Poly(methylhydrosiloxane) as a reductant in the catalytic base-free Wittig reaction
作者:Jan Tönjes、Lars Longwitz、Thomas Werner
DOI:10.1039/d1gc00953b
日期:——
catalytic, base-free Wittigreaction forming highly functionalized alkenes with PMHS as a terminal reductant and butylacetate as a green solvent. Poly(methylhydrosiloxane) (PMHS) is a non-toxic, enviromentally friendly, inexpensive and easy to handle reductant. However, the inherent low reactivity hampers its applicability in catalytic reactions, such as P(III)/P(V) redox cycling reactions. Most of these
A facile and economical procedure for the synthesis of maleimide derivatives using an acidic ionic liquid as a catalyst
作者:Kai Li、Chao Yuan、Shijun Zheng、Qiang Fang
DOI:10.1016/j.tetlet.2012.06.025
日期:2012.8
in good yields and high purity from the corresponding maleamic acids using a Brønsted acidic room temperature ionic liquid (RTIL) as a catalyst. The products were obtained through merely a decanting and removal of the solvent, suggesting that this procedure is superior to the conventional routes, in which the strong organic/inorganic acids were used as the catalysts, as well as a complicated post-processing
Phase‐Transfer Catalytic Strategy: Rapid Synthesis of Spiro‐Fused Heterocycles, Integrated with Four Pharmacophores‐Succinimide, Pyrrolidine, Oxindole, and Trifluoromethyl Group
作者:Zheng‐Jun Chen、Wei Liang、Zhuo Chen、Lin Chen
DOI:10.1002/ejoc.202001409
日期:2021.2.5
A phase‐transfer catalytic 1,3‐dipolar [3+2] cycloaddition grants rapid generation of various trifluoromethyl spiro‐fused[succinimide‐pyrrolidine‐oxindole]s that might be of great utility for drug discovery. The gram‐scale reaction in conjunction with the derivatizations of the product demonstrate the synthetic potential of this methodology. The reaction mechanism is also discussed.
Enantioselective Michael addition of ketones to maleimides catalyzed by bifunctional monosulfonyl DPEN salt
作者:Feng Yu、Xiaomin Sun、Zhichao Jin、Shigang Wen、Xinmiao Liang、Jinxing Ye
DOI:10.1039/c0cc00774a
日期:——
An unprecedented enantioselective Michaeladdition of various ketones to maleimidescatalyzed by a simple bifunctional primary amine, monosulfonyl DPEN salt, is reported and provides the desired adducts in good to excellent yields (up to 99%) with excellent enantioselectivities (up to 99%).
A highly efficient asymmetric Michael addition of α,α-disubstituted aldehydes to maleimides catalyzed by primary amine thiourea salt
作者:Feng Yu、Zhichao Jin、Huicai Huang、Tingting Ye、Xinmiao Liang、Jinxing Ye
DOI:10.1039/c0ob00154f
日期:——
The first highlyefficientMichaeladdition of challenging α,α-disubstituted aldehydes to maleimides catalyzed by a simple bifunctional primary amine thiourea catalyst/benzoic acid system has been successfully developed to generate quaternary carbon centers in high yields (up to 99%) with excellent enantioselectivities (91–99%).