(S)-2-Benzyloxycarbonylamino-3-((2S,3R,4R,5R,6R)-4,5-diacetoxy-6-acetoxymethyl-3-azido-tetrahydro-pyran-2-yloxy)-propionic acid heptyl ester 以88%的产率得到(S)-2-Benzyloxycarbonylamino-3-((2S,3R,4R,5R,6R)-4,5-diacetoxy-6-acetoxymethyl-3-azido-tetrahydro-pyran-2-yloxy)-propionic acid