Reaction Steps
A round-bottomed flask was charged with 4-(4-chloro-2-methylphenyl)-5-(4-methylnaphthalen-1-yl)thiophene-2-carbonitrile (209 mg, 0.56 mmol), zinc bromide (338 mg, 1.50 mmol) and sodium azide (97.5 mg, 1.50 mmol). After degassed, DMF (3 mL) was added. The reaction mixture was heated to 110° C. and stirred at this temperature until complete. The reaction was cooled to rt, and 30 mL of 0.1 N aqueous HCl was added. The reaction mixture was extracted with ethyl acetate. The organic phase was dried over anhydrous sodium sulphate and then concentrated. The residue was purified by flash chromatography (hexane:EtOAc:AcOH=30:10:1). 196 mg (84%) of product was obtained as a white solid, 1H NMR (DMSO, 500 MHz) δ 8.03 (d, J=8.40 Hz, 1H), 7.88 (s, 1H), 7.80 (d, J=8.05 Hz, 1H), 7.55 (t, J=7.68 Hz, 1H), 7.48 (t, J=7.65 Hz, 1H), 7.45 (d, J=7.19 Hz, 1H), 7.37 (d, J=7.30 Hz, 1H), 7.23 (d, J=1.95 Hz, 1H), 7.09 (d, J=8.25 Hz, 1H), 7.04 (dd, J=8.25 Hz, J2=2.06 Hz, 1H), 2.65 (s, 3H), 2.17 (s, 3H); 13C NMR (DMSO, 125 MHz) δ 172.05, 141.01, 139.65, 138.35, 135.93, 133.73, 132.18, 132.10, 131.64, 131.31, 131.26, 129.80, 129.23, 127.62, 126.45, 126.26, 126.02, 125.53, 125.51, 124.67, 21.08, 19.82.
