(2S,5R,6R,8R,10R)-2-[2-(benzyloxy)ethyl]-10-[(1S,2R,3R,5R,7S)-2-(tert-butyldimethylsilyl)oxy-7-(tert-butyldimethylsilyl)oxymethyl-3-methyl-6,8-dioxabicyclo[3.2.1]octan-5-ylmethyl]-5-methyl-1,7,9-trioxadispiro[5.1.5.2]pentadecan-5-ol 、
三乙基硅基三氟甲磺酸酯 在
2,6-二甲基吡啶 作用下,
以
二氯甲烷 为溶剂,
以94%的产率得到(2S,5R,6R,8R,10R)-2-[2-(benzyloxy)ethyl]-10-[(1S,2R,3R,5R,7S)-2-(tert-butyldimethylsilyl)oxy-7-(tert-butyldimethylsilyl)oxymethyl-3-methyl-6,8-dioxabicyclo[3.2.1]octan-5-ylmethyl]-5-methyl-5-(triethylsilyl)oxy-1,7,9-trioxadispiro[5.1.5.2]pentadecane