benzyl 7-((3aR,4R,7R,7aR)-7-methoxy-6,6-dimethyl-2-oxotetrahydro-3aH-[1.3]dioxolo[4,5-c]pyran-4-yloxy)-8-methyl-2-oxo-2H-chromen-3-yl carbamate 在
三乙胺 作用下,
以
甲醇 为溶剂,
反应 14.0h,
以82%的产率得到benzyl 7-((2R,3R,4S,5R)-3,4-dihydroxy-5-methoxy-6,6-dimethyltetrahydro-2H-pyran-2-yloxy)-8-methyl-2-oxo-2H-chromen-3-ylcarbamate