Reaction Steps
A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer, reflux condenser and nitrogen inlet was charged with 1,4-dioxane (13 mL), water (3 mL) and sodium carbonate (417 mg, 3.93 mmol). After bubbling nitrogen through the resulting mixture for 15 min, 34 (150 mg, 0.370 mmol), N-(6-Fluoro-2-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-4,5,6,7-tetrahydro benzo[b]thiophene-2-carboxamide. (192 mg, 0.460 mmol and tetrakis(triphenyl phosphine)palladium(0) (75 mg, 0.065 mmol) were added, and the reaction mixture then heated at reflux for 5 h. After this time, the reaction mixture was cooled to room temperature, filtered and the filter cake washed with diethyl ether (10 mL). The resulting solid was dissolved in methylene chloride/methanol (10:1), absorbed onto silica gel and purified by flash chromatography to afford 35 in 41% yield (93 mg) as a yellow solid: mp 179-180° C.; 1H NMR (500 MHz, CDCl3) δ 8.31 (bs, 1H), 7.79 (d, 2H, J=8.5 Hz), 7.39 (m, 3H), 7.33 (m, 1H), 7.22 (s, 1H), 7.04 (t, 1H, J=8.0 Hz), 6.68 (s, 1H), 5.80 (d, 1H, J=3.5 Hz), 3.99 (s, 1H), 3.65 (s, 3H), 3.64 (m, 1H), 3.36 (m, 1H), 3.11 (m, 1H), 2.82 (t, 2H, J=6.0 Hz), 2.66 (t, 2H, J=6.0 Hz), 2.59 (m, 2H), 2.36 (s, 3H), 2.27 (m, 1H), 1.85 (m, 4H), 0.99 (t, 3H, J=7.0 Hz); MS (ESI+) m/z 615.3 (M+H).
