2,2-二甲氧基丙烷 、
(3R,3aS,4R,5S,6R,7aR)-3-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4,5-dihydroxy-6-(2,5,5-trimethyl-[1,3]dioxan-2-yl)-hexahydro-isobenzofuran-1-one 在
对甲苯磺酸 作用下,
以
二氯甲烷 为溶剂,
以90%的产率得到(3aS,4R,5aR,8R,8aS,8bR)-8-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2,2-dimethyl-4-(2,5,5-trimethyl-[1,3]dioxan-2-yl)-hexahydro-furo[3',4':3,4]benzo[1,2-d][1,3]dioxol-6-one