Cycloadditions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate: formation of [2.2.3]cyclazines and 1 : 2 adducts
作者:Kiyoshi Matsumoto、Takane Uchida、Hiroshi Yoshida、Mitsuo Toda、Akikazu Kakehi
DOI:10.1039/p19920002437
日期:——
Reactions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate (DMAD), in the presence of Pd–C, gave the corresponding [2.2.3]cyclazines in low to moderate yields, whereas, in the absence of Pd–C, the same reactions afforded the 1 : 2 molar products. The X-ray analysis of one of the 1 : 2 adducts established that the structure was dimethyl 2-cyano-3-styrylpyrrole-1,4-dicarboxylate. A
在Pd–C存在下,吲哚嗪3腈与乙酰二羧酸二甲酯(DMAD)的反应以低至中等的产率得到了相应的[2.2.3]环嗪,而在没有Pd–C的情况下,相同的反应得到1∶2摩尔产物。1∶2加合物之一的X射线分析确定该结构为2-氰基-3-苯乙烯基吡咯烷-1,4-二羧酸二甲酯。提出了一种可能的机制。