Chloro-acetic acid (2R,3R,4S,5S,6R)-5-acetoxy-4-benzyloxy-3-[(2S,3R,4R,5R,6R)-4,5-bis-benzyloxy-6-benzyloxymethyl-3-(2,2,2-trichloro-acetylamino)-tetrahydro-pyran-2-yloxy]-6-(4-methoxy-phenoxy)-tetrahydro-pyran-2-ylmethyl ester 在
硫脲 作用下,
以
吡啶 、
乙醇 为溶剂,
以97%的产率得到Acetic acid (2R,3S,4S,5R,6R)-4-benzyloxy-5-[(2S,3R,4R,5R,6R)-4,5-bis-benzyloxy-6-benzyloxymethyl-3-(2,2,2-trichloro-acetylamino)-tetrahydro-pyran-2-yloxy]-6-hydroxymethyl-2-(4-methoxy-phenoxy)-tetrahydro-pyran-3-yl ester