Preparation method of capecitabine intermediate suitable for industrial production
A technology of capecitabine and intermediates, applied in the field of pharmaceutical drug synthesis, can solve the problems of increased industrial production cost, polyisopropanol solvent, and low production efficiency, and achieve stable yield, high product purity, and reduced processing cost effect
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[0028] A kind of preparation method that is applicable to the capecitabine intermediate of industrialized production, comprises following preparation steps:
[0029] The first step, feeding reaction: After adding acetonitrile, 5-fluorocytosine, hexamethyldisilazane, and trifluoromethanesulfonic acid into the reaction kettle, heat up to reflux, and maintain stirring until the solids are completely dissolved and then continue to reflux At least 2 hours, then lower the temperature to 20~35°C, add 1,2,3-triacetoxy-5-deoxy-D-ribose, then slowly add trifluoromethanesulfonic acid into the reaction kettle through the feeding tank, heat to 45-55°C, and stir for at least 24 hours. In this synthesis temperature range, it is because, in the case of exceeding 55°C, large impurities will be produced, which will affect the yield, and in the case of lower than 45°C, it will affect the reaction. Speed, and finally control the internal temperature of the reactor not higher than 35 ℃.
[0030] ...
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