Asymmetric conjugate hydrocyanation of α,β-unsaturated carboxylic acid derivatives catalyzed by a Ru[(S)-phgly]2[(S)-binap]–CH3OLi system was examined. The N-acylpyrrole gave the best result in terms of reactivity and enantioselectivity. A series of substrates with alkyl or heterosubstituted alkyl groups at the β-position reacted with a substrate-to-catalyst molar ratio of 200–2000 to afford the β-cyano
Azetidine-derived dinuclear zinc catalyzed asymmetric phospha-Michael addition of dialkyl phosphite to α,β-unsaturated carbonyl compounds
作者:Shanshan Liu、Na Shao、Feng-Zhen Li、Xiao-Chao Yang、Min-Can Wang
DOI:10.1039/c7ob02222k
日期:——
The asymmetric phospha-Michael addition of dialkyl phosphite to α,β-unsaturated carbonyl compounds by using an azetidine-derived dinuclear zinc catalyst was described. The catalyst was proved to be general and efficient for a broad spectrum of enones and α,β-unsaturated N-acylpyrroles. A series of phosphonate-containing compounds were generated with excellent enantioselectivities (up to 99% ee) and
Highly Enantioselective Conjugate Additions of Phosphites to α,β-Unsaturated<i>N</i>-Acylpyrroles and Imines: A Practical Approach to Enantiomerically Enriched Amino Phosphonates
作者:Depeng Zhao、Yuan Wang、Lijuan Mao、Rui Wang
DOI:10.1002/chem.200901901
日期:2009.10.19
The first highlyenantioselective phosphonylation of α,β‐unsaturated N‐acylpyrroles has been developed. Excellent yields (91–99 %) and enantioselectivities (up to >99 % enantiomeric excess (ee)) were observed for a broad spectrum of both phosphites and N‐acylpyrroles under mild conditions. In particular, when diethyl phosphite was employed to test the scope of the N‐acylpyrroles, almost optically pure
interactions of phosphonium salts. Amino acid derived phosphonium salts and dipeptide derived phosphonium salts exhibited different properties for controlling the transition state, which could efficiently promote the Michael addition reaction to give opposite configurations of products with high yields and enantioselectivities. Preliminary investigations on the mechanism of the reaction and applications of
Palladium-catalyzed 1,4-addition of diarylphosphines to α,β-unsaturated N-acylpyrroles
作者:Dan Du、Wei-Liang Duan
DOI:10.1039/c1cc13785a
日期:——
Highly stereoselective asymmetric1,4-addition of diarylphosphines to alpha,beta-unsaturated N-acylpyrroles catalyzed by a PCP pincer-Pd complex has been developed for the synthesis of chiral phosphines with excellent stereoselectivity (91-99% ee) under mild conditions. The products obtained can be further converted into chiral phosphine-oxazoline ligands.