Studies with Functionally Substituted Heteroaromatics: The Chemistry of N-Phenylhydrazonylalkylpyridinium Salts and of Phenylhydrazonylalkylbenzoazoles
作者:Mervat Mohammed Abdel-Khalik、Mohammed Hilmy Elnagdi、Samia Michel Agamy
DOI:10.1055/s-2000-6326
日期:——
2-Pyrid-1-yliniumacetonitrile bromide 1a and 2-pyrid-1-ylinium-1-phenylethanone bromide 1b coupled with benzenediazonium chloride to yield the corresponding phenylhydrazones 3a, b. Similarly, compounds 2a-c also coupled with aryldiazonium chloride, yielding the arylhydrazones 10a-b, which were used as precursors for the synthesis of azolypyridazinones 11a, b. Compounds 3a, b were converted into 1,2,4,5-dihydrotetrazines 4a, b on refluxing in acetonitrile in the presence of ammonium acetate. Refluxing 3a in dimethylformamide resulted in the formation of the 3-cyanoindazole 6. Compound 3a was converted to pyrazole 8 on treatment with the enaminone 7, and to hydrazonyl bromide 9 on heating in dioxane/acetonitrile. Compound 12 was synthesized from the reaction of 10b with ethanolic aqueous sodium hydroxide.
2-吡啶-1-基氢氯酸铵乙腈溴化物1a和2-吡啶-1-基-1-苯基乙酮溴化物1b与苯胺二氮盐氯化物反应生成相应的苯基肼酮3a和3b。类似地,化合物2a-c也与芳基二氮盐氯化物结合,生成了芳基肼酮10a和10b,这些化合物用于合成azolypyridazinones 11a和11b。化合物3a和3b在氨基乙酸铵存在下在乙腈中回流转化为1,2,4,5-四氢四嗪4a和4b。在二甲基甲酰胺中回流3a则形成了3-氰基吲唑6。化合物3a在处理与酮胺化合物7后转化为吡唑8,并在二噁烷/乙腈中加热生成肼基溴化物9。化合物12是通过10b与醇性氢氧化钠反应合成的。