Preparation of Optically Active <i>cis</i>-Cyclopropane Carboxylates: Cyclopropanation of α-Silyl Stryenes with Aryldiazoacetates and Desilylation of the Resulting Silyl Cyclopropanes
作者:Yan Su、Qing-Fang Li、Yu-Ming Zhao、Peiming Gu
DOI:10.1021/acs.orglett.6b02117
日期:2016.9.2
Opticallyactive cis-cyclopropane carboxylates are prepared via the Rh2(S-PTAD)4-catalyzed cyclopropanation of α-silyl styrenes with aryl diazoacetates followed by desilylation of the resulting silyl cyclopropane carboxylates. The conjugation of the aryl ring with C═C bond and π stacking are proposed for the stereoselectivity of cyclopropanation, and configuration inversion is observed with the desilylation