Vinyldiazolactone as a Vinylcarbene Precursor: Highly Selective C−H Insertion and Cyclopropanation Reactions
作者:Darren Bykowski、Kou-Hui Wu、Michael P. Doyle
DOI:10.1021/ja066452e
日期:2006.12.1
Vinylcarbenes are versatile synthetic intermediates, capable of asymmetric cyclopropanation and insertion into unactivated C-H bonds. The vinyldiazolactone precursor to the metal vinylcarbene possesses superior stability in comparison to previously known vinyldiazoacetates and, for the first time, allows the use of Z-vinylcarbenes in asymmetric C-H insertion and cyclopropanation reactions. Dirhodium azetidinone ligated compounds are optimal catalysts. Cyclopropanation coupled with the Cope rearrangement provides access to trans-3,4-disubstituted hydroazulenes.