rac-1-((3aR,5R,11bR,12R)-8-(5-(tert-butoxy)furan-2-yl)-7,10-dihydroxy-6,11-dimethoxy-2,2,12-trimethyl-3a,4-dihydro-5H-5,11b-(epoxymethano)anthra[1,2-d][1,3]dioxol-9-yl)ethan-1-one 、
硫酸二甲酯 在
potassium carbonate 作用下,
以
丙酮 为溶剂,
反应 2.5h,
以77%的产率得到(1R*,2R*,4R*,12R*)-7-acetyl-6-(5-tert-butoxy-2-furyl)-1,2-(isopropylidenedioxy)-5,8,9,10-tetramethoxy-12-methyl-1,2,3,4-tetrahydro-4,1-(epoxymethano)anthracene-1,2-diol