catalytic amount of iron(II) triflate, TIPS-protected peroxides bearing primary, secondary, and tertiary C-H sites undergo chemoselective thioetherification of remote C-H bonds with diaryl disulfides. The reaction demonstrates a broad substrate scope and functional group tolerance without the use of any noble metal additives. Mechanistic experiments suggest that the reaction proceeds through 1,5-H atom
One-Pot Synthesis Using the Supported Reagent System Na<sub>2</sub>CO<sub>3</sub>/SiO<sub>2</sub>-PPA/SiO<sub>2</sub>: Synthesis of Benzo[<i>b</i>]thiophenes and Naphthothiophenes
method has been developed for the synthesis of benzo[ B]thiophenes and naphtho[2,1- B]thiophenes from arenethiols and α-halo ketones using Na 2 CO 3 /SiO 2 -PPA/SiO 2 . Reaction of α-halo ketones with arenethiols is promoted by Na 2 CO 3 /SiO 2 to afford α-sulfanyl ketones, which cyclize in the presence of PPA/SiO 2 to give the corresponding thiophene-fused arenes in one-pot. The reaction using α-bromo acetals
开发了一种简单有效的方法,用于使用 Na 2 CO 3 /SiO 2 -PPA/SiO 2 从芳硫醇和α-卤代酮合成苯并[B]噻吩和萘并[2,1-B]噻吩。Na 2 CO 3 /SiO 2 促进α-卤代酮与芳烃硫醇反应生成α-硫烷基酮,在PPA/SiO 2 存在下环化生成相应的噻吩稠合芳烃一锅法。使用α-溴缩醛代替α-卤代酮的反应也通过一锅三步反应得到相应的萘并[2,1-B]噻吩。
A Versatile and Convenient Preparation of Unsymmetrical Diaryl Disulfides
作者:Dariusz Witt、Sebastian Demkowicz、Janusz Rachon
DOI:10.1055/s-2008-1067118
日期:——
of unsymmetrical diaryl disulfides under mild conditions in excellent yields. The described method is based on the straightforward preparation of 5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinane-2-sulfenyl bromide from readily available 5,5-dimethyl-2-sulfanyl-2-thioxo-1,3,2-dioxaphosphorinane or bis(5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl) disulfide. The unsymmetrical diaryl disulfides can