methyl 2-azido-4,6-O-benzylidene-2-deoxy-β-D-galactopyranoside 、
(2R,3S,4S,5R,6R)-5-Benzoyloxy-4-benzyloxy-3-(4-oxo-pentanoyloxy)-6-pent-4-enyloxy-tetrahydro-pyran-2-carboxylic acid methyl ester 在
N-碘代丁二酰亚胺 、
三氟甲磺酸 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
反应 0.25h,
以90%的产率得到(2R,3S,4S,5R,6R)-6-((4aR,6R,7R,8R,8aR)-7-Azido-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-5-benzoyloxy-4-benzyloxy-3-(4-oxo-pentanoyloxy)-tetrahydro-pyran-2-carboxylic acid methyl ester