Efficient synthesis of novel dipyridoimidazoles and pyrido[1′,2′;1,2]imidazo[4,5-d]pyridazine derivatives
作者:Jean M Chezal、Emmanuel Moreau、Olivier Chavignon、Claire Lartigue、Yves Blache、Jean C Teulade
DOI:10.1016/s0040-4020(03)00938-4
日期:2003.7
Novel dipyrido[1,2-a;3′,4′-d]imidazoles 7a–d, dipyrido[1,2-a;4′,3′-d]imidazoles 8a,c and pyrido[1′,2′;1,2]imidazo[4,5-d]pyridazine derivatives 9a–d were synthesized by two pathways: thermal electrocyclic reaction of 3-alkenylimidazopyridine-2-oximes 10 and direct condensation of ethyl glycinate (or hydrazine) with 2,3-dicarbonylimidazo[1,2-a]pyridines 11.
新型的二吡啶并[1,2- a ; 3',4'- d ]咪唑7a - d,二吡啶并[1,2- a ; 4',3'- d ]咪唑8a,c和吡啶[1',2' ; 1,2]咪唑并[4,5- d ]哒嗪衍生物9a - d的合成途径有两种:3-烯基咪唑并吡啶-2-肟10的热电环反应以及甘氨酸乙酯(或肼)与2,3的直接缩合。 -二羰基咪唑并[1,2- a ]吡啶11。