m-Aminoacetanilide → N-{3-[1-(2-fluoro-4-iodophenyl)-3-(4-methoxybenzyl)-6,8-dimethyl-2,4,7-trioxo-1,2,3,4,7,8-hexahydropyrido[2,3-d]pyrimidin-5-ylamino]-phenyl}-acetamide

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To trifluoromethanesulfonic acid 1-(2-fluoro-4-iodophenyl)-3-(4-methoxybenzyl)-6,8-dimethyl-2,4,7-trioxo-1,2,3,4,7,8-hexahydropyrido[2,3-d]pyrimidin-5-yl ester 86 (1.10 g) and 3′-aminoacetanilide 57 (285 mg) were added, N,N-dimethylacetamide (2.20 ml) and 2,6-lutidine (221 μl), and the mixture was stirred at 130° C. for 2 hrs. After allowing to return to room temperature, methanol (12.0 ml) was added dropwise with stirring. The precipitated crystals were collected by filtration, washed with methanol and dried to give N-{3-[1-(2-fluoro-4-iodophenyl)-3-(4-methoxybenzyl)-6,8-dimethyl-2,4,7-trioxo-1,2,3,4,7,8-hexahydropyrido[2,3-d]pyrimidin-5-ylamino]-phenyl}-acetamide 87 (1.04 g, yield 94.6%) as colorless crystals.

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