作者:Albert Sánchez、Enrique Pedroso、Anna Grandas
DOI:10.1002/ejoc.200901365
日期:2010.5
Activation of the carboxylic acid group of a maleamic acid by treatment with an arenesulfonyl chloride followed by addition of an alcohol affords a fumaramate or a maleamate, depending on the reaction conditions. The E isomer is obtained when the acid is treated with nearly equimolar amounts of 2,4,6-triisopropylbenzenesulfonyl chloride and an alcohol in pyridine. Replacement of pyridine by 2-picoline
根据反应条件,通过用芳烃磺酰氯处理然后加入醇来活化马来酰胺酸的羧酸基团,得到富马酸酯或马来酸酯。当酸用接近等摩尔量的 2,4,6-三异丙基苯磺酰氯和醇在吡啶中处理时获得 E 异构体。用 2-甲基吡啶替代吡啶并使用大量过量的活化剂(均三甲苯磺酰氯)和醇,得到 Z 异构体。在这两种情况下,都实现了高非对映体过量和产率。