Synthesis of Unsaturated Silyl Heterocycles via an Intramolecular Silyl-Heck Reaction
作者:William B. Reid、Jesse R. McAtee、Donald A. Watson
DOI:10.1021/acs.organomet.9b00498
日期:2019.10.14
We report the synthesis of unsaturated silacycles via an intramolecular silyl-Heck reaction. Using palladium catalysis, silicon electrophiles tethered to alkenes cyclize to form 5- and 6-membered silicon heterocycles. The effects of alkene substitution and tether length on the efficiency and regioselectivity of the cyclizations are described. Finally, through the use of an intramolecular tether, the
The intramolecular hydrosilylation of (4-pentenyl)hydrosilanes with transitionmetal salt catalysts afforded five- and six-membered ring-closure products in high yields, with the former predominating. This has been rationalized in terms of a reaction scheme based on the Harrod—Chalk mechanism in which both Si-metal and C-metal bonds were involved. The seven-membered intermediate leading to the six-membered