Azinothricin synthetic studies. 1. Efficient asymmetric synthesis of (3R)- and (3S)-piperazic acids
作者:Karl J. Hale、Vern M. Delisser、Soraya Manaviazar
DOI:10.1016/s0040-4039(00)60838-9
日期:——
A convenient asymmetric synthesis of both (3R)- and (3S)-piperazic acids has been developed that is based on electrophilic hydrazination of a chiral bromovaleryl carboximide enolate with di-tert-butyl azodicarboxylate, followed by subsequent intramolecular SN2 displacement of the bromide by the resulting substituted aza anion. The diastereoselectivity of the process is typically greater than 96%.
已经开发了一种方便的不对称合成(3R)-和(3S)-哌嗪酸的方法,该方法基于手性溴丙二酰羧酰亚胺烯醇酸酯与偶氮二叔丁基二羧酸叔丁酯的亲电子酰化作用,随后分子内S N 2置换溴化后得到的取代的氮杂阴离子。该方法的非对映选择性通常大于96%。