Facile Synthesis of Multiply Substituted Cyclopentadienes and Conjugated Dienals through Reactions between 1,4-Dilithio-1,3-dienes and Carboxylic Acid Derivatives Including Acyl Chlorides, Anhydrides, and DMF
作者:Chao Wang、Guo-Liang Mao、Zhi-Hui Wang、Zhen-Feng Xi
DOI:10.1002/ejoc.200600504
日期:2007.3
Multiply substituted cyclopentadienes were formed through reactions between phenyl-substituted 1,4-dilithio-1,3-dienes such as 1b and 1c and two molecules of acyl chlorides. The phenyl substituents on the skeletons of the dilithiobutadiene derivatives played an essential role in the reaction pattern. Interestingly, when anhydrides were used, normal alkyl-substituted 1,4-dilithio-1,3-dienes such as
多取代的环戊二烯是通过苯基取代的 1,4-二硫代-1,3-二烯(如 1b 和 1c)与两分子酰氯之间的反应形成的。二锂硫代丁二烯衍生物骨架上的苯基取代基在反应模式中起重要作用。有趣的是,当使用酸酐时,正常的烷基取代的 1,4-二硫代-1,3-二烯如 1a 也可以与苯基取代的 1b 和 1c 类似地反应,以优异的分离产率提供类似类型的多取代环戊二烯。发现当用 1a-c 处理时,酯可以提供产品的混合物。当 1,4-二锂-1,3-二烯用 DMF 处理时,以良好的收率获得了多取代的 2,4-二烯-1,6-二烯和/或 2,5-二氢呋喃衍生物,