Unexpected Aldehyde-Catalyzed Reaction of Imidazole N-Oxides with Ethyl Cyanoacetate
作者:Anton V. Kutasevich、Anna S. Efimova、Marina N. Sizonenko、Valery P. Perevalov、Ludmila G. Kuz’mina、Vitaly S. Mityanov
DOI:10.1055/s-0039-1691527
日期:2020.1
The reaction of 2-unsubstituted imidazole N-oxides with ethyl cyanoacetate and aromatic aldehydes leads to the formation of ethyl 2-cyano-2-(1,3-dihydro-2H-imidazole-2-ylidene)acetates. The reaction proceeds through an initial [3+2] cycloaddition, followed by cleavage of the cycloadduct and regeneration of the aldehyde, which essentially plays a catalytic role.
2-未取代咪唑N-氧化物与氰基乙酸乙酯和芳香醛的反应导致形成2-氰基-2-(1,3-二氢-2H-咪唑-2-亚基)乙酸乙酯。该反应通过最初的 [3+2] 环加成反应进行,然后是环加合物的裂解和醛的再生,这基本上起催化作用。