Sodium Carbonate → 2-(4-Fluorophenyl)thiazole

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of (4-fluorophenyl)boronic acid (10 g, 60.9 mmol) in toluene (70 mL) and ethanol (200 mL) was added 2-bromothiazole (12.7 g, 91.4 mmol) and Na2CO3 (2M, 100 mL, 19.39 g). The reaction mixture was purged with argon for 45 min, Pd(PPh3)4 (3.5 g, 3.04 mmol) added, and the mixture stirred at 95° C. for 5 h. The reaction mixture was cooled to room temperature, quenched with saturated sodium bicarbonate solution (2×100 mL), and extracted with ethyl acetate (2×100 mL). The combined organic layers were washed with ice-cold water (2×100 mL), followed by brine solution (50 mL). The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure to obtain crude product. The crude product was purified by column chromatography (100-200 mesh silica gel; using 10% ethyl acetate in hexane) to obtain 2-(4-fluorophenyl)thiazole as white solid (9.0 g, 82% yield). 1H NMR (400 MHz, DMSO-d6): δ 7.98 (dd, 2H), 7.88 (d, 1H); 7.91 (d, 1H), 7.88 (d, 1H), 7.31 (t, 2H); LC-MS m/z calculated for [M+H]+ 180.02 found 179.91.

Provenance & Evidence