Ring Closing Enyne Metathesis: Control over Mode Selectivity and Stereoselectivity
作者:Eric C. Hansen、Daesung Lee
DOI:10.1021/ja045422d
日期:2004.11.1
3-dienes were improved by performing these reactions under ethylene atmosphere. The presence of ethylene induces a selective cross metathesis between the alkyne moiety and ethylene to generate an acyclic 1,3-diene which can undergo ring closing diene metathesis between the isolated olefin and the distal monosubstituted double bond of the 1,3-diene to generate exclusively the endo-product with high E-selectivity