p-Toluenesulfonic acid monohydrate → HCID 21948669, compound

Participants

Reaction Steps

To a solution of 4-[7-chloro-2-(4-fluorophenyl)-6-(triethoxymethyl)pyrazolo[1,5-α]pyridin-3-yl]-N-cyclopentyl-2-pyrimidinamine (375 mg, 0.677 mmol) in acetone (8 mL) and water (2 mL) was added p-toluenesulfonic acid monohydrate (321 mg, 1.69 mmol). The reaction mixture was stirred at room temperature for 2 hours, then quenched with ice water. The reaction mixture was neutralized with saturated aqueous sodium bicarbonate solution, then concentrated in vacuo to remove the majority of the acetone. The resultant mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, then dried over magnesium sulfate. Filtration and concentration, followed by flash chromatography (29:1 dichloromethane:methanol) provided ethyl 7-chloro-3-[2-(cyclopentylamino)-4-pyrimidinyl]-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridine-6-carboxylate (175 mg, 54%) as a brown solid. Rf 0.08 (29:1 dichloromethane:methanol); 1H NMR (400 MHz, CDCl3) δ 8.36 (d, 1H), 8.09 (d, 1H), 7.82 (d, 1H), 7.65 (m, 2H), 7.14 (t, 2H), 6.30 (d, 1H), 5.19 (d, 1H), 4.46 (q, 2H), 4.32 (m, 1H), 2.06 (m, 2H), 1.77–1.21 (m, 9H); MS m/z 480 (M+1).

Provenance & Evidence