzyl-4-(2,4,6-trimethyl-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile. To a suspension of (7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-(2,4,6-trimethyl-phenyl)-amine (42 mg, 0.12 mmol) and 4-aminobenzonitrile (55 mg, 0.47 mmol) in 2,2,2-trifluoroethanol (4 mL) was added trifluoroacetic acid (0.072 mL, 0.94 mmol). The resulting solution was heated at 90° C. for 16 h, then cooled to room temperature. The reaction was concentrated to produce a brown oil and diluted with CH2Cl2 (30 mL). The organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 34 mg (64%) of 4-[7-benzyl-4-(2,4,6-trimethyl-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile.
Step D:
4-[4-(2,4,6-Trimethyl-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile. To a solution of 4-[7-benzyl-4-(2,4,6-trimethyl-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile (34 mg, 0.074 mmol) in 1,2-dichlorobenzene (1 mL) was added aluminum chloride (50 mg, 0.37 mmol). The reaction mixture was stirred at 160° C. for 2 h and cooled to room temperature. The mixture was poured into ice water and extracted with CHCl3 (2×10 mL). The combined organic solution was washed with brine (10 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (CH2Cl2:Acetone=90:10) yielded 5 mg (19%) of 4-[4-(2,4,6-trimethyl-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino]-benzonitrile as a tan solid.
Step A:
4-(2-Amino-7-benzyl-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile. To a solution of 4-hydroxy-3,5-dimethylbenzonitrile (1.62 mg, 11.0 mmol) in 1-methyl-2-pyridone (5 mL) in a sealed tube was added NaH (441 mg, 11.0 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 7-benzyl-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (950 mg, 3.67 mmol) in 1-methyl-2-pyridone (5 mL) was added to the mixture. The mixture was heated at 150° C. for 16 h and cooled to room temperature. The reaction was poured into ice water and extracted with EtOAc (2×50 mL). The combined organic solution was washed with H2O (50 mL) and brine (50 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 1.12 mg (83%) of 4-(2-amino-7-benzyl-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile.
Step B:
4-(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile. To 4(2-amino-7-benzyl-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile (70 mg, 0.19 mmol) in a polyethylene flask at −50° C. under argon was added 60% HF in pyridine (12 mL). To the solution was added tert-butylnitrite (0.068 mL, 0.57 mmol) dropwise for 5 min. The reaction was warmed to −40° C. and stirred for 30 min at the temperature. The reaction was then diluted with CHCl3 (100 mL) and poured into K2CO3 (3 g) in a beaker. Ice water (50 mL) was carefully added. The CHCl3 layer was separated, washed with aqueous NaHCO3 solution (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 36 mg (51%) of 4-(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile.
Step C:
4-[7-benzyl-2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile. To a solution of 4-aminobenzonitrile (54 mg, 0.46 mmol) in 1-methyl-2-pyridone (1 mL) was added NaH (18 mg, 0.46 mmol). The reaction mixture was stirred at room temperature for 15 min and a solution of 4-(7-benzyl-2-fluoro-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy)-3,5-dimethyl-benzonitrile (34 mg, 0.091 mmol) in 1-methyl-2-pyridone (1 mL) was added to the mixture. The mixture was stirred at room temperature for 1 h, poured into ice water and extracted with EtOAc (2×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 28 mg (65%) of 4-[7-benzyl-2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile.
Step D:
4-[2-(4-Cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile. To a solution of 4-[7-benzyl-2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile (28 mg, 0.060 mmol) in 1,2-dichlorobenzene (1 mL) was added aluminum chloride (40 mg, 0.30 mmol). The reaction mixture was stirred at 160° C. for 45 min and cooled to room temperature. The mixture was poured into ice water and extracted with CH2Cl2 (2×10 mL). The combined organic solution was washed with brine (10 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=50:50) yielded 6 mg (27%) of 4-[2-(4-cyano-phenylamino)-7H-pyrrolo[2,3-d]pyrimidin-4-yloxy]-3,5-dimethyl-benzonitrile as a tan solid.
4-Cyclopropyl-2,6-dimethylphenol. To a suspension of (4-bromo-2,6-dimethylphenoxy)tert-butyldimethylsilane (668 mg, 2.12 mmol) and tetrakis(triphenylphosphine)palladium (122 mg, 0.11 mmol) in THF (20 mL) was added cyclopropyl zinc chloride (28.0 mL, 11.2 mmol). The mixture was heated at 80° C. for 24 h and cooled to room temperature. The reaction was passed through a short pad of SiO2 to remove the catalyst and the solution was concentrated to oil. The resulting oil was diluted in EtOAc (100 mL), washed with brine (100 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=90:10) yielded 370 mg (63%) of tert-butyl(4-cyclopropyl-2,6-dimethylphenoxy)dimethylsilane. To tert-butyl(4-cyclopropyl-2,6-dimethylphenoxy)dimethylsilane (320 mg, 1.16 mmol) in THF (10 mL) was added a solution of tetrabutylammonium fluoride (5.0 mL, 1 M in THF, 5.0 mmol) and acetic acid (0.40 mL). The reaction was stirred at room temperature for 3 h and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=85:15) yielded 175 mg (93%) of 4-cyclopropyl-2,6-dimethylphenol as a light yellow oil.
