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.