The gold rush: A cationic gold(I) complex, supported by a CAAC ligand, promotes the intramolecular addition of NH or NMe bonds (from ammonium salts or tertiary amines, respectively) to carbon–carbon triple bonds; the same complex allows for the isolation of vinylgold intermediates. X=(C6F5)4B. CAAC=cyclic (alkyl)(amino)carbene.
淘金热:由 CAAC 配体支持的阳离子金 (I) 络合物促进 N H 或 N Me 键(分别来自铵盐或叔胺)与碳-碳三键的分子内加成;相同的复合物允许分离乙烯基金中间体。X=(C 6 F 5 ) 4 B.CAAC=环状(烷基)(氨基)卡宾。
Synthesis of 3-((trifluoromethyl)thio)indoles via a reaction of 2-alkynylaniline with trifluoromethanesulfanylamide
作者:Jie Sheng、Shaoyu Li、Jie Wu
DOI:10.1039/c3cc45958f
日期:——
3-((Trifluoromethyl)thio)indoles can be synthesized by a palladium(II)-catalyzed reaction of 2-alkynylaniline with trifluoromethanesulfanylamide in the presence of bismuth(III) chloride. The presence of bismuth(III) chloride is crucial for the success of this transformation, which activates the trifluoromethanesulfanylamide during the reaction.
A palladium‐catalyzedreaction of 2‐alkynylaniline, isocyanides, and silver acetate is described, leading to 3‐amidylindoles in moderate to good yields. During the process, five new bonds are formed with high reaction efficiency in one‐pot procedure.
A palladium-catalyzed tandem cyclization/C-H functionalization of two alkynes was accomplished to construct a series of polycyclic functionalized indoles. A range of internal alkynes bearing synthetically useful functional groups were tolerated. A good regioselectivity was observed when alkyl-substituted alkynes were introduced into the reaction system, and a single product was obtained. Molecular oxygen was used as the terminal oxidant in the approach, rendering the reaction more sustainable.
CuBr-Promoted Tandem Cyclization/Trifluoromethylation of 2-Alkynylanilines: Efficient Synthesis of 3-Trifluoromethylindoles
A new efficient strategy for the synthesis of 3‐trifluoromethyl‐indoles was developed through tandemcyclization/trifluoromethylation of 2‐alkynylanilines and Umemoto's reagent under effect of CuBr. The reaction features the use of cheap copper salt, mild reaction conditions and high yield of products. The preliminary mechanism study indicates the solvent dimethylacetamide acts as the role of dealkylation