反应详情

温度

20 °C

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.

1. customdoes not exceed 5° C
2. additionAfter the addition
3. additionis added
4. extractionextracted with ethyl acetate
5. customThe organic phase is dried
6. customthe crude product is purified by normal phase chromatography (cyclohexane/ethyl acetate 90:10→50:50 in 45 min; flow 200 mL/min)