2-chloro-6-(4-cyclopropyl-2,6-dimethylphenoxy)-9H-purine. To a solution of 4-cyclopropyl-2,6-dimethylphenol (263 mg, 1.62 mmol) in 1-methyl-2-pyridone (3 mL) at 0° C. was added NaH (65 mg, 1.62 mmol). The reaction mixture was stirred at room temperature for 30 min and a solution of 2,6-dichloropurine (102 mg, 0.54 mmol) in 1-methyl-2-pyridone (2 mL) was added to the mixture. The mixture was heated at 100° C. for 16 h and then cooled to room temperature. The reaction was poured into ice water and extracted with CHCl3 (3×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (MeOH:CHCl3=5:95) yielded 114 mg (67%) of 2-chloro-6-(4-cyclopropyl-2,6-dimethylphenoxy)-9H-purine.
4-(6-(4-cyclopropyl-2,6-dimethylphenoxy)-9H-purin-2-ylamino)benzonitrile. To a suspension of 2-chloro-6-(4-cyclopropyl-2,6-dimethylphenoxy)-9H-purine (28 mg, 0.088 mmol) and 4-aminobenzonitrile (42 mg, 0.35 mmol) in 2,2,2-trifluoroethanol (3 mL) in a sealed tube was added trifluoroacetic acid (0.056 mL, 0.70 mmol). The resulting solution was heated at 90° C. for 3 days. The reaction was cooled to room temperature and concentrated to dryness. Silica gel chromatography (CH2Cl2:Acetone=80:20) yielded 7 mg (20%) of 4-(6-(4-cyclopropyl-2,6-dimethylphenoxy)-9H-purin-2-ylamino)benzonitrile as a light yellow solid.
2,4-dichloro-7H-pyrrolo[2,3-d]pyrimidine. To a suspension of 4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-ylamine (500 mg, 2.97 mmol) in 1,2-dichloroethane (40 mL) at −10° C. under argon was added antimony chloride (750 mg, 3.29 mmol). After stirring for 5 min, tert-butylnitrite (2.50 mL, 20.8 mmol) was added to the solution. The reaction was stirred at −10° C. for 3 h. The reaction was diluted with CHCl3 (100 mL) and poured into ice water (50 mL). The CHCl3 layer was separated, washed with brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=50:50) yielded 239 mg (43%) of 2,4-dichloro-7H-pyrrolo[2,3-d]pyrimidine as a tan solid.
2-chloro-4-(4-cyclopropyl-2,6-dimethylphenoxy)-7H-pyrrolo[2,3-d]pyrimidine. To a solution of 4-cyclopropyl-2,6-dimethylphenol (259 mg, 1.60 mmol) in THF (3 mL) at 0° C. was added NaH (64 mg, 1.60 mmol). The reaction mixture was stirred at room temperature for 30 min and a solution of 2,4-dichloro-7H-pyrrolo[2,3-d]pyrimidine (100 mg, 0.53 mmol) in THF (2 mL) was added to the mixture. The mixture was heated at 80° C. for 16 h and cooled to room temperature. The reaction was poured into ice water and extracted with CHCl3 (3×20 mL). The combined organic solution was washed with H2O (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (Hexanes:EtOAc=75:25) yielded 79 mg (48%) of 2-chloro-4-(4-cyclopropyl-2,6-dimethylphenoxy)-7H-pyrrolo[2,3-d]pyrimidine as a tan solid.
4-(4-(4-cyclopropyl-2,6-dimethylphenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino)benzonitrile. To a suspension of 2-chloro-4-(4-cyclopropyl-2,6-dimethylphenoxy)-7H-pyrrolo[2,3-d]pyrimidine (75 mg, 0.24 mmol) and 4-aminobenzonitrile (113 mg, 0.96 mmol) in 2,2,2-trifluoroethanol (4 mL) in a sealed tube was added trifluoroacetic acid (0.15 mL, 1.92 mmol). The resulting solution was heated at 90° C. for 3 days. The reaction was diluted with EtOAc (50 mL), washed with NaHCO3 (20 mL) and brine (20 mL), dried with Na2SO4, and concentrated to dryness. Silica gel chromatography (CH2Cl2:Acetone 90:10) yielded 15 mg (16%) of 4-(4-(4-cyclopropyl-2,6-dimethylphenoxy)-7H-pyrrolo[2,3-d]pyrimidin-2-ylamino)benzonitrile as a tan solid.
