反应详情

Preparation of example 59 from the title compound of Example 7 (70 mg, 0.25 mmol), (2R)-[(tert-butoxycarbonyl)amino](cyclohexyl)ethanoic acid (98 mg, 0.38 mmol), triethylamine (0.139 mL, 1.0 mmol), and O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (144 mg, 0.38 mmol) in N,N-dimethylformamide (2.0 mL) was carried out analogously to Example 11 except that after 24 hours additional (2R)-[(tert-butoxycarbonyl)amino](cyclohexyl)ethanoic acid (32 mg, 0.13 mmol) and O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (48 mg, 0.13 mmol) were added to drive the reaction to completion. Silica gel chromatography (1:1 ethyl acetate:hexane), also in an analogous manner, followed by diethyl ether trituration afforded the title compound (90 mg, 0.17 mmol) as a yellow powder in 70% yield.

1. customafter 24 hours
2. additionwere added
3. customthe reaction to completion