Triphenylphosphine Oxide → morpholin-4-yl-[3-(1H-pyrazolo[3,4-b]pyridin-5-yl)-phenyl]-methanone

Participants

Reaction Steps

A mixture of 5-bromo-1H-pyrazolo[3,4-b]pyridine (1.50 g, 7.57 mmol), 3-(morpholin-4-carbonyl)phenylboronic acid (2.136 g, 9.09 mmol) and tetrakis(triphenylphosphine)palladium(0) (435 mL, 0.376 mmol) in dimethoxyethane (8 mL) and saturated aqueous solution of sodium bicarbonate (8 mL) was irradiated in a Personal Chemistry Optimizer at 175° C. for 60 min. The crude reaction mixture was distributed between dichloromethane and a saturated aqueous solution of sodium bicarbonate. The aqueous phase was then extracted with dichloromethane, and then ethyl acetate and the combined organic phases were dried over sodium sulfate, filtered and concentrated to afford a pale green foam containing 80% of morpholin-4-yl-[3-(1H-pyrazolo[3,4-b]pyridin-5-yl)-phenyl]-methanone (2.30 g, 80% yield) and 20% of triphenylphosphine oxide. 1H-NMR (500 MHz, d6-DMSO) δ13.75 (s, 1H), 8.87 (d, 1H), 8.54 (d, 1H), 8.21 (d, 1H), 7.85 (m, 1H), 7.77 (m, 1H), 7.58 (t, 1H), 7.41 (m, 1H).

Provenance & Evidence