A Ring-Enlargement Reaction Yielding 1,2,5-Benzothiadiazonin-6-one 1,1-Dioxides
作者:Alexander S. Orahovats、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.19920750805
日期:1992.12.16
The structure of this novel type of heterocyclic compounds has been established by X-ray crystallography of 5a (Fig.). A ring expansion via a zwitterionic intermediate of type A' is proposed as the reaction mechanism of the formation of 5.
在室温或在MeCN中回流下,3-氨基-2 H-叠氮基2和3,4-二氢-2 H -1,2-苯并噻嗪-3-酮1,1-二氧化物(4)得到1,2, 5-苯并噻二唑啉酮-6- 1,1-二氧化物5以中等至良好的收率(方案2)。这种新型杂环化合物的结构已通过5a的X射线晶体学确定(图)。提出通过A '型两性离子中间体的扩环作为形成5的反应机理。