aldol reactions in water using a catalytic amount of diarylborinic acid have been developed. The reactions proceeded smoothly in the presence of a small amount of an anionic surfactant and a Brønsted acid. Water was the most suitable solvent, and organic solvents such as ether and dichloromethane were ineffective in this system. Use of bis(4-trifluoromethylphenyl)borinic acid gave high catalytic activity
ENANTIOSELECTIVE CROSS ALDOL REACTION VIA DIVALENT TIN ENOLATE
作者:Nobuharu Iwasawa、Teruaki Mukaiyama
DOI:10.1246/cl.1982.1441
日期:1982.9.5
Highly enantioselective cross aldolreaction between aromatic ketones and various aldehydes is achieved via divalent tinenolates employing chiral diamines derived from (S)-proline as ligands.
Chiral copper(II)-catalyzed asymmetric aldolreactions of silyl enol ethers with aldehydes (the Mukaiyama aldolreaction) have been performed in an ethanol-water solution. The use of the protic solvent including water is a key to achieve these reactions. Moreover, a catalytic asymmetric aldolreaction in pure water without using organic solvents has also been successfully carried out. This report has
CHIRAL LEAD CATALYST AND METHOD OF ASYMMETRIC ALDOL REACTION
申请人:Japan Science and Technology Corporation
公开号:EP1203616A1
公开(公告)日:2002-05-08
A novel chiral lead catalyst comprising a lead compound of the following formula:
Pb(ORf)2
(wherein Rf represents a fluorine-containing alkylsulfonyl group)
and a chiral crown ether compound having the structure of the following formula:
which is applicable in a variety of reactions, and enables simple reaction operations with high yield and high optical selectivity, is provided. Also provided is a method of asymmetric synthesis using the same.