作者:E. Yu. Nesterova、A. S. Pugacheva、M. V. Voevudsky
DOI:10.1007/s10593-012-1120-1
日期:2012.11
Under Curtius rearrangement 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
在Curtius重排条件下,2,6-二甲基-3,5-吡啶二羧酸叠氮化物形成相应的异氰酸酯,其与氨,伯胺和仲胺就地反应形成单,二和三取代的脲。在这些条件下, 5-乙氧基羰基-2,6-二甲基烟酰胺叠氮化物与咪唑的反应得到对称的N,N'-双[5-(乙氧基羰基)-2,6-二甲基甲基吡啶-3-基]脲。