446292-08-6Relevant articles and documents
Oxazolidinone derivative and preparation method thereof
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Paragraph 0018-0019, (2020/03/05)
The invention relates to a preparation method of an oxazolidinone compound impurity 5-chloro-nitrogen-[[(5S)-2-oxo-3-[4-acetamidophenyl]-1, 3- oxazolidine-5-yl]methyl] thiophene-2-methanamide (formulaI) in rivaroxaban. According to a preparation method, 4-aminoacetanilide (formula II) and (S)-N-epoxypropyl phthalimide (formula III) are used as raw materials, and the impurity is obtained through ring opening coupling, ring closing, protecting group removal and condensation reaction. The compound represented by formula I can be applied to rivaroxaban bulk drug quality control and qualitative and quantitative research and detection of impurities.
Preparation method of rivaroxaban intermediate
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, (2020/05/02)
The invention provides a preparation method of a rivaroxaban intermediate. The preparation method comprises: (1) carrying out a reaction on a compound A and a compound B in an alcohol or an alcohol aqueous solution to obtain a compound C; and (2) reacting the compound C with N,N'-carbonyldiimidazole in a reaction solvent selected from acetonitrile or butyronitrile to obtain a reaction solution containing a compound D, and performing cooling crystallization to obtain a compound D.
Intermediate for synthesizing rivaroxaban, synthesizing method and application
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Paragraph 0074; 0075; 0076, (2019/01/05)
The invention discloses an intermediate for synthesizing rivaroxaban, a synthesizing method and application. The synthesizing method comprises the following steps: firstly, carrying out addition reaction on a structure of formula II and a structure of formula III to obtain a corresponding amino alcohol compound, and then carrying out cyclization reaction on the amino alcohol compound and a carbonylation reagent to obtain a compound of the structure of formula I; carrying out oxidation reaction on the compound of the structure of formula I and an oxidizing agent to obtain a compound of a structure of known formula IV; secondly, desorbing phthaloyl from the compound of the structure of formula IV according to a known method to obtain a compound of a structure of known formula V; and finally,carrying out acylation reaction on the compound of the structure of formula V to obtain the rivaroxaban (a structure of formula VI). The solvent used in the addition reaction is isopropanol or ethanol, and the addition reaction is carried out at a room temperature or under a heating condition. The intermediate for synthesizing the rivaroxaban, the synthesizing method and the application are designed. The intermediate for synthesizing the rivaroxaban has the advantages of cheap and easily obtained raw materials, gentle and easily operated reaction conditions, environmental protection and lesspollution, high yield and purity, easiness in industrialization and the like.