Studies with enamines: Reactivity of<i>N,N</i>-dimethyl-<i>N</i>-[(<i>E</i>)-2-(4-nitrophenyl)-1-ethenyl]amine towards nitrilimine and aromatic diazonium salts
作者:Hamad M. Al-Matar、Sayed M. Riyadh、Mohamed H. Elnagdi
DOI:10.1002/jhet.5570440315
日期:2007.5
In the presence of triethylamine, cycloaddition reaction of enamine 1 with hydrazonoyl halides 2 followed by dimethylamine elimination was achieved, yielding the corresponding 1,3,4-trisubstituted pyrazoles 4. Coupling of enamine 1 with aromatic diazonium salts afforded 2-(arylhydrazono)-2-(4-nitrophenyl)acetaldehyde 9 in good yield. Refluxing the phenyl hydrazone 9a with chloroacetone in ethanol in
在三乙胺的存在下,烯胺1与酰卤2进行环加成反应,然后消除二甲胺,得到相应的1,3,4-三取代的吡唑4。烯胺1与芳族重氮盐的偶联以良好的收率得到2-(芳基肼基)-2-(4-硝基苯基)乙醛9。在三乙胺的存在下,将苯9a与氯丙酮在乙醇中回流,得到经由中间体11a形成的1,3,5-三取代的吡唑12a 。9a的反应在无水乙酸钠存在下,用盐酸羟胺与乙醇反应,得到肟13a,将其在乙酸中在微波炉中辐照,得到15a和16a的混合物。