A process for manufacturing derivatives of 2-phenyl-4,5-oxazoledione 4-phenylhyrazone is disclosed. The process comprises reacting a derivative of a benezenediazonium salt, a hippuric acid derivative, and acetic anhydride in the presence of a neutralizing agent to effect the cyclization reaction for the formation of the oxazolone ring and the succeeding diazo-coupling reaction. The process does not require the conventional separate, independent step for the preparation of a solution of a hippuric acid derivative and acetic anhydride, thus eliminating the quick heating and quenching procedures and further avoiding the loss of the hippuric acid derivative due to decomposition of the oxazolone derivative. There is thus obtained a high yield of the desired product in a short period of time.
揭示了一种制造2-苯基-4,5-
噁唑二酮4-苯基
肼的衍
生物的工艺。该工艺包括在中性化剂的存在下,使苯二氮盐盐的衍
生物、香豆酰基衍
生物和
乙酸酐发生反应,以实现环化反应形成
噁唑酮环和随后的重氮偶联反应。该工艺不需要传统的独立步骤来制备香豆酰基衍
生物和
乙酸酐的溶液,从而消除了快速加热和淬灭程序,进一步避免了由于
噁唑酮衍
生物分解而导致香豆酰基衍
生物的损失。因此,在短时间内获得了所需产品的高产率。