Aniline → 1-(4-bromo-phenyl)-3-cyclopropyl-6,8-dimethyl-5-phenylamino-1H,8H-pyrido[2,3-d]pyrimidine-2,4,7-trione

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Reaction Conditions

Reaction Steps

To toluene-4-sulfonic acid 1-(4-bromo-phenyl)-3-cyclopropyl-6,8-dimethyl-2,4,7-trioxo-1,2,3,4,7,8-hexahydro-pyrido[2,3-d]pyrimidin-5-yl ester 39 (100 mg) obtained in Step 6 was added aniline 40 (0.64 ml), and the mixture was stirred at 150° C. for 2.5 hrs. After allowing to cool to room temperature, diethyl ether-hexane [1:1 (volume ratio), 30 ml] was added to the reaction mixture, and the crystals were collected by filtration. The obtained crystals were purified by column chromatography (chloroform:acetone=15:1) to give 1-(4-bromo-phenyl)-3-cyclopropyl-6,8-dimethyl-5-phenylamino-1H,8H-pyrido[2,3-d]pyrimidine-2,4,7-trione 41 (81 mg, yield 93%) as pale-yellow crystals.

Provenance & Evidence