Industrial preparation method of dexmedetomidine hydrochloride
A technology for dexmedetomidine hydrochloride and dexmedetomidine, which is applied in the field of medicine, can solve problems such as corrosion, rust, toxicity and low yield in workshops and equipment, and achieves avoiding health hazards, reducing process steps, and reducing yield. High rate and purity effect
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[0045] (1) Preparation of medetomidine
[0046] Into a 20L dry glass reactor, add 1.86kg of trimethylsilimidazole and 9.85L of dichloromethane in sequence, stir for 10 minutes, start to add 2.52kg of titanium tetrachloride dropwise, control the internal temperature at 20-30°C, continue stirring after dropping After 30 minutes, continue to add 1.33 kg of 1-(2,3-dimethylbenzene) ethanol dropwise under the temperature adjustment. After the drop is completed, continue to stir and react for 18 hours, and take samples for TLC detection or HPLC detection. After the reaction is completed, add the reaction solution into 10L of ice water, stir for 20min, let stand to separate layers, separate the aqueous phase and the organic phase, discard the organic phase, adjust the pH value of the aqueous phase to 10 with sodium hydroxide, add 12L of dichloromethane for extraction , separated the organic phase, added 4L dichloromethane to the aqueous phase for extraction, and combined the organic p...
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