Propargyl alcohol → N-[3-(3-hydroxyprop-1-yn-1-yl)pyrazin-2-yl]-2-(trifluoromethyl)benzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

N-(3-chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide (1.35 g; 4.0 mmol; 1.00 eq.) and 2-propyn-1-ol (336 mg 6.0 mmol; 1.5 eq.) were dissolved in 10 mL of DMF under nitrogen atmosphere. To the reaction mixture was added CH3COOK (588 mg; 6.0 mmol; 1.5 eq.) CuI (40 mg; 0.2 mmol; 0.05 eq.) and Pd(PPh3)2Cl2 (28 mg; 0.04 mmol) under nitrogen. The reaction mixture was then heated at 100° C. under nitrogen for 2 hours. After removal of the solvent by distillation in vacuo, the residue was triturated with water (40 mL) and extracted with diethyl ether (3×30 mL). The organic layer was dried over MgSO4 and evaporated down. The crude product was purified by silica gel column chromatography using a mixture of hexane and AcOEt to give pure N-[3-(3-hydroxyprop-1-yn-1-yl)pyrazin-2-yl]-2-(trifluoromethyl)benzenesulfonamide as a yellowish solid (702 mg, 50% yield, 98% HPLC purity).

Provenance & Evidence