Novel Cyclic 1,2-Diacetals Derived from (2R,3R)-(+)-Tartaric Acid: Synthesis and Application as N,O Ligands for the Enantioselective Alkylation of Benzaldehyde by Diethylzinc
作者:M. Teresa Barros、Christopher D. Maycock、Ana Maria Faísca Phillips
DOI:10.1002/ejoc.200300750
日期:2004.4
A chiral cyclic 1,2-diacetal derived from tartaric acid was used as the basic structural unit for novel ligands. Monooxazoline carbinols in which the degree of substitution of the alcohol and the nature of the stereocentre in the oxazoline ring were varied were synthesized in moderate to good yields. The influence of these structural factors on asymmetric induction was examined in the enantioselective
衍生自酒石酸的手性环状 1,2-二缩醛被用作新型配体的基本结构单元。以中等至良好的收率合成了单恶唑啉甲醇,其中醇的取代度和恶唑啉环中立体中心的性质是变化的。在二乙基锌对苯甲醛的对映选择性加成中检查了这些结构因素对不对称诱导的影响。使用仲醇或叔醇作为金属螯合基团时观察到高达 60% ee。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)