Dimethylformamide → Methyl 3-fluoro-4-(3-methoxyprop-1-ynyl)benzoate

Participants

Reaction Conditions

Reaction Steps

To methyl 4-bromo-3-fluoro-benzoate (2.50 g, 10.7 mmol), copper (I) iodide (204 mg, 1.07 mmol) and Pd(PPh3)2Cl2 (753 mg, 1.07 mmol) in a flask under Argon was added DMF (degassed for 30 min) and reaction cooled to 0 C. Et3N (1.95 mL, 14.0 mmol) was added followed by 3-methoxyprop-1-yne (997 μL, 11.8 mmol) and the mixture was allowed to stir at 60° C. for 70 min. The mixture was cooled, diluted with ethyl acetate and filtered. The filtrate was washed sequentially with 1 M HCl, 10% NH4OH and brine solutions. The organic layer was separated, dried and purified with silica gel using ethyl acetate-hexanes to give methyl 3-fluoro-4-(3-methoxyprop-1-ynyl)benzoate. ESI-MS m/z calc. 222.2, found 223.2 (M+1)+; Retention time: 1.53 minutes (3 min run). 1H NMR (400 MHz, CDCl3) δ 7.75 (ddd, J=11.2, 8.8, 1.5 Hz, 2H), 7.50 (dd, J=7.9, 7.0 Hz, 1H), 4.37 (s, 2H), 3.92 (s, 3H), 3.47 (s, 3H).

Provenance & Evidence