The Direct Asymmetric Vinylogous Aldol Reaction of Furanones with α-Ketoesters: Access to Chiral γ-Butenolides and Glycerol Derivatives
作者:Jie Luo、Haifei Wang、Xiao Han、Li-Wen Xu、Jacek Kwiatkowski、Kuo-Wei Huang、Yixin Lu
DOI:10.1002/anie.201006316
日期:2011.2.18
Twice as good: The title reaction using the tryptophan‐derived bifunctional organic catalyst 1 has been developed. The reported method led to the synthesis of chiral γ‐substituted butenolides in excellent yields, with high diastereo‐ and enantioselectivities. Facile synthesis of chiralglycerolderivatives containing a tertiary hydroxy group has also been demonstrated.
N-Heterocyclic Carbene-Catalyzed Vinylogous Mukaiyama Aldol Reaction of α-Keto Esters and α-Trifluoromethyl Ketones
作者:Guang-Fen Du、Ying Wang、Fen Xing、Mei Xue、Xu-Hong Guo、Kuo-Wei Huang、Bin Dai
DOI:10.1055/s-0035-1560833
日期:——
N-Heterocyclic carbene (NHC)-catalyzed vinylogous Mukaiyama aldol reaction of ketones was developed. Under the catalysis of 5 mol% NHC, -keto esters and -trifluoromethyl ketones reacted with 2-(trimethysilyloxy)furan efficiently to produce -substituted butenolides containing adjacent quaternary and tertiary carbon centers in high yields with good diastereoselectivities.