反应详情

The title compound was prepared from 2-(trifluoromethyl)-5,6,7,8-tetrahydroimidazo[1,2-α]pyrazine (31.7 mg, 0.166 mmol, from Example 1, Step B), (3R)-3-[(1,1-dimethylethoxycarbonyl)amino]-4-(2,4,5-trifluorophenyl)butanoic acid (Intermediate 3, 57 mg, 0.166 mmol), HOBT (26.9 mg,0.199 ) mmol, and EDC (47.8 mg, 0.249 mmol) in 4 mL of dichloromethane, using a procedure analogous to that described in Example 1, Step C. Purification by preparative TLC (silica gel, 100% ethyl acetate, then 10% methanol in dichloromethane) gave 40 mg of the title compound as a foamy solid. 1H NMR (500 MHz, CDCl3) δ 1.35 (s, 9H), 3.00 (m, 2H), 3.30 (m, 2H), 3.93 (m, 1H) 4.04-4.24 (m, 2H), 4.23 (s, 1H), 4.35 (m, 1H) 4.97-5.48 (m, 2H) 7.22 (m, 1H), 7.44 (m, 1H), 8.04 (m, 1H). ESI-MS 507 (M+1).

1. customPurification by preparative TLC (silica gel, 100% ethyl acetate