反应详情

TBTU (0.021 g, 0.067 mmol) was added to a solution of N-{[4-((2R,3R)-1-(4-fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl}glycine (0.030 g, 0.056 mmol) and N-methyl morpholine (0.017 g, 0.166 mmol) in CH2Cl2 (5 ml) at 30° C. After 1.5 h, D-tert-leucine (0.011 g, 0.083 mmol) was added. Full conversion to the corresponding amide was obtained after 30 minutes. The reaction was quenched by the addition of water (1 ml). After 10 minutes, MeOH (3 ml) and NaBH (0.042 g, 1.11 mmol) were added. After 5 minutes, the reaction was quenched by the addition of 0.1M NH4OAc buffer (1 ml). The reaction mixture was concentrated and purified by preparative HPLC using an eluent of 0-50% CH3CN in 0.1M N4OAc buffer. The title compound (0.025 g, 69%) was obtained as a colourless solid. M/z: 654.0 (M−1). 1H NMR [(CD3)2SO), 400 MHz] δ 0.86 (s, 9H), 2.82-2.98 (m, 2H), 3.76-3.81 (m, 2H), 3.92-3.96 (m, 1H), 4.26-4.33 (m, 1H), 4.52 (s, 2H), 4.68-4.76 (m, 1H), 5.02-5.07 (m, 1H), 6.97-7.37 (m, 12H), 7.58-7.63 (m, 1H), 8.29-8.34 (m, 1H).