反应详情

温度

80 °C

1 g (3.2 mmol) of caesium carbonate and 280 mg (1.7 mmol) of 4-chloromethylpyridine hydrochloride are added to a solution of 560 mg (1.4 mmol) of methyl (S)-3-(4-hydroxybenzoylamino)-2-(4-methanesulphonylpiperazin-1-yl)propanoate (prepared as described in example 4-4) diluted in 20 ml of dimethylformamide. The reaction medium is stirred at 80° C. for 24 h. The reaction medium is cooled, hydrolysed and extracted with ethyl acetate. The organic phase is washed once with water and once with a saturated aqueous solution of sodium chloride, dried over magnesium sulphate, filtered and concentrated under vacuum. The crude product is purified by chromatography over silica gel eluted with a 30/70 heptane/ethyl acetate mixture+10% methanol. 430 mg (62%) of methyl (S)-2-(4-methane-sulphonylpiperazin-1-yl)-3-[4-(pyridin-4-ylmethoxy)-benzoylamino]propanoate are obtained in the form of a white solid.

1. temperatureThe reaction medium is cooled
2. extractionhydrolysed and extracted with ethyl acetate
3. washThe organic phase is washed once with water and once with a saturated aqueous solution of sodium chloride
4. dry with materialdried over magnesium sulphate
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customThe crude product is purified by chromatography over silica gel
8. washeluted with a 30/70 heptane/ethyl acetate mixture+10% methanol