Scheme 1 illustrate the synthesis of 9-deazaguanine by starting with commercially available 2-amino-6-methylpyrimidin-4(3H)-one and nitrated with nitric acid followed by treatment of the nitrated product with N,N-dimethylformamide dimethyl acetal (DMF-DMA) to afford the corresponding 2-(dimethylamino)methyleneimino derivative. It was then benzylated to produce 3-benzyl-2-[(dimethylamino)methyleneimino]-5-nitro-6-methylpyrimidin-4-one by treating with benzyl bromide and converted to benzylated-2,6-bis-dimethylaminomethylene derivative with DMF-DMA. Reductive cyclization with sodium hydrosulfite followed by de-protection with 3M NaOH and de-benzylation with Pd/C and NH4CO2H afforded 9-deazaguanine.
Scheme 2 illustrates the 3 different pathways which provide the various substituted 9-deazapurines. Other products are synthesized by analogous methods, which a person skilled in the art could formulate, based on the reaction sequences given above. In certain cases, the person skilled in the art would see that protecting groups might be necessary. The synthetic scheme can be summarized as follows.
Benzylation of 9-deazaguanine followed by chlorination with POCl3 gives the chlorinated 9-deazapurine product. This chlorinated intermediate can either be coupled with R2 (pathway 1) followed by diazotization with t-butyl nitrite; displaced with F; coupled with R3 and de-benzylated to give the product; or it can undergo pathway 2, which is diazotization with t-butyl nitrite in the presence of antimony chloride followed by coupling with R2 and R3, followed by de-benzylation to afford the final product. Alternatively, pathway 3 provides for de-benzylation of the dichloro-9-deazapurine followed by the coupling with R2 and R3 respectively to provide the various substituted 9-deazapurine.
To a mixture of 2-amino-6-methylpyrimidin-4(3H)-one (50 g, 0.4 mol) in 250 mL of H2SO4 at 0° C. was added 40 mL of HNO3 with an additional funnel. After being stirred at room temperature for 3 h, the reaction mixture was slowly poured into 3.6 L of diethyl ether and stirred for 15 min. Decant the ether solution and added 1.0 L of ethyl acetate to the solid and stirred for 10 h. The solid (54.8 g, 81% yield) was filtered and used for next step without any further purification.
To a suspension of 2-Amino-6-methyl-5-nitropyrimidin-4(3H)-one (54.8 g, 0.32 mol) in CH2Cl2 (461 mL) was added DMF-dimethylacetal (103.1 mL, 0.77 mol) and stirred at room temperature for 1.5 h. The reaction mixture was filtered, washed with CH2Cl2, and used for the next step without further purification (31.9 g, 44% yield).
To a suspension of (E)-N,N-Dimethyl-N′-(4-methyl-5-nitro-6-oxo-1,6-dihydropyrimidin-2-yl)formimidamide (53.4 g, 0.24 mmol) in DMF (690 mL) was added DBU (44.6 mL, 0.30 mol) and benzyl bromide (44.4 mL, 0.29 mol) and stirred at room temperature for 1 h. The excess of DBU was neutralized with HCl, and the mixture was concentrated in vacuo. The residue was dissolved in methylene chloride and extracted twice with 2M HCl and water, then dried over Na2SO4 and concentrated. Trituration with ethanol afforded the crystalline product which was washed with ethanol to give the product (64.7 g, 86% yield) and used in the next step without further purification.
To a solution of (E)-N′(1-benzyl-4-methyl-5-nitro-6-oxo-1,6-dihydropyrimidin-2-yl)-N,N-dimethylformimidamide (64.7 g, 0.2 mol) in DMF (254 mL) was added DMF-dimethylacetal (54.5 mL, 0.41 mol). The reaction mixture was stirred for 3 h at 65° C., cooled, and the solvent was removed under reduced pressure. The residue was triturated with ethanol, and the solid was collected by vacuum filtration (69.2 g, 91%) and used in the next step without further purification.
To a mixture of (E)-N′-(1-benzyl-4-((E)-2-(dimethylamino)vinyl)-5-nitro-6-oxo-1,6-dihydropyrimidin-2-yl)-N,N-dimethylfommimidamide (43.0 g, 0.12 mol) in THF (151 mL) was added an aqueous saturated solution of Na2S2O4 and stirred at room temperature overnight. Upon completion of the reaction, the solid was filtered and washed with THF to afford the product (21.2 g, 62% yield) which was used in the next step without further purification.
To a mixture of (E)-N′-(3-benzyl-4-oxo-4,5-dihydro-3H-pyrrolo[3,2-d]pyrimidin-2-yl)-N,N-dimethylformimidamide (21.2 g, 0.07 mol) in MeOH (382 mL) was added 3M NaOH (276 mL) and heated at 100° C. for 5 h. After completion of the reaction, the reaction mixture was cooled to 0° C. The solid was filtered (15.8 g, 91%) and used in the next step without further purification.
