Lawesson's reagent → 2-Amino-6-(2,6-dichlorophenyl)-8-methyl-pyrido[2,3-d]-pyrimidin-7(8H)-thion

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Reaction Steps

A mixture of 0.321 g (1.0 mmol) of 2-amino-6-(2,6-dichlorophenyl)-8-methyl-pyrido[2,3-d]pyrimidin-7-(8H)-one from Example 12 and 0.404 g (1.0 mmol) of Lawesson's Reagent in 10 mL of pyridine was heated at reflux with stirring for 24 hours. The solvent was evaporated under reduced pressure, and the residue was triturated with 20 mL of water, filtered, and the cake washed well with water. Purification was by silica gel chromatography to afford the desired compound identified as 2-amino-6-(2,6-dichlorophenyl)-8-methyl-pyrido[2,3-d]-pyrimidin-7(8H)-thione.

Provenance & Evidence