反应详情

A mixture of N-[2-(1H-tetraazol-1-yl)-5-(trifluoromethyl)benzyl]-L-prolinamide hydrochloride (35 mg, 0.09 mmol), N-(tert-butoxycarbonyl)-4-methyl-D-leucine (24 mg, 0.10 mmol), EDC (27 mg, 0.14 mmol), HOAt (6.3 mg, 0.05 mmol) and Hünig's base (34 mL, 0.20 mmol) in DMF (1.2 mL) was stirred at room temperature for 16 h. The title compound was isolated by extractive workup (EtOAc) and silica gel chromatography (60%-80% EtOAc-hexanes) as an oily foam which was carried on directly to the deprotection step. 1H NMR (400 MHz, CDCl3): δ 9.20 (s, 1H), 7.88 (s, 1H), 7.78 (br m, 1H), 7.71 (d, J=8.2 Hz, 1H), 7.45 (d, J=8.0 Hz, 1H), 4.97 (d, J=6.0 Hz, 1H), 4.59 (d, J=6.4 Hz, 1H), 4.32–4.20 (m, 2H), 3.99–3.95 (m, 1H), 3.51–3.45 (m, 1H), 2.31–2.29 (m, 1H), 2.05–1.92 (m, 3H), 1.62–1.52 (m, 2H), 1.28 (s, 9H), 1.01 (s, 9H). LCMS (M+H): 568.3.