64461-82-1Relevant articles and documents
Preparation method of tizanidine hydrochloride
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, (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 for benzothiadiazole derivative
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Paragraph 0012; 0042; 0044-0045; 0047-0048; 0050-0051; 0053, (2019/04/10)
The invention discloses a preparation method for a benzothiadiazole derivative, and specifically relates to a preparation method for tizanidine hydrochloride. The preparation method includes the following steps: (a) taking a compound II and a compound III or a salt thereof, performing reaction in an organic solvent in the presence of an acid-binding agent, and obtaining an intermediate IV throughalkalization, filtration and refining; and (b) preparing tizanidine hydrochloride shown as a formula I by taking the intermediate IV obtained by step (a) as a raw material. The method is high in yieldand purity, simple in operation, high in production efficiency, environmentally friendly, safe and suitable for industrial mass production, and has wide market application prospects. The preparationsteps are shown in the description.
Preparation method of central alpha 2 adrenergic receptor agonist
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, (2018/03/24)
The invention relates to a preparation method of a central alpha 2 adrenergic receptor agonist. The invention discloses a preparation method of tizanidine hydrochloride, which comprises the followingsteps of: (1) taking organic acid A, a compound S1 as shown in the specification and a compound S2 as shown in the specification as raw materials for reaction in an organic solvent, separating out a solid to form tizanidine organic acid salt S3 as shown in the specification, and (2) preparing tizanidine hydrochloride by taking the tizanidine organic acid salt S3 obtained in step (1) as a raw material, wherein the organic acid A is formic acid, dichloroacetic acid, glycolic acid, maleic acid, fumaric acid, tartaric acid, caproic acid or benzoic acid; R1 is hydrogen, methyl, acetyl, propionyl, benzoyl, tertiary butyl methyl carbonyl or COOR2; and R2 is methyl, ethyl, allyl, benzyl, tertiary butyl or phenyl. The method achieves higher productivity and purity, is easy and simple to operate, high in production efficiency, environment-friendly, safe and applicable to industrial mass production and has broad market application prospects.