、
在
(1-cyano-2-ethoxy-2-oxoethylidenaminooxy)dimethylaminomorpholinocarbenium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基乙酰胺 为溶剂,
以23%的产率得到(2R,3S)-N-[(2S)-1-[2-[2-[2-[[(3S)-4-[3-[2-[2-[3-[5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]propoxy]ethoxy]ethoxy]propylamino]-3-[(4-azido-2,3,5,6-tetrafluorobenzoyl)amino]-4-oxobutanoyl]amino]ethoxy]ethoxy]ethylamino]-3,3-dimethyl-1-oxobutan-2-yl]-N',3-dihydroxy-2-(2-methylpropyl)butanediamide