Diversity-Oriented Synthesis of Substituted Benzo[<i>b</i>]thiophenes and Their Hetero-Fused Analogues through Palladium-Catalyzed Oxidative CH Functionalization/Intramolecular Arylthiolation
作者:Anand Acharya、S. Vijay Kumar、Hiriyakkanavar Ila
DOI:10.1002/chem.201501828
日期:2015.11.16
benzo[b]thiophenes has been developed through palladium‐catalyzed intramolecular oxidative CH functionalization–arylthiolation of enethiolate salts of α‐aryl‐β‐(het)aryl/alkyl‐β‐mercaptoacrylonitriles/acrylates or acrylophenones. The overall strategy involves a one‐pot, two‐step process in which enethiolate salts [generated in situ through base‐mediated condensation of substituted arylacetonitriles, deoxybenzoins
到多取代苯并[一种高效,高产量的路线b ]噻吩已经通过钯催化的分子内氧化性C语言开发 H的enethiolate盐的官能-arylthiolation α -芳基- β(杂)芳基/烷基- β -mercaptoacrylonitriles /丙烯酸酯或丙烯酮。总体策略涉及一站式,两步过程,其中烯硫醇盐[通过取代的芳基乙腈,脱氧苯偶姻或芳基乙酸酯与(杂)芳基(或烷基)二硫代酸酯的碱介导缩合原位生成]进行分子内C反应在乙酸钯(或氯化钯)/乙酸铜催化体系和四丁基溴化铵作为添加剂在N,N-二甲基甲酰胺(DMF)中作为溶剂的作用下,进行H官能化-芳基硫醇化反应。在少数情况下,采用相应的烯硫醇作为底物,在两步法中苯并[ b ]噻吩的收率更高。在一些示例中,Pd(OAc)2(或PdCl 2在氧气存在下,发现催化剂比乙酸铜作为再氧化剂更有效,通过避免形成副产物,以提高的收率提供了苯并噻吩。该方法与