To a mixture of 2-amino-3-benzyl-3H-pyrrolo[3,2-d]pyrimidin-4(5H)-one (10 g, 0.04 mol) in MeOH (334 mL) was added 10% Pd/C (2 g), ammonium formate (13.2 g, 0.21 mmol) and heated at 75° C. for 4 h. After completion of the reaction, the reaction mixture was cooled and filtered through a pad of Celite with hot 1:1 DMF/MeOH. The filtrate was concentrated in vacuo to provide the product as an off-white solid (6.2 g, 99%).
To a suspension of 2-amino-3H-pyrrolo[3,2-d]pyrimidin-4(5H)-one (336.7 mg, 2.0 mmol) in CH2Cl2 (14.3 mL) was added benzyl bromide (0.26 mL, 2.2 mmol) and TBABr (644 mg, 2.0 mmol). The reaction mixture was cooled to 0° C., and to it was added 50% NaOH (1.7 mL). The resulting mixture was stirred for 2 h as it warmed from 0° C. to room temperature. Water was then added, and the solution was washed with CHCl3. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. Purification by column chromatography, eluting with CH2Cl2/Acetone (5:1-1:1), afforded the product as a tan solid (423 mg, 82%)
A mixture of 2-amino-5-benzyl-3H-pyrrolo[3,2-d]pyrimidin-4(5H)-one (1.1 g, 7.4 mmol) and POCl3 (7 mL, 74 mmol) was heated at 116° C. for 3 h. Upon completion of the reaction, the reaction mixture was poured into ice and extracted three times with ethyl acetate. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. Purification by column chromatography, eluting with CH2Cl2/Acetone (3:1), afforded the product as a white solid (490 mg, 40%).
To a stirred suspension of NaH (56 mg, 2.33 mmol) in dry NMP (2 mL) was added 2,4,6-trimethyl phenol (317 mg, 2.33 mmol). The mixture was stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine (200 mg, 0.78 mmol) in dry NMP (1.5 mL) and the resulting solution was heated at 90° C. for 16 h. After completion of the reaction, the reaction mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with water, 2% NaOH, and brine and dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (3:1) to give the product as a white solid (140 mg, 50%).
A solution of 5-benzyl-4-(mesityloxy)-5H-pyrrolo[3,2-d]pyrimidin-2-amine (139.9 mg, 0.39 mmol) in pyridine (1.6 mL) was cooled to −50° C. and HF-pyr (8 mL) and t-butyl nitrite (0.19 mL, 1.56 mmol) was added dropwise. The reaction mixture was stirred at 50° C. to −30° C. for 1.5 h. Upon completion of the reaction, the reaction mixture was poured into K2CO3 (5 g), slowly added water and washed with CHCl3×3. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes/ethyl acetate (2:1) to give the product as a white solid (116 mg, 82%).
A stirred suspension of NaH (63.8 mg, 2.66 mmol) in dry NMP (1.5 mL) was added 4-aminobenzylnitrile (188 mg, 2.66 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-2-fluoro-4-(mesityloxy)-5H-pyrrolo[3,2-d]pyrimidine (115 mg, 0.32 mmol) in dry NMP (1.7 mL) and stirred at room temperature for 2 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc 3 times. The combined organic layers were washed with water, NH4Cl, water×2, and brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with 1% MeOH:CH2Cl2, which afforded the product as a tan solid (120 mg, 80%).
To a suspension of 4-(5-benzyl-4-(mesityloxy)-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (150 mg, 0.33 mmol) in 1,2-dichlorobenzene (13 mL) was added AlCl3 (436 mg, 3.27 mmol). The reaction mixture was heated at 160° C. for 1.5 h during which the reaction mixture became dark and homogeneous. Upon completion of the reaction, the reaction mixture was cooled and washed with NH4Cl. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with Hexanes:Ethyl acetate (5:1-1:1) provided the product as a tan solid (27.8 mg, 23%).
To a stirred suspension of NaH (155 mg, 6.47 mmol) in dry NMP (4 mL) was added 4-hydroxy-3,5-dimethylbenzonitrile (570 mg, 3.88 mmol), and the mixture was stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine (400 mg, 1.55 mmol) in dry NMP (4 mL) and heated at 160° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with water, 2% NaOH, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (2:1-1:4) to give the product as a light yellow solid (342 mg, 60%).
A solution of 4-(2-amino-5-benzyl-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (319.4 mg, 0.87 mmol) in pyridine (3 mL) was cooled to −50° C. and HF-pyr (15 mL) and t-butyl nitrite (0.42 mL, 3.46 mmol) were added dropwise. The reaction mixture was stirred at −50° C. to −20° C. for 1.5 h. Upon completion of the reaction, the mixture was poured into K2CO3 (8 g), diluted with water and washed with CHCl3×3. The combined organic layers were washed with brine, dried. (Na2SO4), filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes/ethyl acetate (2:1-1:1) which same the product as a light yellow solid (314 mg, 97%).
