Benzimidazole condensed ring systems. 2. New synthesis of substituted 1-oxo-1<i>H</i>,5<i>H</i>-pyrido[1,2-<i>a</i>]benzimidazole-4-carbonitriles and related derivatives
作者:Samia M. Rida、Farid S. G. Soliman、El-Sayed A. M. Badawey、Thomas Kappe
DOI:10.1002/jhet.5570250622
日期:1988.11
The synthesis of some 3-substituted and 2,3-disubstituted-1-oxo-1H,5H-pyrido[1,2-a]benzimidazole-4-carbo-nitriles 5,6 by fusing 1H-benzimidazole-2-acetonitrile 1 with some β-keto esters 2,4 in the presence of ammonium acetate or with ethyl β-aminocrotonate 3 is described. The tricyclic compounds were converted to their N-5 methyl of N-5 ethyl derivatives 8,9. Vilsmeir-Haack formylation of 3-methyl-1-oxo-1H
融合1 H-苯并咪唑-2合成一些3取代和2,3-二取代的1-oxo-1 H,5 H-吡啶并[1,2- a ]苯并咪唑-4-碳腈5,6描述了在乙酸铵存在下具有一些β-酮酯2,4的β-乙腈1或β-氨基巴豆酸乙酯3。将三环化合物转化为N-5乙基衍生物8,9的N-5甲基。3-甲基-1-氧代-1 H,5 H-吡啶并[1,2- a ]-苯并咪唑-4-腈5a的Vilsmeir-Haack甲酰化得到其2-甲酰基衍生物10。用三氯氧磷氯化5和6分别得到1-氯吡啶并[1,2- a ]苯并咪唑-4-甲腈11,12,它们用于制备1-叠氮基,1-氨基,1-哌啶子基和1-甲氧基环系统的导数。化合物11a对金黄色葡萄球菌具有很强的体外活性。在小鼠中筛选出了针对P-388淋巴细胞白血病的四种化合物,但它们没有活性。