While some hydrazine derivatives 3 of 2,2-dimethyl-4,4-diphenylbut but-3-enal undergo both the aza-di-π-methane (ADPM) rearrangement and a novel cyclization to afford dihydropyrazole derivatives 5 in varying yields, the tosylhydrazone derivative of 3,3-dimethyl-5,5-diphenylpent-4-en-d-one 7 gives exclusively an excellent yield of the corresponding dihydropyrazole 8, in a reaction that is proposed to involve an electron transfer process.
虽然一些
肼衍
生物 3 的 2,2-二甲基-4,4-二苯基
丁烯-3-醛同时经历氮杂二π-
甲烷(
ADPM)重排和新型环化反应,以不同产率生成
二氢吡唑衍
生物 5,但 3,3-二甲基-5,5-二苯基戊-4-烯-d-酮 7 的对
甲苯磺酰
肼衍
生物仅以极佳的产率生成相应的
二氢吡唑 8,该反应被认为涉及电子转移过程。