Compositions and methods for visible-light-controlled ruthenium-catalyzed olefin metathesis
申请人:The Trustees of Columbia University In The City of New York
公开号:US11331656B2
公开(公告)日:2022-05-17
The present disclosure provides compositions and methods for metathesizing a first alkenyl or alkynyl group with a second alkenyl or alkynyl group, the composition comprising a ruthenium metathesis catalyst and a photoredox catalyst that is activated by visible light.
A Tandem Ester Cleavage-Michael Addition Reaction for the Synthesis of Oxygen Heterocycles
作者:R. A. Bunce、M. J. Bennett
DOI:10.1080/00397919308013298
日期:1993.4
Abstract A tandem ester cleavage-Michael addition sequence has been developed for the preparation of five- and six-ring oxygen heterocycles bearing an acetic acid residue at C-2. Treatment of ethyl 6- or 7-acetyloxy-2-alkenoates with ethanolic sodium ethoxide affords the tetrahydrofuran and tetrahydropyran products in 70–90% yields. The reaction is clean and appears to be a generalroute for the preparation