Reaction of 2-substituted-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde oximes with electron-deficient olefins and acetylenes
作者:Masashi Shirai、Hidekazu Kuwabara、Satoshi Matsumoto、Hidetoshi Yamamoto、Akikazu Kakehi、Michihiko Noguchi
DOI:10.1016/s0040-4020(03)00591-x
日期:2003.6
A facile oxime–nitrone isomerization through the 1,2-hydrogen shift in 4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carbaldehyde oximes is discussed. The resultant NH-nitrones are trapped by maleimides to afford intermolecular cycloadducts. The reaction of the oximes with electron-deficient acetylenes undergoes via another path initiated by a nucleophilic attack of the oxime to acetylene moiety.
讨论了一种通过4-氧代-4 H-
吡啶并[1,2 - a ]
嘧啶-3-
甲醛肟的1,2-氢转移反应实现的
肟-硝酮的异构化反应。所得的NH-硝酮被马来
酰亚胺捕获,以提供分子间的环加合物。
肟与缺电子
乙炔的反应通过另一种途径进行,该途径由
肟对
乙炔部分的亲核攻击而引发。