Double Methylenecyclopentane Annulation of Succinimides: Easy Access to 3,7-Dioxobicyclo[3.3.0]octane-1,5-dicarboximides
作者:Pelayo Camps、José A. Fernández、Jordi Rull、Santiago Vázquez
DOI:10.1002/ejoc.200900273
日期:2009.6
N-Alkylsuccinimides reacted with excess of LHMDS and 3-chloro-2-(chloromethyl)-1-propene to give in medium yieldsN-alkyl-3,7-dimethylenebicyclo[3.3.0]octane-1,5-dicarboximides, which were ozonized to the corresponding 3,7-dioxobicyclo[3.3.0]octane-1,5-dicarboximides. When these alkylations were carried out by using LDA as the base, cis-N-alkyl-4-methylenecyclopentane-1,2-dicarboximides were mainly obtained
N-烷基琥珀酰亚胺与过量的 LHMDS 和 3-氯-2-(氯甲基)-1-丙烯反应,得到中等产率的 N-烷基-3,7-二亚甲基双环[3.3.0]辛烷-1,5-二甲酰亚胺,它们是臭氧化为相应的 3,7-二氧双环 [3.3.0] 辛烷-1,5-二甲酰亚胺。当使用 LDA 作为碱进行这些烷基化时,尽管使用了过量的碱和烷基化剂,但主要获得了顺式-N-烷基-4-亚甲基环戊烷-1,2-二甲酰亚胺。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)