Sodium Carbonate → 1-benzenesulfonyl-2-(3-methyl-1-m-tolyl-but-1-enyl)-1H-pyrrolo[2,3-b]pyridine

Participants

Reaction Conditions

Reaction Steps

A suspension of toluene-4-sulfonic acid-1-(1-benzenesulfonyl-1H-pyrrolo[2,3-b]pyridin-2-yl)-3-methyl-but-1-enyl ester (3.0 g, 6.04 mmol), m-tolylboronic acid (2.05 g, 15.1 mmol), bis(triphenylphosphine)palladium(II) dichloride (0.5 g, 0.71 mmol) in dioxane (30 mL) and an aqueous sodium carbonate solution (2N, 15 mL) was heated in a microwave at ˜90° C. for 2 h. The reaction mixture was cooled to 25° C., diluted with ethyl acetate (300 mL), washed with a saturated aqueous sodium bicarbonate solution and saturated sodium chloride solution. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. Silica gel column chromatography (300-400 mesh, 9% ethyl acetate/petroleum ether) afforded 1-benzenesulfonyl-2-(3-methyl-1-m-tolyl-but-1-enyl)-1H-pyrrolo[2,3-b]pyridine (2.99 g, crude) as a white solid, which was used in the next step without further purification: 1H NMR (300 MHz, CDCl3) δ ppm 8.49 (dd, 1H, J1=4.8 Hz, J2=0.9 Hz), 7.89 (dd, 1H, J1=7.8 Hz, J2=1.5 Hz), 7.61 (dd, 2H, J1=8.4 Hz, J2=1.5 Hz), 7.43-7.01 (m, 7H), 6.89 (s, 1H), 6.52 (s, 1H), 6.11 (d, 1H, J=10.2 Hz), 2.73-2.60 (m, 1H), 2.17 (s, 3H), 1.12 (dd, 6H, J1=9.3 Hz, J2=6.6 Hz).

Provenance & Evidence