Water → 4-Methanesulfonyl-2-methoxycarbonylamino-butyric acid

Participants

Reaction Steps

Methyl chloroformate (2.6 mL, 33 mmol) was added dropwise to a stirred suspension of 2-Amino-4-methanesulfonyl-butyric acid (5.03 g, 27.8 mmol) and NaOH (5 N in H2O, 13.3 mL, 66.6 mmol) in THF (50 mL). After stirring at room temperature for 9 h, additional methyl chloroformate (5.2 mL, 66.6 mmol) and NaOH (5 N in H2O, 30 mL, 150 mmol) were added. After another 14 h, the reaction mixture was poured into H2O. The aqueous phase was washed with DCM 2× then acidified to pH 1 with 10% HCl. The acidified aqueous phase was extracted 3× with EtOAc. The combined organics were dried over MgSO4, filtered and concentrated to provide 4-Methanesulfonyl-2-methoxycarbonylamino-butyric acid (970 mg, 15%). (1-{2-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-4-cyano-pyrrolidine-1-carbonyl}-3-methanesulfonyl-propyl)-carbamic acid methyl ester: Title compound was prepared according to the method employed to prepare {1-[2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (Example CX), substituting 2-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-4-cyano-pyrrolidine-1-carboxylic acid tert-butyl ester for 2-(4′-Chloro-biphenyl-3-ylcarbamoyl)-pyrrolidine-1-carboxylic acid tert-butyl ester and 4-Methanesulfonyl-2-methoxycarbonylamino-butyric acid for 2-methoxycarbonylamino-3-methyl-butyric acid. [1-(6-{5-[6-(4-{2-[4-Cyano-1-(4-methanesulfonyl-2-methoxycarbonylamino-butyryl)-pyrrolidin-2-yl]-3H-imidazol-4-yl}-phenyl)-naphthalen-2-yl]-1H-imidazol-2-yl}-5-aza-spiro[2.4]heptane-5-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}-phenyl)-naphthalen-2-yl]-1H-imidazol-2-yl}-pyrrolidine-1-carbonyl)-2-methyl-propyl]-carbamic acid methyl ester (Example AZ), substituting (1-{2-[5-(4-Bromo-phenyl)-1H-imidazol-2-yl]-4-cyano-pyrrolidine-1-carbonyl}-3-methanesulfonyl-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-{5-[6-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-naphthalen-2-yl]-1H-imidazol-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 (MeOH-d4, 400 MHz) δ: 8.09-8.07 (m, 2H), 7.92-7.22 (m, 8H), 7.42-7.38 (m, 2H), 5.33 (t, J=7.5 Hz, 1H), 5.21 (t, J=8.0 Hz, 1H), 4.65 (m, 1H), 4.49 (m, 1H), 4.17-4.11 (m, 2H), 3.95 (d, J=9.6 Hz, 1H), 3.83 (d, J=10.2 Hz, 1H), 3.66 (s, 6H), 3.55-3.49 (m, 3H), 3.19-3.15 (m, 3H), 2.94 (s, 3H), 2.89-2.03 (m, 10H), 1.03-0.64 (m, 14H); MS (ESI) m/z 904 [M+H]+.

Provenance & Evidence