3-Methyl-4-methoxybenzenamine → 2-aminopyrido[2,3-d]pyrimidin-7(8H)-one 53

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A mixture of 0.113 g (0.29 mmol) of 6-(2,6-dichlorophenyl)-2-methanesulfonyl-8-methyl-8H-pyrido[2,3-d]pyrimidin-7-one of Example 39 and 0.40 g (2.90 mmol) of 3-methyl-4-methoxyaniline was heated, with stirring, in a 165° C. oil bath. The resulting solution was heated for 5 minutes and cooled to room temperature. Ether (1 mL) was added. The crystals that developed were filtered and washed with 2 mL of ether; wt 0.109 g. The solid was purified to remove dark colors by silica gel chromatography, eluting with chloroform and then ethyl acetate. The ethyl acetate eluent was concentrated to 3 mL volume. On cooling, pure crystals of product separated; wt 0.060 g; mp 218°-220° C.

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