Divergent and Regioselective Synthesis of (Trifluoromethyl/carboxyethyl)benzo[4,5]imidazo[1,2‐
<i>a</i>
]pyrimidines from β‐Enamino Diketones
作者:Valquiria P. Andrade、Mateus Mittersteiner、Helio G. Bonacorso、Marcos A. P. Martins、Nilo Zanatta
DOI:10.1002/ejoc.202001142
日期:2020.11.8
β‐Enamino diketones were cyclocondensed with 2‐aminobenzimidazole to selectively furnish 1,2‐ or 1,4‐regioisomers of benzo[4,5]imidazo[1,2‐a]pyrimidines. The selectivity of the reaction was found to be mainly due to the nature of the group (trifluoromethyl or carboxyethyl) attached to the ketone moiety.
将β-烯氨基二酮与2-氨基苯并咪唑进行环缩合反应,以选择性提供苯并[4,5]咪唑并[1,2- a ]嘧啶的1,2-或1,4-区域异构体。发现反应的选择性主要是由于与酮部分相连的基团(三氟甲基或羧乙基)的性质。