Thionyl Chloride → HCID 10166255, compound

Participants

Reaction Conditions

Reaction Steps

7-(Cyclopentylamino)-3-[2-(cyclopentylamino)-4-pyrimidinyl]-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-6-carboxylic acid dihydrochloride (19 mg, 0.033 mmol) was added to a dry flask and cooled to −78° C. Thionyl chloride (14 μL, 0.19 mmol) was added and the reaction mixture was stirred at room temperature for 30 minutes. The reaction mixture was concentrated under a stream of nitrogen then placed under high vacuum. To a solution of the crude residue in dichloromethane (600 μL) was added pyrrolidine (150 μL, 1.80 mmol). The reaction mixture was stirred at room temperature for 10 minutes then partitioned between ethyl acetate and saturated aqueous sodium bicarbonate solution. The aqueous layer was extracted with ethyl acetate. The combined extracts were washed with water and brine, then dried over magnesium sulfate. Filtration and concentration followed by flash chromatography (1:1 hexanes:ethyl acetate to 100% ethyl acetate) provided N-cyclopentyl-3-[2-(cyclopentylamino)-4-pyrimidinyl]-2-(4-fluorophenyl)-6-(1-pyrrolidinylcarbonyl)pyrazolo[1,5-a]pyridin-7-amine (9 mg, 49%) as a clear oil. Rf 0.13 (1:1 hexanes:ethyl acetate); 1H NMR (300 MHz, CDCl3) δ 8.04 (d, 1H), 7.72 (d, 1H), 7.62 (m, 2H), 7.26 (d, 1H), 7.14(t, 2H), 6.54(d, 1H), 6.30(d, 1H), 5.11 (d, 1H), 4.31 (m, 1H), 4.19 (m, 1H), 3.66 (broad, 2H), 3.38 (broad, 2H), 2.11–1.88 (m, 8H), 1.80–1.50 (m, 12H); MS m/z 554 (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