Facile Syntheses of Symmetrical Diaryliodonium Salts from Various Arenes, with Sodium Metaperiodate as the Coupling Reagent in Acidic Media¹
作者:Lech Skulski、Lukasz Kraszkiewicz
DOI:10.1055/s-2008-1067169
日期:2008.8
An easy, inexpensive, safe, and effective preparative procedure to obtain symmetrical diaryliodonium bromides (in 17-88% crude yields) from various arenes is presented in this paper. A novel method for the in situ preparation of iodosyl sulfate (Chretien's reagent) is given. Eleven exemplary crude diaryliodonium bromides were readily oxidatively metathesized with 40% aqueous tetrafluoroboric acid and
CuBr was found to be an efficient catalyst for the C–N crosscouplingreaction of purine and diaryliodonium salts. 9-Arylpurines were synthesized in excellent yields with short reaction times (2.5 h). The method represents an alternative to the synthesis of 9-arylpurines viaCu(II) catalyzed C–N couplingreaction with arylboronicacids as arylating agents.
An efficient and general protocol for the synthesis of diarylsulfones via the metal-free coupling of readily available diaryliodonium salts and arenesulfinates in PEG-400 under microwave irradiation has been developed. Utilizing this metal-free and eco-friendly protocol, we have prepared various diarylsulfones in high yields and shorter reaction times under mild conditions. Furthermore, the coupling
Diaryliodonium salts react with carbon monoxide, in the presence of zinc and a catalytic amount of palladium acetate, to give a mixture of the corresponding diarylketones and diaryl-α-diketones under mild conditions.
alkylindium reagents with diaryliodonium salts proceeded efficiently in the presence of tetrakis(triphenylphosphine)palladium [Pd(PPh3)4], 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (SPhos), lithium tert-butoxide, and lithium chloride in DMA/THF (1:1) at 100 °C, leading to the corresponding cross-coupling products in moderate to good yield with broad substrate scope and wide functional group tolerance