A New Route to 1-Oxo-1,2-dihydropyrimido[1,6-a]benzimidazole-4-carboxylates from Ethyl 2-(Benzimidazol-2-yl)-3-(dimethylamino)acrylate Using Solvent-Free Conditions
A New Route to 1-Oxo-1,2-dihydropyrimido[1,6-a]benzimidazole-4-carboxylates from Ethyl 2-(Benzimidazol-2-yl)-3-(dimethylamino)acrylate Using Solvent-Free Conditions
A new route to α-hetero β-enamino esters using a mild and convenient solvent-free process assisted by focused microwave irradiation
作者:Zohra Dahmani、Mustapha Rahmouni、Richard Brugidou、Jean Pierre Bazureau、Jack Hamelin
DOI:10.1016/s0040-4039(98)01894-2
日期:1998.11
New alpha-hetero beta-enamino esters 5 (X - NH, O, S) are obtained in good to excellent yields by transamination reactions from ethyl 3-dimethylamino acrylate 2(a-c) and various volatile amines 3(a-e) using solvent-free conditions assisted by focused microwave irradiation. Most of the alpha-hetero beta-enamino ester derivatives 3 present a (E)-s-cis/trans conformation. (C) 1998 Elsevier Science Ltd. All rights reserved.
A New Route to 1-Oxo-1,2-dihydropyrimido[1,6-a]benzimidazole-4-carboxylates from Ethyl 2-(Benzimidazol-2-yl)-3-(dimethylamino)acrylate Using Solvent-Free Conditions