Organocatalytic Asymmetric Benzylation and Aldol-Hemiacetalization of α,β-Unsaturated Trifluoromethyl Ketones: Efficient Enantioselective Construction of 3,4-Dihydroisocoumarins
作者:Jindian Duan、Yuyu Cheng、Jing Cheng、Rou Li、Pengfei Li
DOI:10.1002/chem.201604920
日期:2017.1.12
developed for the organocatalytic enantioselective benzylation and aldol‐hemiacetalization of α,β‐unsaturated trifluoromethyl ketones with toluene derivatives in the presence of a tertiary amine‐thiourea catalyst. This method represents a facile and efficient strategy for the asymmetric synthesis of opticallyactive 3,4‐dihydroisocoumarins bearing a trifluoromethylated tetrasubstituted carbon stereocenter
The first catalytic enantioselectiveFriedel–Craftsalkylation of indoles with α,β-unsaturated trifluoromethyl ketones has been accomplished. The reaction was achieved in the presence of the Dy(OTf)3/Pybox complex, producing the desired products in high yields (up to 99%) with good enantioselectivities (up to 86% ee). The absolute stereochemistry of the resulting adducts was determined by X-ray analysis