Alkylation of <i>N</i>′-[(<i>S</i>)-1′-Phenylethyl]-<i>N</i>-(diphenylmethylene)glycinamide using a Phase Transfer Catalyst (PTC) for Practical Asymmetric Syntheses of <i>α</i>-Amino Acid Derivatives
作者:Hyun Ju Kim、Sang-kuk Lee、Yong Sun Park
DOI:10.1055/s-2001-13389
日期:——
The chiral auxiliary mediated stereoselective alkylation reaction of N′-[(S)-1′-phenylethyl]-N-(diphenylmethylene)glycinamide (1) using a phase transfer catalyst (PTC) is described. Alkylation of 1 using 18-crown-6 as a PTC for liquid-solid extraction of KOH in toluene gives best results. This methodology provides a practical protocol for the preparation of a variety of enantio-enriched unnatural α-amino acid derivatives up to 83 : 17 enantiomeric ratio.
本文描述了使用相转移催化剂(PTC)进行N′-[(S)-1′-苯乙基]-N-(二苯甲叉)甘氨酸酰胺(1)的手性辅助介导的立体选择性烷基化反应。在甲苯中使用KOH进行液固萃取时,以18-冠-6作为PTC的1的烷基化反应效果最佳。这一方法为制备多种对映体富集的非天然α-氨基酸衍生物提供了一种实用方案,其对映体比例可达83:17。