A detailed investigation into the one-pot cascade reaction of ethyl 3,9-dimethyl-7-phenyl-6H-dibenzo-[b,d]pyran-6-one-8-carboxylate with phenylhydrazine
作者:Chao-Yue Chen、Yu Qiao、Lei Zhang、Xin Wang、Ting-Hai Yang
DOI:10.1007/s11164-020-04192-x
日期:2020.9
synthesizing cyclohexane-annulated pyrazolones from a cyclohexonedicarboxylate derivative with phenylhydrazine under the catalysis of sulfuric acid in the air, up to five products were finally obtained from the one-pot procedure. Among the obtained five products derived from the reaction, two unexpected products were identified, an interesting cyclohexane-annulated pyrazolone bearing a hydroperoxide group
摘要 在空气中的硫酸催化下,由环己酮二羧酸酯衍生物与苯肼合成环己烷环化的吡唑啉酮时,一锅法最终可得到多达五种产物。在通过该反应得到的五种产物中,通过晶体学分析鉴定了两种出乎意料的产物,一种带有氢过氧化物基团的有趣的环己烷-环化的吡唑啉酮和环己烯-环化的吡唑啉酮。研究了在不同反应条件下的反应优化和产物分布。已经提出了形成五种产物的反应机理,并且提出了两个意想不到的吡唑啉酮来自缩合/酰胺化/过氧化和缩合/酰胺化/脱水的三步级联产物, 图形摘要