Chloroform → HCID 10128284, compound

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Reaction Steps

2-[5-(4-tert-Butoxycarbonyl-piperazin-1-yl)-pyridin-2-ylamino]-8-cyclopentyl-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester (0.40 g, 0.709 mmol, prepared as in Example 6) was dissolved in a mixture of chloroform (15 ml) and ethanol (15 ml) and the solution was purged with anhydrous hydrogen chloride gas. After 2 hours, the addition of ethyl acetate precipitated a solid which was filtered, washed with diethyl ether and dried in vacuo to yield 0.4 g of 8-cyclopentyl-7-oxo-2-(5-piperazin-1-yl-pyridin-2-ylamino)-7,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester hydrochloride as a yellow solid. MS (APCI); M++1: Calc'd, 464.53. Found, 464.4. Analyses for C24H29N7O3.0.75 H2O.2.0HCl. Calc'd: C, 52.41; H, 5.96; N, 17.83; Cl (ionic), 12.89; H2O, 2.46. Found: C, 52.25; H, 5.86; N, 17.85; Cl (ionic), 12.10; H2O, 1.52.

Provenance & Evidence