A Multistage, One-Pot Procedure Mediated by a Single Catalyst: A New Approach to the Catalytic Asymmetric Synthesis of β-Amino Acids
作者:Ahmed M. Hafez、Travis Dudding、Ty R. Wagerle、Meha H. Shah、Andrew E. Taggi、Thomas Lectka
DOI:10.1021/jo034150e
日期:2003.7.1
A catalytic asymmetric procedure for the preparation of beta-amino acids (specifically beta-substituted aspartic acid derivatives) is reported. The cinchona alkaloid catalyst benzoylquinine (BQ) mediates up to five distinct steps of a reaction pathway, all in one reaction vessel. The products of this reaction, highly optically enriched beta-substituted aspartic acid derivatives, were prepared from
报道了用于制备β-氨基酸(特别是β-取代的天冬氨酸衍生物)的催化不对称方法。金鸡纳生物碱催化剂苯甲酰基奎宁(BQ)最多可在一个反应容器中介导反应路径的五个不同步骤。该反应的产物,高度光学富集的β-取代的天冬氨酸衍生物,是在催化剂存在下由N-酰基-α-氯甘氨酸酯和酰氯制备的。该方法也适用于合成含有β-取代的天冬氨酸单元的小多肽,包括抗生素溶菌素的非天然片段。发现向该系统中添加路易斯酸可加快反应路径中特定步骤的速率。这种反应的机理方面,