Phenylacetylene → HCID 18972712, compound

Participants

Reaction Steps

To a 100 mL, 3 necked, oven dried round bottomed flask, with a stirring bar, argon inlet, reflux condenser, and a septum was added ethynyl benzene (2.13 g, 20.83 mmol), dry THF (50 mL) and ethyl magnesium bromide (6.94 mL of a 3.0M solution in ether). This mixture was aged 2 h at ambient temperature then a solution of 1-(2-amino-5-chlorophenyl)-2-chloro-2,2-difluoroethanone (1.00 g, 4.17 mmol) in THF (6 mL) was added with a syringe. The resulting orange-red solution was stirred at ambient temperature for 21.5 h. The reaction was quenched by addition of 1N HCl (50 mL) then diluted with EtOAc. The solution was then made basic with concentrated NH4OH and the layers were separated. The organic phase was washed with water and brine. Drying (MgSO4), filtration, removal of the solvent in vacuo, and chromatography on silica gel using 20% EtOAc in hexane as eluant gave 1.02 g of (+/-) 2-(2-amino-5-chlorophenyl)-4-phenyl-1-chloro-1,1-difluoro-3-butyn-2-ol as an off white solid. 1H NMR (CDCl3): δ4.42 (br s, 2H), 5.10 (br s, 1H), 6.65 (d, 1H, J=8.5 Hz), 7.15 (dd, 1H, J=2.4, 8.5 Hz), 7.38 (m, 3H), 7.55 (m, 2H), 7.70 (d, J=2.4 Hz).

Provenance & Evidence