Access to Substituted Thiophenes through Xanthate-Mediated Vinyl C(sp<sup>2</sup>)-Br Bond Cleavage and Heterocyclization of Bromoenynes
作者:Guoling Huang、Jian Li、Jianrong Li、Jiaming Li、Minghua Sun、Peng Zhou、Lu Chen、Yubing Huang、Shaohua Jiang、Yibiao Li
DOI:10.1021/acs.joc.0c01733
日期:2020.10.16
Using inexpensive and safe EtOCS2K as a thiol surrogate and tetrabutylphosphonium bromide and H2O as a mixed solvent, the reaction provided a range of substituted thiophenes in moderate to good yields. In addition, 2,3,4,5-tetrasubstituted thiophenes were able to be prepared under mild reaction conditions by electrophilic heterocyclization with NH4I and EtOCS2K in good yields.
据报道,通过无过渡金属的硫化/环化过程实现溴代炔的化学选择性杂环化的环境可持续策略。使用便宜且安全的EtOCS 2 K作为硫醇替代物,四丁基溴化and和H 2 O作为混合溶剂,该反应可提供中等至良好收率的一系列取代噻吩。此外,能够在温和的反应条件下,通过NH 4 I和EtOCS 2 K的亲电杂环化,以高收率制备出2,3,4,5-四取代的噻吩。