173532-15-5Relevant academic research and scientific papers
Preparation method of tizanidine hydrochloride
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Paragraph 0059-0062, (2021/07/21)
The invention discloses a preparation method of tizanidine hydrochloride, and belongs to the field of medicine preparation. According to the preparation method, 5-chloro-4-amino-2,1,3-benzothiadiazole and 1-acetyl-2-imidazolinone are taken as raw materials, and condensation, alcoholysis and salification are performed, further refining can be performed; then the tizanidine hydrochloride can be prepared. The operation is simpler, more convenient and safer, and the preparation method is more suitable for industrial production. The tizanidine hydrochloride prepared by the method is higher in yield, the obtained tizanidine hydrochloride is also higher in purity; the method has important industrial value, and can protect the supply of the bulk drug tizanidine hydrochloride and benefit the public.
Preparation method of imidazoline derivative
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Paragraph 0049-0119; 0130-0131; 0133-0134; 0137-0138, (2019/12/25)
The invention discloses a preparation method of an imidazoline derivative, and particularly relates to a preparation method of tizanidine hydrochloride. The preparation method of the imidazoline derivative comprises the following steps: A, taking a compound II and a compound III, reacting the compound II and the compound III in an organic solvent in the presence of a dehydrating agent, alkalizingand filtering the reaction product to obtain a compound IV; B, hydrolyzing the compound IV obtained in the step A as a raw material to obtain tizanidine shown by formula V; and C, preparing the tizanidine hydrochloride shown in formula I from the tizanidine obtained in the step B as a raw material. The method has high yield and purity simultaneously, is simple and convenient to operate, high in production efficiency, environmentally friendly and safe, is suitable for industrial mass production, and has wide market application prospect.
