Unexpected results of enyne metathesis using a ruthenium complex containing an N-heterocyclic carbene ligand
作者:Tsuyoshi Kitamura、Yoshihiro Sato、Miwako Mori
DOI:10.1039/b101453f
日期:——
Metathesis of enyne having 1,1-substituted alkene, carried out with the new generation of a rutheniumcarbene complex containing an N-heterocycliccarbeneligand, gave five- and six-membered cyclic compounds in high yield.
In ring-closing metathesis (RCM) reactions of enynes, the substituents on the multiplebonds are quite important. Although RCM of an enyne having a monosubstituted alkene proceeds smoothly using the first-generation ruthenium-carbene complex 1a, that of an enyne having a disubstituted alkene and internal alkyne using 1a does not proceed. However, the second-generation ruthenium-carbene complex 1b or