(S)-1-((S)-4-Benzyl-4,5-dihydro-oxazol-2-yl)-ethylamine 、 alkaline earth salt of/the/ methylsulfuric acid 在
sodium cyanide 作用下,
以
四氢呋喃 为溶剂,
反应 5.0h,
以83%的产率得到[(R)-2-((S)-2-{(R)-1-[(S)-1-((S)-4-Benzyl-4,5-dihydro-oxazol-2-yl)-ethylcarbamoyl]-2-phenyl-ethylcarbamoyl}-pyrrolidin-1-yl)-1-(diphenyl-phosphinothioylmethyl)-2-oxo-ethyl]-carbamic acid tert-butyl ester