Brønsted acid-catalyzed 1,4-addition of 1,3,5-trimethoxybenzene to maleimides and acrylates
作者:Seanghai Hor、Kin-ichi Oyama、Nobuaki Koga、Masaki Tsukamoto
DOI:10.1016/j.tetlet.2021.153100
日期:2021.6
Several Brønsted acids were investigated as catalysts for 1,4-additions of 1,3,5-trimethoxybenzene to maleimides. Among the acids tested, trifluoromethanesulfonic acid in low polar solvents such as toluene and 1,2-dichloroethane was found to show high reactivity, enabling preparation of 3-(2,4,6-trimethoxyphenyl)succinimides. 1,4-Additions of 1,3,5-trimethoxybenzene to acrylates were also realized
研究了几种布朗斯台德酸作为 1,3,5-三甲氧基苯与马来酰亚胺 1,4-加成反应的催化剂。在测试的酸中,发现三氟甲磺酸在甲苯和 1,2-二氯乙烷等低极性溶剂中表现出高反应性,能够制备 3-(2,4,6-三甲氧基苯基)琥珀酰亚胺。1,3,5-三甲氧基苯向丙烯酸酯的1,4-加成也通过甲苯中催化量的三氟甲磺酸实现。