Methanol → N-{3-[5-(2-fluoro-4-iodophenylamino)-6,8-dimethyl-2,4,7-trioxo-3,4,6,7-tetrahydro-2H-pyrido[4,3-d]pyrimidin-1-yl]-phenyl}-acetamide

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Reaction Steps

To a suspension of N-{3-[5-(2-fluoro-4-iodophenylamino)-3-(4-methoxybenzyl)-6,8-dimethyl-2,4,7-trioxo-3,4,6,7-tetrahydro-2H-pyrido[4,3-d]pyrimidin-1-yl]-phenyl}-acetamide 88 (960 mg) in anisole (10.0 ml) was added aluminum chloride (1.94 g) with stirring in a water bath. The mixture was stirred at room temperature for 37 hrs, methanol (12.0 ml) was added dropwise, and the mixture was concentrated under reduced pressure. The obtained residue was dissolved in methanol (12.0 ml), and 2N hydrochloric acid (20.0 ml) was added dropwise with stirring in a water bath. The mixture was stirred at room temperature for 1 hr, hexane (10.0 ml) was added, and the mixture was stirred for 1 hr. The precipitated crystals were collected by filtration, washed with hexane, water and methanol, and dried to give N-{3-[5-(2-fluoro-4-iodophenylamino)-6,8-dimethyl-2,4,7-trioxo-3,4,6,7-tetrahydro-2H-pyrido[4,3-d]pyrimidin-1-yl]-phenyl}-acetamide 89 (620 mg, yield 78.1%) as colorless crystals.

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