Potassium Phosphate, Tribasic → 4-(2-Chloropyridine-3-yl)-1-(triisopropylsilyl)-1h-pyrrolo[2,3,b]pyridine

Participants

Reaction Steps

4-Chloro-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine (5.03 g, 16.3 mmol, 1 equiv), 2-chloropyridine-3-boronic acid (4.36 g, 27.7 mmol, 1.7 equiv), palladium acetate (183 mg, 0.815 mmol, 5 mol %), 2-(dicyclohexylphosphino)biphenyl (571 mg, 1.63 mmol, 10 mol %), and finely ground anhydrous K3PO4 (10.4 g, 48.9 mmol, 3 equiv) were added into a sealed tube. The tube was purged with argon for 5 minutes. Dioxane (30 mL) was added via syringe under a positive argon flow. The tube was sealed and the reaction was stirred at RT for 5 minutes. Then the tube was placed in a preheated oil bath at 110° C. for 2 h. The reaction was cooled down to room temperature. The content was filtered through a plug of celite with an aid of diethyl ether. The filtrated was concentrated under reduced pressure. The product was purified by column chromatography using a mixture of 95:5 Hex:Et2O as eluent. The product, 4-(2-chloropyridine-3-yl)-1-(triisopropylsilyl)-1H-pyrrolo[2,3,b]pyridine was obtained as a light yellow solid. 1H NMR (Varian, 300 MHz, CDCl3) ppm: 8.35 (d, J=4.7 Hz, 1H), 8.30-8.28 (m, 1H), 8.10-8.03 (m, 1H), 7.40-7.30 (m, 2H), 7.15 (dd, J=4.3, 1.7 Hz, 1H), 6.54 (dd, J=3.6, 1.9 Hz, 1H), 1.89 (sept, J=7.4 Hz, 3H), 1.15 (d, J=7.4 Hz, 18H).

Provenance & Evidence