Comparative study of synthetic approaches to 1-arylmethylenepyrazino[2,1-b]quinazoline-3,6-diones
作者:Pilar Cledera、Carmen Avendaño、J.Carlos Menéndez
DOI:10.1016/s0040-4020(98)00744-3
日期:1998.10
4-dihydro-1H-pyrazino[2,1-b]quinazoline-3,6-diones (2) was studied. Four synthetic methods were compared, namely direct condensation with the product of the reaction between anthranilic acid and thionyl chloride, transformation into monothioiminoethers or monoiminoethers followed by reaction with anthranilic acid derivatives, and monoacylation with o-azidobenzoyl chloride followed by intramolecular aza-Wittig reaction
研究了3-芳基亚甲基哌嗪-2,5-二酮(1)向1-芳基亚甲基-2,4-二氢-1 H-吡嗪并[ 2,1 - b ]喹唑啉-3,6-二酮(2)的转化。比较了四种合成方法,即直接与邻氨基苯甲酸和亚硫酰氯之间的反应产物缩合,转化为单硫亚氨基醚或单亚氨基醚,然后与邻氨基苯甲酸衍生物反应,与邻叠氮基苯甲酰氯单酰化,然后进行分子内aza-Wittig反应。通过后一种方法可获得最佳结果。