Truly Catalytic and Enantioselective Pinacol Coupling of Aryl Aldehydes Mediated by Chiral Ti(III) Complexes<sup>†</sup>
作者:A. Chatterjee、T. H. Bennur、N. N. Joshi
DOI:10.1021/jo0342875
日期:2003.7.1
A variety of chiral Ti(IV) complexes were reduced in situ with zinc in acetonitrile. The resulting chiral Ti(III) complexes were found to catalyze the pinacol coupling reaction stereoselectively. The best results were obtained from the Ti-SALEN complex, which was found to be an efficient catalyst at 10 mol % concentration. Various aromatic aldehydes were coupled to obtain chiral hydrobenzoin derivatives
Enantioselective Pinacol Coupling of Aryl Aldehydes Catalyzed by Chiral Salan−Mo(IV) Complexes
作者:Hongwei Yang、Hongsong Wang、Chengjian Zhu
DOI:10.1021/jo701842r
日期:2007.12.1
Reported herein is the asymmetricpinacolcoupling of aromatic aldehydes with chiral Salan−Mo(VI) dioxo complex as an effective precatalyst. Chiral diols were obtained with high diastereoselectivity and enantioselectivity up to 92/8 and 95%, respectively. The possible mechanism of the pinacolcoupling reaction with the catalytic system was investigated. The X-ray crystal structure of the precatalyst
A variety of novel hydroxyl-containing tetradentate bisoxazolines were successfully synthesized from natural l-serine and β-DDB. The applications of these ligands in the asymmetricpinacolcoupling of aromatic aldehydes revealed that the absoluteconfigurations of the resulting pinacols were entirely dominated by the axial chirality of the biphenyl component and that the bulky substituent adjacent
Method of producing bicyclo[3.1.0] hexane derivative using enzyme
申请人:Hirotsuka Mitsuaki
公开号:US08618312B2
公开(公告)日:2013-12-31
Production of a bicyclo[3.1.0]hexane derivative, useful as a metabotropic glutamate receptor modulator, becomes possible by a production method that includes converting a compound represented by Formula (II) into a compound represented by Formula (III) by reaction with an acyl group donor in the presence of a microorganism-derived enzyme, without using an expensive optically active trans hydroxy ester as a starting material and without employing a fluorination reaction requiring an ultralow temperature reaction. Furthermore, since asymmetric synthesis can be carried out in a stage closer to the final product, the production method is useful as a production method that can mass produce a bicyclo[3.1.0]hexane derivative.
[EN] PROCESSES FOR PREPARING BICYCLO [3.1.0] HEXANE DERIVATIVES, AND INTERMEDIATES THERETO<br/>[FR] PROCEDES DE PREPARATION DE DERIVES DE BICYCLO [3.1.0] HEXANE ET INTERMEDIAIRES DE CEUX-CI