Enantioselective Synthesis of Homoallylic Amines through Reactions of (Pinacolato)allylborons with Aryl-, Heteroaryl-, Alkyl-, or Alkene-Substituted Aldimines Catalyzed by Chiral <i>C</i><sub>1</sub>-Symmetric NHC−Cu Complexes
作者:Erika M. Vieira、Marc L. Snapper、Amir H. Hoveyda
DOI:10.1021/ja200311n
日期:2011.3.16
A catalytic method for enantioselective synthesis of homoallylamides through Cu-catalyzed reactions of stable and easily accessible (pinacolato)allylborons with aryl-, heteroaryl-, alkyl-, or alkenyl-substituted N-phosphinoylimines is disclosed. Transformations are promoted by 1-5 mol % of readily accessible NHC-Cu complexes, derived from C(1)-symmetric imidazolinium salts, which can be prepared in
A Direct Catalytic Asymmetric Mannich-type Reaction via a Dinuclear Zinc Catalyst: Synthesis of Either <i>anti</i>- or <i>s</i><i>yn</i>-α-Hydroxy-<i>β</i>-Amino Ketones
作者:Barry M. Trost、Jaray Jaratjaroonphong、Vichai Reutrakul
DOI:10.1021/ja057498v
日期:2006.3.1
The use of imines bearing a hydrolyzable nitrogen substituent in direct asymmetric Mannich reactions with α-hydroxyketones is developed. Previous work focused on the use of N-arylimines or nonenolizable imines, and the latter with only methoxy-substituted α-hydroxyacetophenones. Using a dinuclearcatalyst devised from 2,6-di-(S)-2‘-diphenylhydroxymethylpyrrolidino-N-methyl)-4-methylphenol and diethylzinc
[EN] SIMPLE ORGANIC MOLECULES AS CATALYSTS FOR PRACTICAL AND EFFICIENT ENANTIOSELECTIVE SYNTHESIS OF AMINES AND ALCOHOLS<br/>[FR] MOLÉCULES ORGANIQUES SIMPLES EN TANT QUE CATALYSEURS POUR LA SYNTHÈSE ÉNANTIOSÉLECTIVE PRATIQUE ET EFFICACE D'AMINES ET D'ALCOOLS
申请人:TRUSTEES BOSTON COLLEGE
公开号:WO2013131043A1
公开(公告)日:2013-09-06
The present invention provides organic molecules and methods thereof for reactions between organoboron reagents and double bonds, such as imines or carbonyls, to stereoselectively provide chiral products including amines and alcohols, entities useful for the preparation of biologically active molecules.
SIMPLE ORGANIC MOLECULES AS CATALYSTS FOR PRACTICAL AND EFFICIENT ENANTIOSELECTIVE SYNTHESIS OF AMINES AND ALCOHOLS
申请人:Trustees of Boston College
公开号:US20150057451A1
公开(公告)日:2015-02-26
The present invention provides organic molecules and methods thereof for reactions between organoboron reagents and double bonds, such as imines or carbonyls, to stereoselectively provide chiral products including amines and alcohols, entities useful for the preparation of biologically active molecules.
Nickel-catalysed addition of dialkylzinc reagents to N-phosphinoyl- and N-sulfonylimines
作者:Raquel Almansa、David Guijarro、Miguel Yus
DOI:10.1016/j.tet.2006.11.056
日期:2007.1
A catalytic amount of a nickel complex (0.1-5.3 mol %) extraordinarily increases the reaction rate of the addition of dialkylzinc reagents to N-(diphenylphosphinoyl)- or N-(benzenesulfonyl)imines. The reaction of imines derived from both aromatic and aliphatic aldehydes with various dialkylzinc reagents in the presence of several nickel complexes gives the expected addition products in most cases in I h and in very good yields. In general, the formation of reduction by-products was not an important side reaction. The process represents a great improvement, with regard to the reaction rate and the yield of the addition products, in comparison with the reactions performed in the absence of the nickel catalyst, and reaction times are much shorter than the ones reported so far using other catalysts. (c) 2006 Elsevier Ltd. All rights reserved.