在
劳森试剂 、 4 A molecular sieve 作用下,
以
甲苯 为溶剂,
以90%的产率得到[(2R,3R,4S,5R,6R)-6-[[(1R,2S,9S,12S,13R,16S)-6-[(3R)-4-acetyloxy-3-methylbutyl]-7,9,13-trimethyl-5-thiapentacyclo[10.8.0.02,9.04,8.013,18]icosa-4(8),6,18-trien-16-yl]oxy]-4-(2,2-dimethylpropanoyloxy)-3,5-bis[[(2S,3R,4R,5S,6S)-3,4,5-tris(2,2-dimethylpropanoyloxy)-6-methyloxan-2-yl]oxy]oxan-2-yl]methyl 2,2-dimethylpropanoate