Aniline → 6-(2,6-dichlorophenyl)-8-methyl-2-(phenylamino)-7H,8H-pyrido[2,3-d]pyrimidin-7-one

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A solution 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 in 1.00 g (10.70 mmol) of aniline was maintained at reflux (184° C.) for 3 minutes. Most of the excess aniline was evaporated at reduced pressure. The remaining gum was dissolved in 1.0 mL of ethyl acetate. Crystals developed on inducement; wt 0.088 g. Further purification to remove dark colors was effected by silica gel chromatography, eluting with chloroform and then 50% hexane-ethyl acetate to obtain pure crystalline product; wt 0.046 g; mp 247°-249° C.

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