4-(5-benzyl-2-(4-cyanophenylamino)-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile
To a stirred suspension of NaH (101 mg, 4.21 mmol) in dry NMP (4 mL) was added 4-aminobenzylnitrile (299 mg, 2.53 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 4-(5-benzyl-2-fluoro-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (314 mg, 0.84 mmol) in dry NMP (4.4 mL) and stirred at room temperature for 2 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc×3. The combined organic layers were washed with water, NH4Cl, water×2, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with 1% MeOH:CH2Cl2, producing the product as a tan solid (320 mg, 80%).
To a suspension of 4-(5-benzyl-2-(4-cyanophenylamino)-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (240 mg, 0.51 mmol) in 1,2-dichlorobenzene (20 mL) was added AlCl3 (681 mg, 5.1 mmol). The reaction mixture was heated at 160° C. for 1.5 h, during which time the reaction mixture became dark and homogeneous. Upon completion of the reaction, the reaction mixture was cooled and washed with NH4Cl. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by preparative TLC eluting with Hexanes:Ethyl acetate (2.5:1) and produced the product as a pink solid (51 mg, 26%).
To a stirred suspension of NaH (48 mg, 2 mmol) in dry NMP (2 mL) was added 2,4,6-trimethyl-benzene-1-thiol (191 mg, 1.2 mmol) The mixture was and stirred at room temperature for 30 min under argon. The reaction mixture was then added to a solution of 5-benzyl-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine (103 mg, 0.4 mmol) in dry NMP (2.5 mL) and heated at 60° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with water, 2% NaOH, and brine; dried over Na2SO4; filtered; and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (2:1-1:3) to give the product as a light yellow solid (131 mg, 88%).
A solution of 5-benzyl-4-(mesitylthio)-5H-pyrrolo[3,2-d]pyrimidin-2-amine (131 mg, 0.35 mmol) in pyridine (1.6 mL) was cooled to −50° C. and added HF-pyr (8 mL) and t-butyl nitrite (0.17 mL, 1.4 mmol) dropwise. The reaction mixture was stirred at −50° C. to −40° C. for 1.5 h. Upon completion of the reaction, the reaction was poured into K2CO3 (5 g), slowly added water and washed with CHCl3×3. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes/ethyl acetate (5:1-1:1) to give the product as an off-white solid (94 mg, 71%).
To a stirred suspension of NaH (30 mg, 1.25 mmol) in dry NMP (1.5 mL) was added 4-aminobenzylnitrile (87.4 mg, 0.74 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-2-fluoro-4-(mesitylthio)-5H-pyrrolo[3,2-d]pyrimidine (93 mg, 0.25 mmol) in dry NMP (1 mL) and stirred at room temperature for 2 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc×3. The combined organic layers were washed with water, NH4Cl, water×2, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by preparative TLC, eluting with Hexanes:Ethyl acetate (1.5:1) afforded the product as a tan solid (12.6 mg, 11%).
To a suspension of 4-(5-benzyl-4-(mesitylthio)-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (9.2 mg, 0.03 mmol) in 1,2-dichlorobenzene (1 mL) was added AlCl3 (26 mg, 0.3 mmol). The reaction mixture was heated at 160° C. for 1.5 h, which the reaction mixture became dark and homogeneous. Upon completion of the reaction, the reaction mixture was cooled and washed with NH4Cl. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by preparative TLC, eluting with Hexanes:Ethyl acetate (2.5:1) produced the product as a pink solid (7.7 mg, 20%).
To a suspension of 5-benzyl-4-chloro-5H-pyrrolo[3,2-d]pyrimidin-2-amine (641 mg, 2.5 mmol) in 1,2-dichloroethane (35 mL) was cooled to −10° C. SbCl3 (850 mg, 3.7 mmol) was added. The reaction mixture was stirred for 5 min. t-butyl nitrite (2.1 mL, 17.4 mmol) was added dropwise and the stirred mixture was from −10° C. to room temperature for 5 h. Upon completion of the reaction, the reaction mixture was poured into ice water and washed with CH2Cl2. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by silica gel column chromatography eluting with Hexanes:Ethyl acetate (9:1-1:1), and gave the product as an off-white solid (528 mg, 77%).
To a suspension of 5-benzyl-2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (177 mg, 0.64 mmol) in 1,2-dichlorobenzene (20 mL) was added AlCl3 (852 mg, 6.4 mmol). The reaction mixture was heated at 160° C. for 1.5 h, during which the reaction mixture became dark and homogeneous. Upon completion of the reaction, the reaction mixture was cooled, added CHCl3 and washed with NH4Cl. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. Added Hexanes and filtered off the product as purple solids (100 mg, 80%) and used for the next step without further purification.
To a stirred suspension of NaH (25 mg, 0.64 mmol) in dry NMP (1.5 mL) was added 4-cyclopropyl-2,6-dimethylphenol (103 mg, 0.64 mmol) and the resolution mixture was stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (120 mg, 0.64 mmol) in dry NMP (1.7 mL) and heated at 90° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with water, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (4:1-2:1), to give the product as a light yellow solid (20.2 mg, 8%).
