Chemistry of the Benzotropone Endoperoxides and Their Conversion into Tropolone Derivatives: Unusual Endoperoxide Rearrangements
作者:Murat Güney、Arif Daştan、Metin Balci
DOI:10.1002/hlca.200590061
日期:2005.4
The chemistry of two bicyclic endoperoxides, obtained by photooxygenation of 2,3-benzotropone (=5H-benzocyclohepten-5-one; 5) and of its ethyl carboxylate derivative 15, was investigated with the aim of synthesizing the respective benzotropolone derivatives. The reaction of the endoperoxide 10 derived from 5 with thiourea gave the desired benzotropolone, i.e., 6-hydroxy-5H-benzocyclohepten-5-one (11)
为了合成相应的苯并酮类酮衍生物,研究了通过对2,3-苯甲酮(= 5 H-苯并环庚烯-5-酮;5)及其羧化乙酯衍生物15进行光氧化而获得的两个双环内过氧化物的化学性质。衍生自5的内过氧化物10与硫脲的反应以高收率(方案1)得到所需的苯并tro酮,即6-羟基-5 H-苯并环庚烯-5-酮(11)。另一方面,衍生自羧酸乙酯衍生物15的内过氧化物16进行了空前的转化,除预期的取代苯并恶臭酮衍生物27(方案5)外,主要产生了环收缩的内酯28和29。但是,相同的过氧化物16的热分解反应导致形成四个具有不同骨架的重排化合物(方案3)。讨论了所有产品的形成机理(方案4和6)。