Highly Regioselective Copper-Catalyzed <i>cis</i>- and <i>trans</i>-1-Propenyl Grignard Cleavage of Hindered Epoxides. Application in Propionate Synthesis
作者:David Rodríguez、Marlenne Mulero、José A. Prieto
DOI:10.1021/jo060833t
日期:2006.7.1
Hindered protected and unprotected epoxy alcohols were regioselectively cleaved using copper-catalyzed cis- and trans-1-propenylmagnesium bromide. The reaction exhibited good yield and excellent regioselectivity in systems where organocuprates and organoalanes failed. The cis Grignardreagent displayed no double-bond isomerization, whereas the trans isomer showed partial trans-to-cis equilibration