Thiazolidin-4-one formation. Mechanistic and synthetic aspects of the reaction of imines and mercaptoacetic acid under microwave and conventional heating
作者:Adele Bolognese、Gaetano Correale、Michele Manfra、Antonio Lavecchia、Ettore Novellino、Vincenzo Barone
DOI:10.1039/b405400h
日期:——
Microwave irradiation of a mixture of benzylidene-anilines and mercaptoacetic acid in benzene gives 1,3-thiazolidin-4-ones in very high yield (65–90%), whereas the same reaction performed through using the conventional method, at reflux temperature, requires a much longer time and gives a much lower yield (25–69%). This difference seems to be due to some intermediates and by-products formed during the conventional reaction. On the basis of 1H NMR studies, two different mechanisms, acting in benzene and in DMF, respectively, have been hypothesized for the thiazolidin-4-one system formation.
在苯中对苄叉苯胺和巯基乙酸的混合物进行微波辐射,可以高产率(65-90%)合成1,3-噻唑烷-4-酮,而采用传统方法在回流温度下进行相同反应,则需要更长的时间并且产率较低(25-69%)。这种差异似乎是由于传统反应过程中产生了一些中间体和副产物。基于1H NMR研究,假设在苯和DMF中分别存在两种不同的机制,促成噻唑烷-4-酮体系的形成。