1,1-二溴乙烷 、
[(1R,3S,5R,6S,8R,10S,12R,13S)-13-[tert-butyl(dimethyl)silyl]oxy-12-[[tert-butyl(dimethyl)silyl]oxymethyl]-3,5,13-trimethyl-6-[(Z)-pent-3-enyl]-2,7,11-trioxatricyclo[8.5.0.03,8]pentadec-14-en-5-yl] 2-[(1R,3R,5S,6R,8S,10R,12S,14S)-12-[3-[tert-butyl(diphenyl)silyl]oxypropyl]-1,3-dimethyl-5-triethylsilyloxy-14-tri(propan-2-yl)silyloxy-2,7,11-trioxatricyclo[8.4.0.03,8]tetradecan-6-yl]acetate 在
lead(II) chloride
四甲基乙二胺 、
四氯化钛 、
锌 作用下,
以
四氢呋喃 、
二氯甲烷 为溶剂,
以60%的产率得到tert-butyl-[3-[(1R,3R,4S,6S,8R,10S,12R,13S)-12-[[(1R,3S,9R,11S,13R,16S,17R,19S)-16-[tert-butyl(dimethyl)silyl]oxy-17-[[tert-butyl(dimethyl)silyl]oxymethyl]-9,11,16-trimethyl-2,8,12,18-tetraoxatetracyclo[9.9.0.03,9.013,19]icosa-6,14-dien-7-yl]methyl]-1,3-dimethyl-13-triethylsilyloxy-4-tri(propan-2-yl)silyloxy-2,7,11-trioxatricyclo[8.4.0.03,8]tetradecan-6-yl]propoxy]-diphenylsilane