methyl (2R,3S,4S,5S)-5-[[tert-butyl(dimethyl)silyl]oxymethyl]-3,4-dihydroxy-2-[1-(4-methylphenyl)sulfonylindol-2-yl]oxolane-3-carboxylate 、
2,2-二甲氧基丙烷 在
对甲苯磺酸 作用下,
以
丙酮 为溶剂,
反应 16.0h,
以83%的产率得到methyl (3aR,4R,6S,6aS)-6-(hydroxymethyl)-2,2-dimethyl-4-[1-(4-methylphenyl)sulfonylindol-2-yl]-6,6a-dihydro-4H-furo[3,4-d][1,3]dioxole-3a-carboxylate