61337-89-1Relevant articles and documents
A synthesis method of midanping
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, (2017/12/27)
The invention discloses a method for synthesizing mirtazapine. According to the method, 2-halogenated nicotinonitrile is used as an initial compound, and 2-chloronicotinamide, 2-(4-methyl-2phenyl-1-piperazinyl)nicotinamide, 2-(4-methyl-2phenyl-1-piperazinyl)nicotinic acid, 1-(3-hydroxymethylpyridyl-2-)-4-methyl-2-phenylpiperazine and other intermediate products are sequentially synthesized to prepare the mirtazapine. Against the defects in a current mirtazapine synthesizing method, the process is improved, a new synthesizing route is designed, and a preparation method which is economical and is easy for practical operation is provided to mirtazapine synthesis. The method is suitable for large-scale industrial production.
MANUFACTURING METHOD OF PYRIDINEMETHANOL COMPOUND AND MANUFACTURING METHOD OF MIRTAZAPINE
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, (2017/08/18)
PROBLEM TO BE SOLVED: To provide a method capable of manufacturing a manufacturing intermediate of mirtazapine which is useful as an antidepressant at high yield and manufacturing high purity mirtazapine. SOLUTION: In a method for reacting 2-(4-methyl-2-phenyl-1-piperazinyl)-3-pyridinecarboxylic acid and hydrogenated bis(2-methoxyethoxy)aluminum sodium, manufacturing yield of 2-(4-methyl-2-phenyl-1-piperazinyl)-3-pyridine methanol is improved by washing a reaction mixture with alkali metal halide. Also in the method, by-production amount of dimer impurities during reaction can be suppressed and high quality mirtazapine can be manufactured in a method for reaction 2-(4-methyl-2-phenyl-1-piperazinyl)-3-pyridine methanol and sulfuric acid. SELECTED DRAWING: None COPYRIGHT: (C)2017,JPOandINPIT
MANUFACTURING METHOD OF MIRTAZAPINE
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Paragraph 0048-0049, (2017/06/19)
PROBLEM TO BE SOLVED: To provide a method capable of manufacturing mirtazapine useful as antidepressant at high quality and high manufacturing yield without needs for complicated purification operation. SOLUTION: Mirtazapine with largely suppressed by-production amount of impurities during reaction can be manufactured by reacting with use of sulfuric acid with concentration of 85.0% or more and less than 96.0% in a method for manufacturing mirtazapine by reacting 2-(4-methyl-2-phenyl)-1-piperazinyl)-3-pyridinemethanol and sulfuric acid. SELECTED DRAWING: None COPYRIGHT: (C)2017,JPO&INPIT