4-Alkylidene-1H-imidazol-5(4H)-one derivatives 4 (aromatic, aliphatic and heteroaromatic) are obtained in good to excellent yields by 1,3-dipolar cycloaddition by using solvent-free conditions under microwave irradiation from imidate 1, aldehydes 2 and dry acetic acid as catalyst. Similar cycloadducts 4 were obtained by cycloaddition from imidate 1 and aldimines 3 as dipolarophiles under microwaves.
在微波辐照下,以
亚胺酯 1、
醛类 2 和干
醋酸为催化剂,在无溶剂条件下通过 1,3-二极环加成法获得了 4-亚烷基-
1H-咪唑-5(4H)-酮衍
生物 4(芳香族、脂肪族和杂芳香族),收率良好至极佳。在微波条件下,以
亚胺酯 1 和醛
亚胺 3 为双极亲和剂,通过环加成反应得到了类似的环加成物 4。