反应详情

The title compound was prepared from 3-ethyl-5,6,7,8-tetrahydro-1,2,4-triazolo[4,3-a]pyrazine hydrochloride (400 mg, 2.12 mmol, from Step B), (3R)-3-[(1,1-dimethylethoxycarbonyl)amino]-4-(3,4-difluorophenyl)butanoic acid (668 mg, 2.12 mmol), DIPEA (1.1 mL, 4.24 mmol), HOBT (343.8 mg, 2.54 mmol) and EDC (609.6 mg, 3.18 mmol) in 20 mL of dichloromethane, using a procedure analogous to that described in Example 1, Step C. The crude product was purified by HPLC (Gilson; YMC-Pack Pro C18 column, 100×20 mm I.D.; solvent gradient from 10% acetonitrile, 90% water, and 0.1% trifluoroacetic acid to 90% acetonitrile, 10% water, and 0.% trifluoroacetic acid) to give 366.3 mg of the title compound as a viscous oil. 1H NMR (500 MHz, CDCl3) δ 1.31-1.34 (m, 12H), 2.67-2.92 (m, 6H), 4.03-4.12 (m, 4H), 5.03-5.31 (m, 3H), 6.93 (s, 1H), 7.05 (m, 2H). ESI-MS 450 (M+1).

1. customThe crude product was purified by HPLC (Gilson; YMC-Pack Pro C18 column, 100×20 mm I.D.; solvent gradient from 10% acetonitrile, 90% water, and 0.1% trifluoroacetic acid to 90% acetonitrile, 10% water, and 0.% trifluoroacetic acid)