Highly regioselective carbonylation of vinylsilanes: a remarkable effect of organosilicon substituent
作者:Ryo Takeuchi、Naomi Ishii、Nobuhiro Sato
DOI:10.1039/c39910001247
日期:——
The Pd-catalysed hydroesterification of vinylsilanes affords β-silyl esters 1 in high yields with high selectivity, whereas α-silyl esters 2 are obtained in high yields with high selectivity by the Co catalyst.
Pd 催化乙烯基硅烷的氢酯化反应以高产率和高选择性得到 β-甲硅烷基酯 1,而通过 Co 催化剂以高产率和高选择性获得 α-甲硅烷基酯 2。
The highly regioselective carbonylation of vinylsilanes
作者:Ryo Takeuchi、Naomi Ishii、Masaharu Sugiura、Nobuhiro Sato
DOI:10.1021/jo00041a025
日期:1992.7
The hydroesterification of vinylsilanes, catalyzed by transition-metal complexes, afforded both beta-silyl esters 2 and alpha-silyl esters 3 in high yield. The Pd(II) complex-catalyzed reaction showed high beta-regioselectivity, whereas the Co2(CO)8-catalyzed reaction showed high alpha-regioselectivity. Vinylsilanes which bore trialkyl-, diphenylmethyl-, dimethylethoxy-, trimethoxy-, diphenylfluoro-, and difluorophenylsilyl groups were regioselectively, and some cases regiospecifically, hydroesterified. Pd(II) complexes were also shown to be effective catalysts of the hydrocarboxylation of vinylsilanes. Hydrocarboxylation was beta-regiospecific and gave excellent yields of beta-silyl carboxylic acids. Reasonable mechanisms for the reactions are described.
The effect of substituents at silicon on the cross-metathesis of trisubstituted vinylsilanes with olefins
Efficient cross-metathesis of vinylsilanes, carrying a large spectrum of different substituents at silicon, with various olefins in the presence of the first and second generation Grubbs catalyst and Hoveyda–Grubbs catalyst is described. On the basis of the results of equimolar reactions of vinylsilanes with ruthenium alkylidene complexes and experiments with deuterium-labelled reagents, a general