Facile synthesis of novel 7-aminofuro- and 7-aminothieno[2,3-d]pyridazin-4(5H)-one and 4-aminophthalazin-1(2H)-ones
作者:Gani Koza、Selbi Keskin、Merve Sinem Özer、Betül Cengiz、Ertan Şahin、Metin Balci
DOI:10.1016/j.tet.2012.10.010
日期:2013.1
of the ketoesters with hydrazine provided the hydrazone derivatives. An intramolecular cyclization in the presence of thionyl chloride formed a fused pyridazinone skeleton. Hydrolysis of the remaining ester groups and transformation of the acid functionalities to the acyl azides followed by Curtius rearrangement gave the isocyanates. Reaction of the isocyanates with methanol and water produced urethane
我们在此报告新型化合物的合成,7-氨基呋喃-和7-氨基噻吩并[2,3 - d ]哒嗪-4(5 H)-one和4-氨基酞嗪-1(2 H)-由2-(2-甲氧基-2-氧代乙基)呋喃甲酸甲酯和噻吩-3-羧酸甲酯和2-(2-甲氧基-2-氧代乙基)苯甲酸甲酯开始。直接连接到芳环的酯官能团被区域特异性地转化成酸,而亚甲基被氧化成相应的酮酯。酮酯与肼的反应提供了derivatives衍生物。在亚硫酰氯存在下的分子内环化形成稠合的哒嗪酮骨架。其余酯基的水解和酸官能度向酰基叠氮化物的转化,然后Curtius重排,得到异氰酸酯。异氰酸酯与甲醇和水的反应分别生成氨基甲酸酯和氨基哒嗪酮衍生物。