Nitrogen bridgehead compounds, part<b>68</b>. Studies on quinolizine derivatives. Part<b>2</b>. Synthesis of 1,3-disubstituted-4<i>H</i>-quinolizine derivatives
作者:Angéla Schwartz、Zoltán Pál、László Szabó、Kálmán Simon、István Hermecz、Zoltán Mészáros
DOI:10.1002/jhet.5570240320
日期:1987.5
been synthesized using 2-pyri-dineacetic acid derivatives 6a, b, A, B and ethoxymethylenemalonic acid derivatives 7a, b, c in base catalyzed or thermic reaction. In the 6-unsubstituted series, both the 4-oxo and 4-imino derivatives could have been obtained, in the 6-substituted series, however the 4-oxo ones only, whereas instead of the 4-imino derivatives, their monocyclic tautomers 3, 4 have been
在碱催化或热反应中,已经使用2-吡啶二乙酸衍生物6a,b,A,B和乙氧基亚甲基丙二酸衍生物7a,b,c合成了喹喔嗪化合物1和2或其单环互变异构体3和4。在6-未取代的系列中,可以同时获得4-氧代和4-亚氨基衍生物,在6-取代的系列中,仅能获得4-氧代,而不是4-亚氨基的衍生物,而是它们的单环互变异构体3 ,4已被隔离。在6-未取代系列中,最初形成的4-亚氨基化合物已在更强的条件下重排为4-氧代化合物。分离的化合物的结构已通过紫外,红外和1 H nmr光谱证明,3B = C的结构也通过X射线分析证明。