、
allyl O-(2,3,4-tri-O-benzyl-α-D-glucopyranosyl)-(1<*>6)-O-2,3,6-tri-O-benzyl-α-D-glucopyranoside 在
4 A molecular sieve 、
氰化汞 、 mercury dibromide 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 6.0h,
以83%的产率得到Chloro-acetic acid (2R,3R,4S,5R,6S)-6-[(2R,3R,4S,5R,6S)-6-((2R,3R,4S,5R,6R)-6-allyloxy-3,4,5-tris-benzyloxy-tetrahydro-pyran-2-ylmethoxy)-3,4,5-tris-benzyloxy-tetrahydro-pyran-2-ylmethoxy]-3,4,5-tris-benzyloxy-tetrahydro-pyran-2-ylmethyl ester