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

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반응 단계

A mixture of 0.100 g (0.26 mmol) of 6-(2,6-dichlorophenyl)-2-methanesulfonyl-8-methyl-8H-pyrido[2,3-d]pyrimidin-7-one of Example 39 and 0.300 g (3.00 mmol) of cyclohexylamine was heated to the boiling point (134° C.). The resulting solution was heated at reflux for 2 minutes. Most of the excess amine was evaporated at reduced pressure. The remaining gum was dissolved in 2 mL of ethyl acetate hot. Petroleum ether (2 mL) was added, and the crystals that separated from the cooled solution were filtered and washed with water; wt 0.090 g. Recrystallization from ethyl acetate gave pure crystalline product; 0.048 g; mp 242°-244° C.

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