Asymmetric Synthesis of 3,4,6-Trisubstituted 2,5-Diketopiperazines by Using Dynamic Kinetic Resolution of α-Bromo Tertiary Acetamides
作者:Jinho Baek、Seock Yong Kang、Chan Im、Yong Sun Park
DOI:10.1002/ejoc.201301936
日期:2014.5
A new and efficient method for the asymmetric synthesis of 3,4,6-trisubstituted 2,5-diketopiperazines has been developed. The dynamic kinetic resolution of L-amino-acid-derived α-bromo tertiary amides in the nucleophilic substitution reaction with p-anisidine and a subsequent deprotection-cyclization process provides rapid access to diverse cis-2,5-diketopiperazines 5a–5o and proline-containing trans-2
已开发出一种新的有效方法,用于不对称合成 3,4,6-三取代 2,5-二酮哌嗪。L-氨基酸衍生的 α-溴叔酰胺在与对茴香胺的亲核取代反应和随后的脱保护环化过程中的动态动力学拆分提供了快速获得各种顺式 2,5-二酮哌嗪 5a-5o 和脯氨酸的途径- 含有对映异构纯形式的反式-2,5-二酮哌嗪 5p-5t,总产率为 45-67%。