Simple Derivatives of Natural Amino Acids as Chiral Ligands in the Catalytic Asymmetric Addition of Phenylacetylene to Aldehydes
作者:Zhi-jian Han、Rui Wang、Yi-feng Zhou、Lei Liu
DOI:10.1002/ejoc.200400595
日期:2005.3
Optically active propargylic alcohols are important chiral building blocks in asymmetric synthesis, and asymmetric addition of terminal alkynes to aldehydes is one of the most important and interesting procedures by which to prepare these chiral building blocks. In this work we have identified some simple derivatives of (S)-proline and other natural amino acids as chiral ligands that can be combined
旋光炔丙醇是不对称合成中重要的手性结构单元,末端炔烃与醛的不对称加成是制备这些手性结构单元的最重要和最有趣的方法之一。在这项工作中,我们确定了(S)-脯氨酸和其他天然氨基酸的一些简单衍生物作为手性配体,它们可以与 Ti(OiPr)4 结合,然后用于催化乙炔锌的不对称加成,由原位产生苯乙炔与二乙基锌反应生成醛。ee 值高达 90%。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)