C,C- and C,N-linked dimers and 4-arylmethyl derivatives from 4-arylmethylene pyrazol-5-ones and isoxazol-5-ones with 2-arylbenzim idazolines.
作者:Francesco Risitano、Giovanni Grassi、Francesco Caruso、Francesco Foti
DOI:10.1016/0040-4020(95)00970-1
日期:1996.1
2-arylbenzimidazolines (8), generated in situ from o-phenylenediamine (7) and the appropriate arylaldehydes, by reaction with 4-arylmethylene pyrazol-5-ones (1) or isoxazol-5-ones (2) produce the 4-arylmethyl derivatives (3) or (4) and the C,C- (5) or the C,N-linked dimers. The reaction was rationalised on the basis of the role of 2-arylbenzimidazoline as a reducing agent and proceeds by a non-chain
由邻苯二胺(7)和适当的芳醛通过与4-芳基亚甲基吡唑-5-酮(1)或异恶唑-5-酮(2)反应原位生成的2-芳基苯并咪唑啉(8),生成4-芳基甲基衍生物(3)或(4)和C,C-(5)或C,N-连接的二聚体。基于2-芳基苯并咪唑啉作为还原剂的作用使反应合理化,并通过涉及单电子转移的非链自由基过程进行反应。