- Preparation method of tropisetron hydrochloride
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The invention discloses a preparation method of tropisetron hydrochloride. The Preparation method of the tropisetron hydrochloride is characterized by comprising the following preparation steps: (A) performing substation reaction on 3-indolecarboxylic acid (I) serving as a starting material and thionyl chloride by adding a reaction solvent to prepare 3-indoleformyl chloride (II), and directly performing condensation reaction on the 3-indoleformyl chloride (II) and alpha-tropine (III) under the existence of an acid-binding agent triethylamine to produce tropisetron (IV); and (B) performing acid and alkali salt-forming reaction on the tropisetron (IV) and hydrochloric acid in ethanol to produce the tropisetron hydrochloride (V). Raw materials used in the process reactions are the conventional reagents, are easily available on the market and are low in cost; the conditions are simple and not harsh, the conventional equipment can meet production requirements and are easy to control, and industrialized production can be realized; and dichloromethane and tetrahydrofuran have low boiling point and are easily evaporated to dryness, so energy conservation and safety are achieved.
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Paragraph 0012
(2017/08/29)
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- USE OF ONDANSETRON IN THE MANUFACTURE OF A MEDICAMENT FOR THE TREATMENT OF TREMOR
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The invention provides the use of a 5-HT3 receptor antagonist or a pharmaceutically acceptable derivative thereof for use in the treatment of dyskinesia.
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- Structural analysis of 5-HT3 receptor antagonists: Synthesis and pharmacological activity of various aromatic esters or amides derived from tropane and 1,2,6-trisubstituted piperidine
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Preliminary results of a structure-activity relationship in the field of 5-HT3 receptor antagonists on the influence of the aromatic ring and steric hindrance around the basic nitrogen atom are reported. The favorable role of the naphthalene moiety substituted by a carbonyl function in position 1 was demonstrated by measuring the biological activity using the inhibition of the specific binding of [3H]BRL 43694 and the inhibition of the Bezold-Jarisch reflex. Several esters and amides of 1,2,6-trisubstituted piperidine derivatives with a suitable fit with the antagonist reference compounds were synthesized. The lack of biological activity of these compounds emphasizes the importance of steric hindrance for binding with the anionic receptor site. These data confirm the major role of the tropane and quinuclidine frameworks in the potency of a number of 5-HT3 antagonists.
- Langlois,Soulier,Yang,Bremont,Florac,Rampillon,Giudice
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p. 869 - 880
(2007/10/02)
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