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Representative Experimental Procedure For Cobalt-catalyzed Three-component Coupling Of Alkynes Dihaloalkanes And Amines. Synthesis Of 4a: CoBr2 (10.9 Mg 10 Mol %) And DBU (152 Mg 1 Mmol) Were Suspended In CH3CN (2 ML) In A 5 ML Schlenk Tube Under Nitrogen. And Then Phenylacetylene (51 Mg 0.5 Mmol) Dichloromethane (126 Mg 1.5 Mmol) And Diethylamine (109.5 Mg 1.5 Mmol) Were Added Via Syringe. The Resulting Solution Was Stirred At 80 -C For 24 H. After Cooling To Room Temperature The Resulting Mixture Was Filtered Through A Short Path Of Silica Gel Eluting With Dichloromethane. The Volatile Compounds Were Removed In Vacuo And The Residue Was Purified By Column Chromatography (SiO2 Hexaneethyl Acetate = 10:1) To Give 4a As A Colourless Oil (79.5 Mg 85%).1H NMR (300 MHz CDCl3) D 7.43-7.40 (m, 2H), 7.30-7.25 (m, 3H), 3.68 (s, 2H), 2.68 (q, J = 7.2 Hz, 4H), 1.16 ( t, J = 7.2 Hz, 6H); 13C NMR (75 MHz, CDCl3): d = 131.8, 128.3, 128.0, 123.5, 85.3, 84.5, 476 41.8, 12.9 ppm
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Representative experimental procedure for cobalt-catalyzed three-component coupling of alkynes, dihaloalkanes, and amines. Synthesis of 4a: CoBr2 (10.9 mg, 10 mol %) and DBU (152 mg, 1 mmol) were suspended in CH3CN (2 mL) in a 5 mL schlenk tube under nitrogen. And then phenylacetylene (51 mg, 0.5 mmol), dichloromethane (126 mg, 1.5 mmol), and diethylamine (109.5 mg, 1.5 mmol) were added via syringe. The resulting solution was stirred at 80 -C for 24 h. After cooling to room temperature, the resulting mixture was filtered through a short path of silica gel, eluting with dichloromethane. The volatile compounds were removed in vacuo and the residue was purified by column chromatography (SiO2, hexane/ethyl acetate = 10:1) to give 4a as a colourless oil (79.5 mg, 85%).1H NMR (300 MHz, CDCl3) d 7.437.40 (m, 2H), 7.307.25 (m, 3H), 3.68 (s, 2H), 2.68 (q, J = 7.2 Hz, 4H), 1.16 (t, J = 7.2 Hz, 6H); 13C NMR (75 MHz, CDCl3): d = 131.8, 128.3, 128.0, 123.5, 85.3, 84.5, 47.6, 41.8, 12.9 ppm.
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