Reactions of arylchloropyruvic acids esters with aryl- and hetarylhydrazines give rise to pyrazolinedione hydrazones as a result of a tandem condensation of the substituted hydrazines with arylchloropyruvates. In contrast to this process in reaction with hydrazine hydrate a ready reduction unexpectedly occurs by Kizhner-Wolff mechanism affording 3-hydroxydihydrocinnamic acid hydrazide as the principal product. The isomeric arylglycidate reacts along the same pattern.
芳基
氯丙酮酸酯与芳基和
正十八烷基
肼反应生成
吡唑二酮
肼,这是取代的
肼与芳基
氯丙酮酸酯串联缩合的结果。与此不同的是,在与
水合
肼反应的过程中,会意外地通过 Kizhner-Wolff 机理发生还原反应,从而产生作为主要产物的 3-羟基二氢
肉桂酸酰
肼。异构芳基甘
氨酸的反应模式相同。