Activation of Trifluoromethylthio Moiety by Appending Iodonium Ylide under Copper Catalysis for Electrophilic Trifluoromethylation Reaction
作者:Ibrayim Saidalimu、Shugo Suzuki、Etsuko Tokunaga、Norio Shibata
DOI:10.1002/cjoc.201600029
日期:2016.5
A novel iodonium‐ylide compound 2 that appends atrifluoromethylthio (SCF3) group is disclosed as a new, shelf‐stable electrophilic trifluoromethylation reagent. Unlike known shelf‐stable electrophilic trifluoromethylation reagents, 2 has a stable SCF3 group which is activated by appending iodonium ylide under copper catalysis via sulfonium ylide to generate a cationic trifluoromethyl (CF3) species
一种新的碘化亚碘鎓化合物2附加了三氟甲硫基(SCF 3)基团,被认为是一种新的,耐贮存的亲电三氟甲基化试剂。与已知的耐贮存性亲电三氟甲基化试剂不同,2具有稳定的SCF 3基团,该基团是通过在铜催化下经由叶立德sulf合碘鎓叶立德来活化的,从而生成阳离子三氟甲基(CF 3)物种。发现在铜催化下,试剂2是用于多种甲硅烷基烯醇醚3的有效的亲电子三氟甲基化试剂。环状和无环α-三氟甲基酮4通过试剂2以中等至良好的产率获得了产物。另一方面,二氟甲硫基类似物5不影响分子间转移二氟甲基化至底物。取而代之的是,分子内1,4迁移与史蒂文斯重排相似,以21%的收率提供6,而与亲核试剂3无关。