Chiral Primary−Tertiary Diamine Catalysts Derived From Natural Amino Acids for <i>syn</i>-Aldol Reactions of Hydroxy Ketones
作者:Jiuyuan Li、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1021/jo802557p
日期:2009.2.20
A series of primary-tertiary diamine catalysts were designed and synthesized from primary natural amino acids. Application of these new chiral catalysts in direct aldol reactions of α-hydroxyketones showed very good catalytic activity (up to 97% yield) and high syn selectivity (up to syn/ anti = 30:1, 99% ee).
从伯天然氨基酸设计合成了一系列伯叔二胺催化剂。这些新的手性催化剂在α-羟基酮的直接醛醇缩合反应中的应用显示出非常好的催化活性(高达97%的收率)和高的合成选择性(高达syn / anti = 30:1,99%ee)。
Enamine-Metal Lewis Acid Bifunctional Catalysis: Application to Direct Asymmetric Aldol Reaction of Ketones
Unprecedented bifunctional enamine–metal Lewisacidcatalysts have been developed. In this bifunctional catalytic system, a tridentateligand tethered with a chiral secondary amine was designed to solve the acid–base self-quenching problem leading to catalyst inactivation. This new bifunctional enamine–metal Lewisacidcatalyst was found to catalyze aldol reactions of ketones efficiently in high yields
Organocatalysis with proline derivatives: improved catalysts for the asymmetric Mannich, nitro-Michael and aldol reactions
作者:Alexander J. A. Cobb、David M. Shaw、Deborah A. Longbottom、Johan B. Gold、Steven V. Ley
DOI:10.1039/b414742a
日期:——
Tetrazole and acylsulfonamide organocatalysts derived from proline have been synthesised and applied to the asymmetric Mannich, nitro-Michael and aldol reactions to give results that are superior to the proline-catalysed counterpart.
Asymmetric Direct Aldol Reaction of Functionalized Ketones Catalyzed by Amine Organocatalysts Based on Bispidine
作者:Jie Liu、Zhigang Yang、Zhen Wang、Fei Wang、Xiaohong Chen、Xiaohua Liu、Xiaoming Feng、Zhishan Su、Changwei Hu
DOI:10.1021/ja800839w
日期:2008.4.1
Organocatalysts containing primary-secondary aminebased on bispidine and amino acid have been designed to catalyze the asymmetric direct aldol reaction of functionalized ketones including alpha-keto phosphonates, alpha-keto esters, as well as alpha,alpha-dialkoxy ketones as aldol reaction acceptors. The corresponding products with chiral tertiary alcohols were obtained in moderate to high yields (up
Cross-Linked-Polymer-Supported<i>N</i>-{2′-[(Arylsulfonyl)amino][1,1′-binaphthalen]-2-yl}prolinamide as Organocatalyst for the Direct Aldol Intermolecular Reaction under Solvent-Free Conditions
procedure with polymer 5b was extended to the aldolreaction under solvent‐free conditions of other ketones, including functionalized ones, and different aromatic aldehydes (Table 3). In some cases, the addition of a small amount of H2O was required to give the best results (up to 95% ee). Under these reaction conditions, the cross‐aldolreaction between aldehydes proceeded in moderate yield and diastereo‐