Sodium Chloride → 8-isopropyl-5-methyl-2-methylsulphanyl-8H-pyrido[2,3-d]pyrimidin-7-one

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Reaction Conditions

Reaction Steps

Sodium hydride (16.75 g, 0.042 mol) is placed in 200 mL dioxane and combined with triethylphosphonoacetate (83.8 mL, 0.419 mmol), so that the temperature does not exceed 5° C. After the addition is complete, the mixture is heated to 20° C. and 1-(4-isopropylamino-2-methylsulphanyl-pyrimidin-5-yl)-ethanone (11.1 g, 0.049 mol) dissolved in 100 mL dioxane is added thereto. The mixture is stirred for 16 h at 90° C., then combined with 10% sodium chloride solution and extracted with ethyl acetate. The organic phase is dried, the solvent is eliminated in vacuo and the crude product is purified by normal phase chromatography (cyclohexane/ethyl acetate 90:10→50:50 in 45 min; flow 200 mL/min) and 8-isopropyl-5-methyl-2-methylsulphanyl-8H-pyrido[2,3-d]pyrimidin-7-one (HPLC-MS: tRet.=1.74 min; MS(M+H)+=250; method FECS1) is obtained.

Provenance & Evidence