[(E,2R,4R,5R,6S,9R,11S,16R)-5-[tert-butyl(dimethyl)silyl]oxy-1-[tert-butyl(diphenyl)silyl]oxy-17-[(2S,3S)-3-ethenyloxiran-2-yl]-9-hydroxy-4,11,12,16-tetramethyl-14-methylidene-7-oxo-6-triethylsilyloxyheptadec-12-en-2-yl] (2E)-2-methylhepta-2,6-dienoate 在
RuCl2(1,3-dimesityl-imidazolidin-2-yl)(PCy3)(=CHPh) 作用下,
以
苯 为溶剂,
反应 2.0h,
以54%的产率得到(1S,2E,6E,10R,12R,13R,14S,17R,19S,20E,24R,26S)-13-[tert-butyl(dimethyl)silyl]oxy-10-[[tert-butyl(diphenyl)silyl]oxymethyl]-17-hydroxy-7,12,19,20,24-pentamethyl-22-methylidene-14-triethylsilyloxy-9,27-dioxabicyclo[24.1.0]heptacosa-2,6,20-triene-8,15-dione