In a sealed tube was placed 2-chloro-4-(4-cyclopropyl-2,6-dimethylphenoxy)-5H-pyrrolo[3,2-d]pyrimidine (20 mg, 0.064 mmol), 4-aminobenzonitrile (31 mg, 0.26 mmol), TFE (0.21 mL) and TFA (0.04 mL, 0.51 mmol). The reaction mixture was stirred at 90° C. for 16 h. Upon completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with NaHCO3, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by preparative TLC, eluting with 5% Acetone/CH2Cl2 to give the product as a light yellow solid (10.5 mg, 45%).
To a stirred suspension of NaH (8.9 mg, 0.22 mmol) in dry NMP (1.0 mL) was added 2,4,6-trimethyl phenol (30.2 mg, 0.22 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 2,4-dichloro-5-methyl-5H-pyrrolo[3,2-d]pyrimidine (44.6 mg, 0.22 mmol) in dry NMP (1.0 mL) and heated at 90° C. for 16 h. After completion of the reaction, the resulting mixture was cooled, diluted with water and washed with EtOAc. The combined organic layers were washed with water, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (5:1-2:1), to give the product as a light yellow solid (52.7 mg, 80%).
In a sealed tube was added 2-chloro-4-(mesityloxy)-5-methyl-5H-pyrrolo[3,2-d]pyrimidine (52.7 mg, 0.18 mmol), 4-aminobenzonitrile (83 mg, 0.70 mmol), TFE (1.0 mL) and TFA (0.11 mL, 1.44 mmol). The reaction mixture was stirred at 90° C. for 48 h. Upon completion of the reaction, the resulting mixture was cooled, diluted with water and washed with EtOAc. The combined organic layers were washed with NaHCO3, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by preparative TLC, eluting with hexanes:ethyl acetate (5:1-2:1), to give the product as a light yellow solid (65.7 mg, 95%).
To a stirred solution of NaH (42.1 mg, 1.05 mmol) in dry NMP (2.5 mL) was added 4-hydroxy-3,5-dimethylbenzonitrile (154.7 mg, 1.05 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 2,4-dichloro-5-methyl-5H-pyrrolo[3,2-d]pyrimidine (211.3 mg, 1.05 mmol) in dry NMP (2.7 mL) and heated at 160° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with water, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (3:1-1:1), to give the product as a light yellow solid (294 mg, 85%).
In a sealed tube was added 4-(2-chloro-5-methyl-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (294 mg, 0.94 mmol), 4-aminobenzonitrile (455 mg, 3.77 mmol), TFE (3.1 mL) and TFA (0.58 mL, 7.52 mmol). The reaction mixture was stirred at 90° C. for 48 h. Upon completion of the reaction, the resulting mixture was cooled, diluted with water and washed with EtOAc. The combined organic layers were washed with NaHCO3, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by preparative TLC, eluting with hexanes:ethyl acetate (4:1-1:2), to give the product as an off-white solid (133 mg, 40%).
To a stirred solution of NaH (31 mg, 0.78 mmol) in dry NMP (2 mL) was added 1-(4-hydroxy-3,5-dimethylphenyl)ethanone (127 mg, 0.78 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (216 mg, 0.78 mmol) in dry NMP (2.4 mL) and heated at 160° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed with water, 2% NaOH, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography, eluting with hexanes/ethyl acetate (4:1-2:1), to give the product as a light yellow solid (111 mg, 35%).
In a sealed tube was added 1-(4-(5-benzyl-2-chloro-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylphenyl)ethanone (111 mg, 0.27 mmol), 4-aminobenzonitrile (129 mg, 1.1 mmol), TFE (1.7 mL) and TFA (0.2 mL, 2.16 mmol). The reaction mixture was stirred at 90° C. for 16 h. Upon completion of the reaction, the resulting mixture was cooled, diluted with water, and washed with EtOAc. The combined organic layers were washed with NaHCO3 and brine; dried over Na2SO4; filtered; and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes:ethyl acetate (9:1-100% EtOAc), to give the product as an off-white solid (68 mg, 51%).
To a suspension of 4-(4-(4-acetyl-2,6-dimethylphenoxy)-5-benzyl-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (65 mg, 0.13 mmol) in 1,2-dichlorobenzene (5.3 mL) was added AlCl3 (178 mg, 1.3 mmol). The reaction mixture was heated at 160° C. for 1.5 h, after which time the reaction mixture became dark and homogeneous. Upon completion of the reaction, the reaction mixture was cooled, CHCl3 was added, and the mixture was washed with NH4Cl. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes:ethyl acetate (3:1), to give the product as a brown solid (41 mg, 77%).
To a stirred solution of NaH (80.4 mg, 1.0 mmol) in dry NMP (3 mL) was added 4-((dimethylamino)methyl)-2,6-dimethylphenol (216.4 mg, 1.0 mmol) and the mixture was stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (216 mg, 0.78 mmol) in dry NMP (2.6 mL) and heated at 120° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed twice with water, washed with, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with MeOH/CH2Cl2 (10%-30%), to give the product as a tan solid (71 mg, 17%).
