Indium chloride: a versatile Lewis acid catalyst for the synthesis of 3-sulfenylindoles
摘要:
Indium chloride has been used as a versatile Lewis acid catalyst for the synthesis of 3-sulfenylindoles in good yields by the independent reaction of indoles and N-alkylindoles with N-(phenylthio)phthalimide in dimethyl formamide (DMF) at 100 degrees C for about 5-6 h.[GRAPHICS].(a) R = H (b) R = CH3 (c) R= Ph(a) R-1 = H (b)R-1 = CH3 (c) R-1 = CH2-Ph
The direct 3-arylthiolation of indoles with aromatic thiols has been achieved in the presence of Selectfluor™ under mild conditions to produce 3-arylthioindoles in relatively good to excellent yields and with high selectivity. This method is effective even with 2-unsubstituted indoles.
The direct sulfenylation of indoles with aromatic thiols has been accomplished in the presence of 20 mol% of FeCl3 in refluxing acetonitrile to produce 3-arylthioindoles in relatively good to excellent yields and with high selectivity. This method works even with 2-unsubstituted indoles. thiolation - indoles - thiols - 3-arylthioindoles
We describe herein a catalyst-free selective C−H sulfenylation of imidazo[1,2-a]pyridines using sulfonothioates as odorless source of thioarylated reagent in an aqueous medium. The method works for a variety of substitutedimidazo[1,2-a]pyridines with broad functional group tolerance. The methodology has been extends to selective sulfernylation of indoles and imidazothiazoles. The sulfonothioates are
The copper-catalyzed sulfenylation of indoles with aryl iodide and sulfur powder has been investigated both experimentally and theoretically. This protocol provides a direct and facile approach to prepare 3-sulfenylindoles with moderate to excellent yields and good functional-group tolerance. The in-situ IR analysis provided evidence for that NaOAc could promote the synthesis of diphenyl disulfide by
An efficient and clean CuI-catalyzed chalcogenylation of aromatic azaheterocycles with dichalcogenides
作者:Zhen Li、Jianquan Hong、Xigeng Zhou
DOI:10.1016/j.tet.2011.03.067
日期:2011.5
A highly efficient and environmentally friendly method for catalytic chalcogenylation of imidazopyridines, imidazopyrimidines, indoles, and pyrrolo[2,3-b]pyridines with dichalcogenides has been developed by using CuI as catalyst under air. The reactions proceed smoothly to give the desired products in moderate to excellent yields, without the presence of other additive.
通过在空气中使用CuI作为催化剂,开发了一种高效的,环境友好的方法,该方法用于用二硫代甲烷催化咪唑并吡啶,咪唑并嘧啶,吲哚和吡咯并[2,3- b ]吡啶。反应平稳进行,以中等至优异的产率得到所需产物,而没有其他添加剂的存在。