Method for preparing tiotropium bromide
A technology of tiotropium bromide and preparation process, which is applied in the field of preparation of tiotropium bromide, can solve problems such as the content of isomers not meeting requirements, and achieves the effects of reasonable reaction process design, safe reaction process and high purity
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Embodiment 1
[0020] Add 3 kg of scopolamine hydrobromide to a 50-liter three-necked flask, add 15 liters of anhydrous methanol, basify with saturated potassium bicarbonate solution to pH=8-10, and add 1.5 kg of sodium borohydride at 5-20℃ Reduce the reaction for 8-12 hours, adjust the pH to 1-2 with hydrogen chloride, add 15 liters of anhydrous acetone, freeze overnight, add ether to the filter cake, basify ammonia, filter with suction, and evaporate to dryness under reduced pressure at 15-20°C. 612 grams of viscous B, yield 76%.
[0021] In a 10 liter three-necked flask, add 5 liters of xylene to dissolve 612 grams of scopolamine and 1012 grams of methyl 2,2-dithienyl glycolate. Add 20 grams of sodium and 60 grams of sodium methoxide at 50-60°C. Transesterification reaction occurs, the reaction temperature is controlled at 50℃, and the reaction is 2-3 hours. After the reaction, add dilute hydrochloric acid solution to adjust pH=1-3, add 10 liters of cold distilled water for washing, and adju...
Embodiment 2
[0025] Preparation of scopolitol and methyl 2,2-dithienyl glycolate The method of preparing scopolitol and methyl 2,2-dithienyl glycolate in patent 201010045804.5 was used to prepare scopolitol and 2,2-dithienyl ethanol. Methyl acid.
[0026] The preparation steps of scopolamine 2-(2-thienyl) glycolate are the same as in Example 1, except that the molar ratio of scopolitol to methyl 2,2-dithienyl glycolate is 1:1.5, sodium and The mass ratio of sodium methoxide is 1:5, the amount of catalyst is 4wt% of the total reactants, the total mass of scopolamine, methyl 2,2-dithienyl glycolate and the catalyst (g) and the volume of xylene (ml) ) Ratio is 1:5, the yield of 2-(2-thienyl)glycolate scopolamine is 75%, and the content of 2-(2-thienyl)glycolate scopolamine is 0.07-0.08 %.
[0027] The preparation steps of crude tiotropium bromide are the same as in Example 1, except that the volume ratio of methanol and water is 1:0.5, and the total volume of methanol and water (ml) is the same ...
Embodiment 3
[0030] The preparation method is the same as in Example 1, except that the mass ratio of sodium and sodium methoxide is 1:1, the yield of 2-(2-thienyl)glycolate scopolamine is 80%, and the yield of 2-(2-thienyl) ) The content of scopolamine glycolate isomer is 0.05-0.06%, the volume ratio of methanol to water is 1:1.5, the volume ratio of acetonitrile to methanol is 1:2.5, and the yield of tiotropium bromide is 80%.
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