In a sealed tube was added 1-(4-(5-benzyl-2-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylphenyl)-N,N-dimethylmethanamine (70.7 mg, 0.17 mmol), 4-aminobenzonitrile (78.9 mg, 0.67 mmol), TFE (1.1 mL) and TFA (0.1 mL, 1.3 mmol). The reaction mixture was stirred at 90° C. for 16 h. Upon completion of the reaction, the resulting mixture was cooled, diluted with water, and washed with EtOAc. The combined organic layers were washed with NaHCO3 solution and with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with MeOH/CH2Cl2 (20%-40%), to give the product as a tan solid (17 mg, 20%).
The benzyl group was removed according to the same procedure as described for example 13.
To a stirred solution of NaH (61.9 mg, 2.6 mmol) in dry NMP (4.7 mL) was added 2,6-dimethyl-4-nitrophenol (258.9 mg, 1.55 mmol) and stirred at room temperature for 30 min under argon. The reaction mixture was added to a solution of 5-benzyl-2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (431 mg, 1.55 mmol) in dry NMP (4 mL) and heated at 90° C. for 16 h. After completion of the reaction, the resulting mixture was diluted with water and washed with EtOAc. The combined organic layers were washed twice with water, washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes:ethyl acetate (3:1-1:1), to give the product as a white solid (598 mg, 94%).
In a sealed tube was added 5-benzyl-2-chloro-4-(2,6-dimethyl-4-nitrophenoxy)-5H-pyrrolo[3,2-d]pyrimidine (598 mg, 1.46 mmol), 4-aminobenzonitrile (691 mg, 5.85 mmol), TFE (9.1 mL) and TFA (1.97 mL, 11.7 mmol). The reaction mixture was stirred at 90° C. for 16 h. Upon completion of the reaction, the resulting mixture was cooled, diluted with water and washed with EtOAc. The combined organic layers were washed with NaHCO3, brine, dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by silica gel column chromatography, eluting with hexanes:ethyl acetate (3:1-1:1), to give the product (442 mg, 60%).
To a solution of 4-(4-(4-acetyl-2,6-dimethylphenoxy)-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (13 mg, 0.03 mmol) in CH2Cl2 (1 mL) was added NCS (4.4 mg, 0.03 mmol) and the mixture refluxed for 16 h. After the completion of the reaction, the solvent was concentrated and purified by preparative TLC eluting with hexanes:ethyl acetate (2:1) to give the product (4.2 mg, 30%).
To a solution of 4-(4-(mesitylthio)-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (10 mg, 0.02 mmol) in CH2Cl2 (5 mL) was added NCS (2.8 mg, 0.02 mmol) and the resolution mixture refluxed for 16 h. After the completion of the reaction, the solvent was concentrated and purified by preparative TLC, eluting with hexanes:ethyl acetate (3:1), to give the product (8.8 mg, 88%).
To a solution of 4-(4-(mesitylthio)-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (22.7 mg, 0.06 mmol) in CH2Cl2 (10 mL) was added NBS (10.5 mg, 0.06 mmol) and the resultant mixture was refluxed for 16 h. After completion of the reaction, the solvent was concentrated and purified by reversed phase HPLC to give the product as a white solid (6.4 mg, 23%).
To a solution of 4-(4-(mesityloxy)-5-methyl-5H-pyrrolo[3,2-d]pyrimidin-2-ylamino)benzonitrile (17.3 mg, 0.05 mmol) in CH2Cl2 (5 mL) was added NCS (6.03 mg, 0.05 mmol) and the resultant mixture was refluxed for 16 h. After completion of the reaction, the solvent was concentrated and purified by preparative TLC, eluting with hexanes:ethyl acetate (3:1), to give the product as an off-white solid (3.4 mg, 6%).
To a solution of 4-(2-(4-cyanophenylamino)-5-methyl-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (21.5 mg, 0.06 mmol) in CH2Cl2 (3 mL) was added NCS (7.3 mg, 0.06 mmol) and the resultant mixture was refluxed for 16 h. After completion of the reaction, the solvent was concentrated and purified by preparative TLC, eluting with Hexanes:Ethyl acetate (3:1), to give the product as a light yellow solid (13.2 mg, 56%).
To a solution of 4-(2-(4-cyanophenylamino)-5-methyl-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (58 mg, 0.15 mmol) in CH2Cl2 (8 mL) was added NBS (29 mg, 0.16 mmol) and the resultant mixture was refluxed for 16 h. After completion of the reaction, the solvent was concentrated and purified by preparative TLC, eluting with hexanes:ethyl acetate (2:1), to give the product as a yellow solid (40 mg, 57%).
