2-((S)-2-Allyloxycarbonylamino-1-tert-butoxycarbonylamino-ethyl)-oxazole-4-carboxylic acid 、 2-((S)-2-Allyloxycarbonyl-1-amino-ethyl)-thiazole-4-carboxylic acid tert-butyl ester; compound with trifluoro-acetic acid 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 36.0h,
以94%的产率得到2-((S)-2-Allyloxycarbonyl-1-{[2-((S)-2-allyloxycarbonylamino-1-tert-butoxycarbonylamino-ethyl)-oxazole-4-carbonyl]-amino}-ethyl)-thiazole-4-carboxylic acid tert-butyl ester