Chloro-acetic acid (2R,3R,4S,5R,6S)-3,4,5-tris-benzyloxy-6-[(2R,3R,4S,5R,6S)-3,4,5-tris-benzyloxy-6-((2R,3R,4S,5R)-3,4,5-tris-benzyloxy-6-hydroxy-tetrahydro-pyran-2-ylmethoxy)-tetrahydro-pyran-2-ylmethoxy]-tetrahydro-pyran-2-ylmethyl ester 在
(chlorosulfinyloxy)-N,N-dimethylmethaniminium chloride 作用下,
以
1,2-二氯乙烷 为溶剂,
以75%的产率得到Chloro-acetic acid (2R,3R,4S,5R,6S)-3,4,5-tris-benzyloxy-6-[(2R,3R,4S,5R,6S)-3,4,5-tris-benzyloxy-6-((2R,3R,4S,5R,6R)-3,4,5-tris-benzyloxy-6-chloro-tetrahydro-pyran-2-ylmethoxy)-tetrahydro-pyran-2-ylmethoxy]-tetrahydro-pyran-2-ylmethyl ester