Asymmetric Au(i)-catalyzed synthesis of bicyclo[4.1.0]heptene derivatives via a cycloisomerization process of 1,6-enynes
作者:Chung-Meng Chao、Denis Beltrami、Patrick Y. Toullec、Véronique Michelet
DOI:10.1039/b913554e
日期:——
presence of a chiral cationic Au(i) catalyst ((R)-4-MeO-3,5-(t-Bu)(2)-MeOBIPHEP-(AuCl)(2)/AgOTf system) in toluene under mild conditions and lead to functionalized bicyclo[4.1.0]heptenederivatives in excellent enantiomeric excesses ranging from 90-98%.
Asymmetric Au-catalyzed cycloisomerization of 1,6-enynes: An entry to bicyclo[4.1.0]heptene
作者:Alexandre Pradal、Chung-Meng Chao、Patrick Y Toullec、Véronique Michelet
DOI:10.3762/bjoc.7.116
日期:——
A comprehensive study on the asymmetric gold-catalyzedcycloisomerizationreaction of heteroatom tethered 1,6-enynes is described. The cycloisomerizationreactions were conducted in the presence of the chiral cationic Au(I) catalyst consisting of (R)-4-MeO-3,5-(t-Bu)(2)-MeOBIPHEP-(AuCl)(2) complex and silver salts (AgOTf or AgNTf(2)) in toluene under mild conditions to afford functionalized bicyclo[4