Condensation and Cyclization Reactions of 2-Hydrazinobenzimidazole, -benzoxazole, and -benzothiazole
作者:M. Z. A. Badr、A. M. Mahmoud、S. A. Mahgoub、Z. A. Hozien
DOI:10.1246/bcsj.61.1339
日期:1988.4
2-Hydrazinobenzoxazole (1), -benzimidazole (2), and benzothiazole (3) were condensed with ethyl chloroformate and/or diethyl oxalate to produce, 1,2,4-triazolo- and 1,2,4-triazino-fused ketones of the title azoles respectively. Condensation of 1 and 2 with aromatic aldehydes and/or acetic anhydride produced, 3-aryl- and 3-methyl-substituted 1,2,4-triazolo-fused azoles respectively. The hydrazines 1
2-肼基苯并恶唑 (1)、-苯并咪唑 (2) 和苯并噻唑 (3) 与氯甲酸乙酯和/或草酸二乙酯缩合生成 1,2,4-三唑并和 1,2,4-三嗪酮稠合酮分别为标题唑。1 和 2 与芳香醛和/或乙酸酐缩合,分别产生 3-芳基和 3-甲基取代的 1,2,4-三唑并稠合唑。肼 1 和 2 与乙酰丙酮环化生成相应的 2-(1-吡唑基) 衍生物。2-乙酰噻唑并苯并咪唑与羟胺和/或烷基胺反应生成相应的缩合产物。它也与芳香醛缩合得到查耳酮。与重氮苯盐反应,得到相应的2-芳基偶氮取代化合物。