Cycloaddition of Pyridinium Methylides with Electron-Deficient Olefins and Silica-Gel Mediated Elimination of Pyridines from the Cycloadducts: A New Method of Alkylation or Hydroalkylidenation of Olefins
作者:Otohiko Tsuge、Shuji Kanemasa、Shigeori Takenaka
DOI:10.1246/bcsj.60.1489
日期:1987.4
react with a variety of olefins carrying two electron-withdrawing groups at the both carbons such as N-substituted maleimides, a citraconimide, dimethyl maleate, dimethyl fumarate, and 1,2-dibenzoylethene. The cycloadducts thus formed undergo a ready elimination of pyridines when treated with silica gel. This sequence is a new method for alkylation or hydroalkylidenation of olefins.
在叶立德碳上带有阴离子稳定取代基的甲基吡啶与在两个碳上带有两个吸电子基团的各种烯烃反应,例如 N 取代的马来酰亚胺、柠康酰亚胺、马来酸二甲酯、富马酸二甲酯和 1,2-二苯甲酰乙烯. 当用硅胶处理时,如此形成的环加合物容易消除吡啶。该序列是烯烃烷基化或加氢烷基化的一种新方法。