Microwaves in organic synthesis: Synthesis of pyridazinones, phthalazinones and pyridopyridazinones from 2-oxo-arylhydrazones under microwave irradiation
作者:Balkis Al-Saleh、Morsy Ahmed El-Apasery、Noha M. Hilmy、Mohamed H. Elnagdi
DOI:10.1002/jhet.5570430622
日期:2006.11
phenylhydrazones 1a-d condensed with ethyl cyanoacetate to yield pyridazinones 2a-d that reacted with sulphur in presence of piperidine to yield the aminothienopyridazineones 3a,b that reacted with electron poor olefins and acetylenes to yield phthalazines 10-12. The condensed aminothiophenes 3a,b reacted with dimethylformamide dimethylacetal to yield amidines 13a,b. Compounds 2a,b condensed with dimethylformamide
苯并azo酮1a-d与氰基乙酸乙酯缩合得到吡啶并酮2a-d,后者在哌啶的存在下与硫反应生成氨基噻吩并哒嗪酮3a,b,后者与弱电子烯烃和乙炔反应生成邻苯二甲腈10-12。缩合的氨基噻吩3a,b与二甲基甲酰胺二甲基缩醛反应,得到am13a ,b。将化合物2a,b与二甲基甲酰胺二甲基缩醛缩合,得到反式烯胺16a,b,其容易环化成吡啶并吡啶并酮17a,b在乙酸存在下用乙酸铵处理。化合物2a-d也与亚苄基丙二腈反应,得到邻苯二氮酮21a-d。通过微波加热和常规加热进行反应。通过微波加热,可以在更短的反应时间内获得更好的产率。