Copper-catalyzed cyclization reaction: synthesis of trifluoromethylated indolinyl ketones
作者:Wangqin Ji、Hai-Hong Wu、Wenbo Li、Junliang Zhang
DOI:10.1039/d1cc00960e
日期:——
A novel, simple, effective and rapid synthetic method to construct the C-2 trifluoromethylated indolinyl ketones via a copper-catalyzed cyclization reaction between N-alkylaniline and β-(trifluoromethyl)-α,β-unsaturated enones was developed. The results of the control experiments show that the reaction may involve a radical mechanism by a single-electron transfer process. Moreover, a broad substrate
practical phosphine‐catalyzed vicinal difunctionalization of β‐fluoroalkyl α,β‐enones with TMSN3 has been developed. Using dppb as the catalyst, the reaction worked efficiently to yield various β‐amino α‐diazocarbonyl compounds in high yields (up to 94 %). This work marks the first efficient construction of α‐diazocarbonyl compounds by phosphine catalysis. Meanwhile, the asymmetric variant induced by the
contiguous three stereocenters has been a long-standing challenging task in organic synthesis. Herein we present a phoshine-catalyzed highly regio-, diastereo- and enantioselective [3+2] cycloaddition of γ-substitutedallenoates with β-perfluoroalkyl enones, delivering a wide range of densely functionalized perfluoroalkylated cyclopentenes with three contiguous chiral stereocenters.
An efficient organocatalyzedenantioselective conjugated addition of sodium bisulfite to β-trifluoromethyl-α,β-unsaturated ketones using a cinchona alkaloid-derived squaramidecatalyst is presented. A series of optically active sulfonic acids, bearing a tertiary stereocenter connecting a CF3 group and a SO3H group, were obtained in excellent yields with high enantioselectivities (up to 99% yield and
Organocatalytic enantioselective sulfa-Michael addition of thiocarboxylic acids to β-trifluoromethyl-α,β-unsaturated ketones for the construction of stereogenic carbon center bearing a sulfur atom and a trifluoromethyl group
organocatalyzed asymmetric sulfa-Michael addition of thiocarboxylic acids to β-trifluoromethyl-α,β-unsaturated ketones with a chiral bifunctional amine-squaramide as the catalyst is presented. A wide range of chiral ketone compounds bearing a sulfur atom and a trifluoromethyl group at the stereogenic carbon center could be obtained with excellent results (up to 99% yield, 97% ee) under mild conditions. The developed