Radical adducts of S-α-ketonyl dithiocarbonates (xanthates) to triethyl vinylsilane are converted into triethylsilyl-substituted cyclopropanes upon ozonolysis followed by exposure to 1,4-dibromobutane and Cs2CO3/18-crown-6 in refluxing acetonitrile. The sequence works best with phenacyl type adducts, and the use of the less bulky trimethysilyl (TMS) derivatives results in extensive desilylation.
                                    S -α-酮基二
硫代
碳酸酯(黄原酸酯)与三乙基
乙烯基硅烷的自由基加合物在
臭氧分解后转化为三乙基甲
硅烷基取代的
环丙烷,然后在回流的
乙腈中暴露于
1,4-二溴丁烷和Cs 2 CO 3 / 18-crown-6。该序列最适用于苯甲酰基型加合物,使用体积较小的三甲基甲
硅烷基(TMS)衍
生物会导致大量的甲
硅烷基化。