The reaction of sydnones with bromine in acetic anhydride revisited: a new route to 5-substituted-3-aryl-1,3,4-oxadiazol-2(3H)-ones from N-aryl-N-bromocarbonylhydrazines
作者:Jonathan Michael Tumey、Thijs Gerritsen、Jimmy Klaasen、Karunakar Reddy Madaram、Kenneth Turnbull
DOI:10.24820/ark.5550190.p010.488
日期:——
The reaction of 3-phenylsydnone with bromine in acetic anhydride to form 5-methyl-3-phenyl-1,3,4-oxadiazol2(3H)-one has been reexamined and improved. A new mechanism involving a bromocarbonylhydrazine species is proposed and its intermediacy is supported by the observation that it reacts with acetic anhydride to yield the corresponding 1,3,4-oxadiazol-2(3H)-one. The process has been expanded to the
3-苯基悉尼酮与溴在乙酸酐中反应生成5-甲基-3-苯基-1,3,4-恶二唑2(3H)-酮的反应得到了重新研究和改进。提出了一种涉及溴羰基肼物种的新机制,其中间体得到了观察结果的支持,即它与乙酸酐反应生成相应的 1,3,4-恶二唑-2(3H)-one。该过程已扩展到酰氯的使用,并开发了 5-取代-3-芳基-1,3,4-恶二唑-2(3H)-酮的新型合成方法。