Esterification of Maleamic Acids without Double Bond Isomerization
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