Substituted ureas based on 2,6-dimethyl-3,5-pyridinedicarboxylic acid azides
作者:E. Yu. Nesterova、A. S. Pugacheva、M. V. Voevudsky
DOI:10.1007/s10593-012-1120-1
日期:2012.11
Under Curtiusrearrangement conditions, 2,6-dimethyl-3,5-pyridinedicarboxylic acid azides form the corresponding isocyanates which react in situ with ammonia, primary and secondary amines to form mono-, di-, and trisubstituted ureas. The reaction of the 5-ethoxycarbonyl-2,6-dimethylnicotinic acid azide with imidazole under these conditions gave symmetrical N,N'-bis[5-(ethoxycarbonyl)-2,6-di-methylpyridin-3-yl]ureas