The present invention provides a process for preparing a quinazolone which comprises the steps of (a) dehydrating a N-acyl beta amino acid in the presence of a dehydration agent and an organic solvent for a sufficient period of time and under suitable temperature and pressure conditions to form an oxazone (b) adding a carboxylic acid and a primary amine salt of a carboxylic acid to said oxazone to form a mixture, (c) distilling azeotropically said mixture for a suitable period of time and under suitable temperature and pressure conditions to substantially remove said dehydration agent and said organic solvent, and (d) heating the product of step (c) for a sufficient period of time and under suitable temperature and pressure conditions to form said quinazolone.
本发明提供了一种制备
喹唑酮的方法,包括以下步骤:(a)在脱
水剂和有机溶剂的存在下,在适当的温度和压力条件下,足够的时间内脱
水N-酰基β-
氨基酸,形成氧杂环酮(b)将
羧酸和
羧酸的一级胺盐加入到所述氧杂环酮中形成混合物,(c)在适当的温度和压力条件下,用共沸的方式蒸馏所述混合物足够的时间,从而实质性地去除所述脱
水剂和所述有机溶剂,(d)在适当的温度和压力条件下加热步骤(c)的产物足够的时间,形成所述
喹唑酮。