Water → HCID 11235766, compound

Participants

Reaction Steps

3-[3-(4-Methoxy-phenyl)-2-oxo-7-phenylamino-3,4-dihydro-2H-pyrimido[4,5-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid tert-butyl ester (70 mg, 0.13 mmols) (from Example 4a supra) was dissolved at 0° C. in a 50% trifluoroacetic acid in dichloromethane solution (5 mL) that contained water (300 μL). After stirring for 1.5 hours the reaction mixture was partitioned between ethyl acetate and 1 N aqueous sodium hydroxide and the pH of the aqueous layer was adjusted to 12 by adding solid sodium hydroxide. The organic layer was then washed with water, dried over sodium sulfate, filtered and concentrated to the crude product. This material was dissolved in tetrahydrofuran and precipitated with an excess of pentane to give 3-(4-methoxy-phenyl)-7-phenylamino-1-piperidin-3-yl-3,4-dihydro-1H-pyrimido[4,5-d]pyrimidin-2-one as an off-white solid. (Yield 47 mg, 84%).

Provenance & Evidence