作者:Chang Kiu Lee、Sun Hee Kim、Yong Bun Kim
DOI:10.1002/jhet.5570330403
日期:1996.7
Reactions of benzils and urea in ethylene glycol at 180° for 1-2 hours gave 2,4,5-triaryloxazoles as major products and bicyclic imidazoimidazole-2,5-diones as minor products. N-Methylurea and N-phenylurea gave the oxazoles under similar conditions. The solvent seemed to assist the formation of oxazole by eliminating the isocyanate components as ethylene glycol biscarbamates.
苯甲醚和脲在乙二醇中于180°反应1-2小时,得到的主要产物为2,4,5-三芳基恶唑,次要的产物为双环咪唑并咪唑-2,5-二酮。N-甲基脲和N-苯基脲在类似条件下得到恶唑。该溶剂似乎通过消除异氰酸酯组分(如乙二醇双氨基甲酸酯)来帮助恶唑的形成。