Chemoselective Synthesis of<i>N</i>-Substituted α-Amino-α′-chloro Ketones<i>via</i>Chloromethylation of Glycine-Derived Weinreb Amides
作者:Vittorio Pace、Wolfgang Holzer、Guido Verniest、Andrés R. Alcántara、Norbert De Kimpe
DOI:10.1002/adsc.201201043
日期:2013.3.25
Functionalized α‐arylamino‐α′‐chloro ketones are obtained in high yield via a straightforward homologation reaction of Weinreb amides derived from N‐arylglycines using in situ generated chloromethyllithium. The use of the Weinreb amides is essential and allows the chemoselective homologation of N‐aryl‐N‐substituted glycine analogues, a transformation which is not possible using similar glycine esters. The
通过使用原位生成的氯甲基锂通过N-芳基甘氨酸衍生的Weinreb酰胺的直接同系物反应,可以高收率获得功能化的α-芳基氨基-α'-氯酮。Weinreb酰胺的使用是必不可少的,它可以实现N-芳基-N-取代的甘氨酸类似物的化学选择性同源性,而使用类似的甘氨酸酯则无法实现这种转化。该方法有望大规模制备α-氨基-α'-氯丙烷,α-氨基-α'-氯丙烷是多种生物活性化合物的宝贵前体。