Synthesis of Cyclopentenones through Rhodium-Catalyzed C–H Annulation of Acrylic Acids with Formaldehyde and Malonates
作者:Shuling Yu、Chao Hong、Zhanxiang Liu、Yuhong Zhang
DOI:10.1021/acs.orglett.1c01569
日期:2021.7.2
An efficient rhodium-catalyzed protocol for the synthesis of cyclopentenones based on a three-component reaction of acrylic acids, formaldehyde, and malonates via vinylic C–H activation is reported. Exploratory studies showed that 5-alkylation of as-prepared cyclopentenones could be realized smoothly by the treatment of a variety of alkyl halides with a Na2CO3/MeOH solution. Excess formaldehyde and
报道了一种有效的铑催化合成环戊烯酮的方案,该方案基于丙烯酸、甲醛和丙二酸酯通过乙烯基 C-H 活化的三组分反应。探索性研究表明,通过用 Na 2 CO 3 /MeOH 溶液处理各种烷基卤化物,可以顺利地实现所制备的环戊烯酮的 5-烷基化。过量的甲醛和丙二酸酯导致多组分反应,通过迈克尔加成得到多取代的环戊烯酮。