N-phenyl-(1,2-dimethylpropylidene)amine;Anil d. Methyl-isopropyl-keton;N-2(3-Methylbutyliden)anilin;(1,2-dimethyl-propyliden)-aniline;(1,2-Dimethyl-propyliden)-anilin;2-Methyl-butanon-(3)-phenylimin;Benzenamine, N-(1,2-dimethylpropylidene)-;3-methyl-N-phenylbutan-2-imine
Evolution of chiral Lewis basic N-formamide as highly effective organocatalyst for asymmetric reduction of both ketones and ketimines with an unprecedented substrate scope
作者:Li Zhou、Zhouyu Wang、Siyu Wei、Jian Sun
DOI:10.1039/b703307a
日期:——
L-Pipecolinic acid derived Lewis basic N-formamide has been developed as a first highly effective catalyst for the asymmetric reduction of aromatic and aliphatic ketones as well as aromatic and aliphatic ketimines in good to high enantioselectivity.
Asymmetricreduction of imines were studied using dialkoxyborane 1. Dihydro-β-carboline 5a showed moderate (42%ee) and N-phenylketimine 10 higher enantioselectivity (73%ee). Asymmetricreduction of ketones with oxazaborolidine 33 showed high ennatioselectivities.
Rationally-Designed<i>S-</i>Chiral Bissulfinamides as Highly Enantioselective Organocatalysts for Reduction of Ketimines
作者:Dong Pei、Yu Zhang、Siyu Wei、Meng Wang、Jian Sun
DOI:10.1002/adsc.200700504
日期:2008.3.7
example of S-chiral organocatalysts, that are highly efficient and enantioselective in substoichometric amounts, and which use a chiral monosulfinamide group as Lewis base to activate trichlorosilane (HSiCl3) to reduce N-arylketimines. A plausible mechanism involving two molecules of the monosulfinamde catalyst for the activation of HSiCl3 prompted us to design S-chiral bissulfinamides as new catalysts
l-Pipecolinic acid derived Lewis base organocatalyst for asymmetric reduction of N-aryl imines by trichlorosilane: effects of the side amide group on catalytic performances
作者:Zhouyu Wang、Chao Wang、Li Zhou、Jian Sun
DOI:10.1039/c2ob26772a
日期:——
A series of N-formamides derived from pipecolinic acid have been synthesized and tested as Lewisbase catalysts for the enantioselective reduction of N-aryl imines by trichlorosilane. Through the investigation of the structure–efficacy relationship between the side amide group and catalytic performance, several highly effective catalysts were discovered. In particular, arylamido-type catalyst 5i and
A Highly Enantioselective Lewis Basic Organocatalyst for Reduction of <i>N</i>-Aryl Imines with Unprecedented Substrate Spectrum
作者:Zhouyu Wang、Xiaoxia Ye、Siyu Wei、Pengcheng Wu、Anjiang Zhang、Jian Sun
DOI:10.1021/ol060112g
日期:2006.3.2
L-Pipecolinic acid derived formamides have been developed as highly efficient and enantioselective Lewis basic organocatalysts for the reduction of N-aryl imines with trichlorosilane. Catalyst 4b afforded high isolated yields (up to 98%) and enantioselectivities (up to 96%) under mild conditions with an unprecedented substrate spectrum.