反应详情

6-(2-Amino-5-bromo-phenylcarbamoyl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester and 6-(2-Amino-4-bromo-phenylcarbamoyl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester: 5-Aza-spiro[2.4]heptane-5,6-dicarboxylic acid 5-benzyl ester 6 methyl ester (987 mg, 3.41 mmol) was dissolved in EtOH (10 mL) and LiOH (1 M in H2O, 5 mL, 5 mmol) was added. After stirring for 2 hours at 50° C., the reaction mixture was poured into 10% HCl and the aqueous phase was extracted 3× with DCM. The combined organics were dried over MgSO4, filtered and concentrated. The residue was treated with 4-Bromo-benzene-1,2-diamine (1.60 g, 8.53 mmol), HATU (1.43 g, 3.75 mmol) and DMF (17 mL) then cooled to 0° C. DIPEA (0.712 mL, 4.09 mmol) was added and the reaction mixture was allowed to warm to room temperature slowly overnight. The reaction mixture was then diluted with EtOAc and the organic layer was washed with saturated aqueous NaHCO3 and brine then dried over MgSO4, filtered and concentrated. The crude material was purified by silica column chromatography to afford a mixture of 6-(2-Amino-5-bromo-phenylcarbamoyl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester and 6-(2-Amino-4-bromo-phenylcarbamoyl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester (1.47 g, 97%). 6-(6-Bromo-1H-benzoimidazol-2-yl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester: A mixture of 6-(2-Amino-5-bromo-phenylcarbamoyl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester and 6-(2-Amino-4-bromo-phenylcarbamoyl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester (1.446 g, 3.25 mmol) was dissolved in AcOH (20 mL) and the reaction mixture was stirred at 40° C. for 18 hours then concentrated under reduced pressure. The residue was dissolved in EtOAc and washed with saturated aqueous NaHCO3. The aqueous layer was extracted 2× with EtOAc and the combined organics were dried over MgSO4, filtered and concentrated to provide 6-(6-Bromo-1H-benzoimidazol-2-yl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester (1.385 g, 100%). {1-[6-(6-Bromo-1H-benzoimidazol-2-yl)-5-aza-spiro[2.4]heptane-5-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester: 6-(6-Bromo-1H-benzoimidazol-2-yl)-5-aza-spiro[2.4]heptane-5-carboxylic acid benzyl ester (301 mg, 0.706 mmol) was dissolved in DCM (10 mL) and HBr (33 wt % in AcOH, 5 mL) was added. After 2 h the reaction mixture was concentrated and placed under hi-vac. The residue was co-evaporated with PhMe, MeOH, then again with PhMe and MeOH and placed under hi-vac. The residue was treated with 2-Methoxycarbonylamino-3-methyl-butyric acid (130 mg, 0.741 mmol, HATU (282 mg, 0.741 mmol) and DMF (7 mL). The reaction mixture was cooled to 0° C. then DIPEA (0.615 mL, 3.53 mmol) was added before warming to room temperature. After 30 minutes, the reaction mixture was diluted with EtOAc and the organic phase was washed with saturated aqueous NaHCO3 and brine, then dried over MgSO4, filtered and concentrated. The crude residue was purified by silica column chromatography (50% to 80% EtOAc/hexane) to afford {1-[6-(6-Bromo-1H-benzoimidazol-2-yl)-5-aza-spiro[2.4]heptane-5-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (238 mg, 75%). (2-Methyl-1-{6-[6-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-benzoimidazol-2-yl]-5-aza-spiro[2.4]heptane-5-carbonyl}-propyl)-carbamic acid methyl ester: Title compound was prepared according to the method employed to prepare Methyl-1-{2-[4′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-biphenyl-4-ylcarbamoyl]-pyrrolidine-1-carbonyl}-propyl)-carbamic acid methyl ester (Example CY), substituting {1-[6-(6-Bromo-1H-benzoimidazol-2-yl)-5-aza-spiro[2.4]heptane-5-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester for {1-[2-(4′-Bromo-biphenyl-4-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester. (1-[4-Cyano-2-[5-(9,9-difluoro-7-{2-[5-(2-methoxycarbonylamino-3-methyl-butyryl)-5-aza-spiro[2.4]hept-6-yl]-3H-benzoimidazol-5-yl}-9H-fluoren-2-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl]-2-methyl-propyl)-carbamic acid methyl ester: Title compound was prepared according to the method employed to prepare [1-(2-{5-[6-(4-{2-[1-(2-Methoxycarbonylamino-3-methyl-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenyl)-naphthalen-2-yl]-1H-imidazol-2-yl}-pyrrolidine-1-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester (Example AZ), substituting (1-{2-[5-(7-Bromo-9,9-difluoro-9H-fluoren-2-yl)-1H-imidazol-2-yl]-4-cyano-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester for (1-{2-[5-(4-bromo-phenyl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester and (2-Methyl-1-{6-[6-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-benzoimidazol-2-yl]-5-aza-spiro[2.4]heptane-5-carbonyl}-propyl)-carbamic acid methyl ester for [2-methyl-1-(2-{5-[6-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-naphthalen-2-yl]-1H-imidazol-2-yl}-pyrrolidine-1-carbonyl)-propyl]-carbamic acid methyl ester. 1H NMR (DMSO-d6, 400 MHz) δ: 8.07-7.55 (m, 9H), 7.34 (m, 2H), 5.31 (m, 1H), 5.11 (m, 1H), 4.45 (m, 1H), 4.08-3.87 (m, 6H), 3.63-3.54 (m, 9H), 3.41-3.28 (m, 4H), 2.73 (m, 1H), 2.40-2.25 (m, 2H), 2.15-2.13 (m, 1H), 1.95 (m, 3H), 0.93-0.83 (m, 12H), 0.74-0.57 (m, 4H); MS (ESI) m/z 889 [M+H]+.