To a solution of 4-(2-(4-cyanophenylamino)-5H-pyrrolo[3,2-d]pyrimidin-4-yloxy)-3,5-dimethylbenzonitrile (28.1 mg, 0.07 mmol) in CH2Cl2 (4 mL) was added NCS (9.9 mg, 0.07 mmol) and the resultant mixture was refluxed for 16 h. After completion of the reaction, the solvent was concentrated and purified by preparative TLC eluting with hexanes:ethyl acetate (2:1), to give the product as a pink solid (20 mg, 65%).
Biological Activity
Inhibition of HIV-1 Reverse Transcriptase
Numerous compounds were screened for inhibitory activity against human immunodeficiency virus type 1 (HIV-1) using a high throughput cell-based assay using HIV-1 expressing firefly luciferase as a reporter gene and pseudotyped with vesicular stomatitis virus envelope glycoprotein (VSV-G). Experimental procedures were essentially as described by Connor et al. in Journal of Virology (1996), 70: 5306-5311 (Characterization of the functional properties of env genes from long-term survivors of human immunodeficiency virus type 1 infection), and Popik et al. in Journal of Virology (2002), 76: 4709-4722 (Human immunodeficiency virus type 1 uses lipid raft-co-localized CD4 and chemokine receptors for productive entry into CD4+ T cells). It should be particularly appreciated that the virus contains two introduced mutations in the RT gene (K103N and Y181C, created by PCR mutagenesis) that render the virus highly resistant to current non-nucleoside HIV-1 drugs. Virus stocks were generated by cotransfection of plasmid DNA encoding VSV-G with vector pNL4-3Env(−)Luc(+) into 293T cells. Sixty-four hours after transfection, virus-containing medium was collected by centrifugation and stored frozen at −80° C.
HeLa cells were infected with the VSV-G pseudotyped virus in the presence of screening compounds in a 384-well microtiter plate format. Forty-eight hours after initial infection, lysis buffer and Luciferase Assay Reagent (Promega) was added to the cells and luciferase activity was determined by counting the resultant luminescence using a LJL luminometer. Since the luciferase gene is carried in the virus genome, its expression level directly reflects the virus replication level in the presence of a compound.
To evaluate the activity of the compounds against wild type HIV-1, the HeLa-JC53 cell line that expresses high levels of CD4 and CCR5 (see e.g., Platt et al. in Journal of Virology (1998), 72: 2855-2864: Effect of CCR5 and CD4 cell surface concentrations on infection by macrophagetropic isolates of human immunodeficiency virus type 1) was modified by isolation of a stable cell line that expresses luciferase under the control of the HIV-1 promoter (long terminal repeat, i.e., LTR). HIV-1 infection of this cell line stimulates the transcription of luciferase from the HIV-1 promoter and the luciferase gene expression level is proportional to the level of virus replication (Harrington et al. in Journal of Virology Methods (2000), 88: 111-115: Direct detection of infection of HIV-1 in blood using a centrifugation-indicator cell assay; and Roos et al. in Virology (2000), 273: 307-315: LuSIV cells: a reporter cell line for the detection and quantitation of a single cycle of HIV and SIV replication). Procedures for virus infection, compound testing and luciferase activity determination were the same as for the VSV-G pseudotyped HIV-1.
Two approaches were used to evaluate the cytotoxicity of the positive compounds discovered in the HIV-1 virus assays. The first approach employed another modified HeLa-JC53 cell line that constitutively expresses high level of luciferase without virus infection. The level of luciferase expression in these cells served as an indicator for cell replication in the presence of the compounds. Procedures for compound testing and luciferase activity determination were the same as for the virus infection tests. The other toxicity assay utilized HeLe-JC53 cells and a commercially available MTS assay kit (Promega) that measures the mitochondria function of the cells.
Results
The results are listed in Table A as EC50 (nM) and IC50 (nM). Table legend: A is <10, B is between 10 and 100, C is >100, ND is not determined. Note that many compounds of this invention exhibit activities on wild-type (WT) and resistant mutants below 10 nM.
Contemplated Compounds and Prophetic Examples
In addition to the examples listed above, this invention provides or contemplates many compounds, examples of which are shown in the tables that follow.
Additional contemplated and prophetic examples, which are not exhaustive but merely representative of this invention, are shown below:
This application claims priority to U.S. Provisional Application Ser. No. 60/678,667, filed May 5, 2005, the entirety of which is incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US2006/017677 | 5/5/2006 | WO | 00 | 1/14/2009 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2006/122003 | 11/16/2006 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 6271370 | Scott | Aug 2001 | B1 |
| 6414147 | Currie et al. | Jul 2002 | B1 |
| Number | Date | Country |
|---|---|---|
| WO-00-27850 | May 2000 | WO |
| WO-2000-043394 | Jul 2000 | WO |
| WO-03-016306 | Feb 2003 | WO |
| WO-2004-069812 | Aug 2004 | WO |
| WO-2005-028479 | Mar 2005 | WO |
| WO-2006-045828 | May 2006 | WO |
| WO-2006-122003 | Nov 2006 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 20090124802 A1 | May 2009 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60678667 | May 2005 | US |
