Catalytic Asymmetric Transannulation of N<i>H</i>-1,2,3-Triazoles with Olefins
作者:Sen Wai Kwok、Li Zhang、Neil P. Grimster、Valery V. Fokin
DOI:10.1002/anie.201306706
日期:2014.3.24
A convenient one‐pot asymmetric synthesis of 2,3‐dihydropyrroles from in situ generated triflated triazoles and olefins is described that further expands the utility of azavinyl carbene chemistry and provides access to an important class of cyclic enamides. Mechanistic investigations support the involvement of triflated cyclopropylaldimine intermediates in the formation of 2,3‐dihydropyrrole. To the
Rhodium-Catalyzed Enantioselective Cyclopropanation of Olefins with <i>N</i>-Sulfonyl 1,2,3-Triazoles
作者:Stepan Chuprakov、Sen Wai Kwok、Li Zhang、Lukas Lercher、Valery V. Fokin
DOI:10.1021/ja908075u
日期:2009.12.23
N-Sulfonyl 1,2,3-triazoles readily form rhodium(II) azavinyl carbenes, which react with olefins to produce cyclopropanes with excellent diastereo- and enantioselectivity and in high yield.