(2R,3R)-4-azido-2-benzyloxy-3-fluoro-butanoic acid 、 benzyl (4aR,6R,7R,8S,8aS)-6-[(1R,2R,3S,4R,6S)-2-[(2S,3R,4S,5R)-4-[[(4aS,6R,7R,8R,8aS)-8-hydroxy-2-phenyl-3-phenylmethoxycarbonyl-7-(phenylmethoxycarbonylamino)-4,4a,6,7,8,8a-hexahydro-2H-pyrano[2,3-e][1,3]oxazin-6-yl]oxy]-3-hydroxy-5-(hydroxymethyl)oxolan-2-yl]oxy-4-amino-3-hydroxy-6-(phenylmethoxycarbonylamino)cyclohexyl]oxy-8-hydroxy-2-phenyl-7-(phenylmethoxycarbonylamino)-4,4a,6,7,8,8a-hexahydro-2H-pyrano[2,3-e][1,3]oxazine-3-carboxylate 在
N-羟基丁二酰亚胺 、
N,N'-二环己基碳二亚胺 、
碳酸氢钠 作用下,
以
乙酸乙酯 、
四氢呋喃 为溶剂,
反应 25.0h,
以68.6%的产率得到