Rhodium-Catalyzed Sequential Dehydrogenation/Deoxygenation in One-Pot: Efficient Synthesis of Dibenzothiophene Derivatives from Diaryl Sulfoxides
作者:Qiufeng Huang、Shurong Fu、Shaojia Ke、Hanbing Xiao、Xiaofeng Zhang、Shen Lin
DOI:10.1002/ejoc.201501075
日期:2015.10
A novel strategy for the synthesis of dibenzothiophene derivatives is established through a one-pot intramolecular cross-dehydrogenative-coupling reaction of diaryl sulfoxides followed by deoxygenation with a Rh/Ag catalytic system. The yields obtained were good to excellent (up to 96 %), therefore making the described protocol an attractive option for building dibenzothiophene compounds.
An efficient ring-closure of 2-iodinated diaryl thioethers at the presence of palladium catalyst to form dibenzothiophene is described. After the best condition was set up as Pd-3(dba)(2) as the catalyst, anhydrous Cu(OAc)(2) as additive, PivONa center dot H2O as base, DMF as solvent, a series of dibenzothiophenes could be successfully obtained through this protocol in moderate to excellent yields.