Acetic Acid → HCID 10298014, compound

Participants

Reaction Steps

To a suspension of 3-[2-(cyclopentylamino)-4-pyrimidinyl]-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridin-6-amine dihydrochloride (90 mg, 0.20 mmol) in 1,2-dichloroethane was added cyclopentanone (26 μL, 0.29 mmol), acetic acid (56 μL, 0.98), and sodium triacetoxyborohydride (82 mg, 0.39 mmol). The reaction mixture was stirred at room temperature 16 hours then quenched with water. The resultant mixture was diluted with ethyl acetate and saturated aqueous sodium bicarbonate solution. The organic layer was separated and washed with water and brine. The organic layer was dried over magnesium sulfate. Filtration and concentration followed by flash chromatography (4:1 hexanes:ethyl acetate to 7:3 hexanes:ethyl acetate) provided N-cyclopentyl-3-[2-(cyclopentylamino)-4-pyrimidinyl]-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridin-6-amine (40 mg, 45%) as a green oil. Rf 0.25 (2:1 hexanes:ethyl acetate); 1H NMR (300 MHz, CDCl3) δ 8.25 (d, 1H), 8.00 (d, 1H), 7.79 (s, 1H), 7.61 (m, 2H), 7.13 (t, 2H), 6.86 (d, 1H), 6.32 (d, 1H), 5.23 (br, 1H), 4.36 (m, 1H), 3.72 (m, 1H), 3.54 (d, 1H), 2.14–2.02 (m, 4H), 1.81–1.51 (m, 12H); MS m/z 457 (M+1). To a solution of the product in ether was added 1 M HCl in ether. The precipitated solid was isolated to give the corresponding HCl salt.

Provenance & Evidence