Highly Regio- and Stereoselective Hydrosilylation of Internal Thioalkynes under Mild Conditions
作者:Shengtao Ding、Li-Juan Song、Yong Wang、Xinhao Zhang、Lung Wa Chung、Yun-Dong Wu、Jianwei Sun
DOI:10.1002/anie.201500372
日期:2015.5.4
A general and mildhydrosilylation of thioalkynes is described. With the cationic catalyst [Cp*Ru(MeCN)3]+ and the bulky silane (TMSO)3SiH, a range of thioalkynes underwent smooth hydrosilylation at room temperature with excellent α regioselectivity and syn stereoselectivity. DFT calculations provided important insight into the mechanism, particularly the unusual syn selectivity with the [Cp*Ru(MeCN)3]+
thioalkynes with exclusive stereoselectivity facilitated by an organic base, which could proceed exceedingly fast under ambient atmosphere and room temperature, affording β trans addition products in up to nearly quantitative yields. The dual nature of the sulfur atom in attracting and donating electrons is supposed to be pivotal in determining the regio- and stereoselectivity. This system tolerates a