AbstractIr‐catalyzed transformations initiated by sulfur‐directed vinylic sp2 and benzylic sp3 C−H activation are disclosed that achieve the construction of sulfur‐containing seven‐ and eight‐membered systems. Allyl 2‐alkynylphenyl sulfides were transformed into dihydrobenzothiepines in 30–95 % yield, and 2‐alkynylaryl 2‐tolyl sulfides were converted into dibenzo[b,f]thiepines in 57–95 % yield along with double bond isomerization. In both reactions, the combination of Ir catalyst and sulfide moiety was a key to the facile cyclization.
摘要 本研究揭示了由硫引导的乙烯基 sp2 和苄基 sp3 C-H 活化引发的铱催化转化,从而构建出含硫的七元和八元体系。烯丙基 2-炔基苯基硫化物转化成二氢苯并噻吩的收率为 30-95%,2-炔基芳基 2-甲苯硫化物转化成二苯并[b,f]噻吩的收率为 57-95%,同时还发生了双键异构化反应。在这两个反应中,Ir 催化剂和硫化物分子的结合是实现快速环化的关键。