Reactivity of ethanediyl S,S-acetals - 3. Ring aromatization in cyclohexanone derivatives: A novelty synthesis of 1,4-benzodithians
作者:Romualdo Caputo、Carla Ferreri、Giovanni Palumbo、Francesco Russo
DOI:10.1016/s0040-4020(01)86455-3
日期:1991.1
synthetic way leading to 1,4-benzodithians (2) variously substituted at the benzenoid ring. The ready availability of these latter makes the 1,4-benzodithian system itself being regarded as appealing intermediate to obtain, after sulfur replacement or removal, aromatic compounds that cannot be prepared under the usual electrophilic substitution conditions.
据报道,通过简单地同时进行六元环的芳构化和五元含硫环的扩容,环己酮和取代的环己酮的乙二胺S,S-乙缩醛衍生物可以快速,平稳地转化为1,4-苯并二噻吩。在室温下用无水氯仿中的溴处理。这种转化代表了迄今为止报道的第一种合成方法,导致苯环上的1,4-苯并二胺(2)被各种取代。后者的现成可用性使得1,4-苯并二胺体系本身被视为吸引人的中间体,可在硫置换或除去后获得在通常的亲电取代条件下无法制备的芳族化合物。