Hydrochloric Acid → 6-acetyl-8-cyclopentyl-2-(5-piperazin-1-yl-pyridin-2-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one hydrochloride

Participants

Reaction Steps

Anhydrous HCl gas was bubbled through a solution of 4-[6-(6-acetyl-8-cyclopentyl-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-ylamino)-pyridin-3-yl]-piperazine-1-carboxylic acid tert-butyl ester (398 mg, 0.74 mmol, prepared as in Example 32), in MeOH/CH2Cl2 (10 mL/10 mL) at room temperature for ˜5 min. The reaction mixture was stirred overnight and then solvent was removed under reduced pressure. The remaining solid was triturated with hot ethyl acetate and dried to provide 6-acetyl-8-cyclopentyl-2-(5-piperazin-1-yl-pyridin-2-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one hydrochloride (329 mg, 76%). mp>300° C. Anal. Calc'd for C23H27N7O2.4.25 HCl: C, 46.94; H, 5.35; N, 16.66. Found: C, 46.77; H, 5.33; N, 16.30. M++1: Calc'd: 434.2. Found 434.2.

Provenance & Evidence