We have developed an efficient method to synthesize various quinazoline-2,4-diones using poly-(ethylene glycol) as soluble polymeric support. The procedure of this reaction included: formation of acyl azide, efficient Curtius rearrangement, nucleophlic addition with amines to produce ureas, cyclization and concurrent cleavage of the resulted six-membered heterocycle from PEG-support in excellent yields
我们已经开发出一种有效的方法,可以使用聚(
乙二醇)作为可溶性聚合物载体来合成各种
喹唑啉-2,4-二酮。该反应的程序包括:酰基
叠氮化物的形成,有效的库尔修斯重排,与胺的核苷加成以产生
脲,环化并同时以优异的产率从P
EG-载体上裂解所得的六元杂环。该方法温和且易于操作。