Unnatural α-amino ethyl esters from diethyl malonate or ethyl β-bromo-α-hydroxyiminocarboxylate
作者:Eloi P Coutant、Vincent Hervin、Glwadys Gagnot、Candice Ford、Racha Baatallah、Yves L Janin
DOI:10.3762/bjoc.14.264
日期:——
We have explored here the scope of the age-old diethyl malonate-based accesses to α-amino esters involving Knoevenagel condensations of diethyl malonate on aldehydes, reductions of the resulting alkylidenemalonates, the preparation of the corresponding α-hydroxyimino esters and their final reduction. This synthetic pathway turned out to be general although some unexpected limitations were encountered
我们在这里探索了基于古老的丙二酸二乙酯对α-氨基酯的接触范围,该方法涉及丙二酸二乙酯在醛上的Knoevenagel缩合反应,所得亚烷基丙二酸酯的还原,相应α-羟基亚氨基酯的制备及其最终还原。尽管遇到了一些意想不到的限制,但这种合成途径被证明是通用的。在进行肟化步骤之前,使用Suzuki-Miyaura偶联或环加成法对某些中间体进行了合成修饰,从而获得了更多的α-氨基酯。此外,探索了其他通往α-羟基亚氨基酯的途径,包括试图改善乙基β-溴-α-羟基亚氨基羧酸酯与各种烷基呋喃化合物之间的环加成反应。