The present invention relates to a process for preparing risedronic acid comprising the step of combining a 3-pyridyl acetic acid or a salt thereof, phosphorous acid, and a halophosporous compound selected from PCl
3
, PCl
S
, POCl
3
, PBr
3
, POBr
3
, and PBr
5
in the presence of a diluent that is either a bicyclic aliphatic hydrocarbon or a substituted cyclic aliphatic hydrocarbon or a mixture thereof, in combination with a codiluent, that is orthophosphoric acid
Disclosed herein is an improved, commercially viable and industrially advantageous process for the preparation of risedronic acid or a pharmaceutically acceptable salt thereof, in high yield and purity.
[EN] IMPROVED PROCESS FOR THE PREPARATION OF RISEDRONATE SODIUM HEMIPENTAHYDRATE<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE RISÉDRONATE MONOSODIQUE HÉMIPENTAHYDRATÉ
申请人:FLEMING LAB LTD
公开号:WO2009034580A1
公开(公告)日:2009-03-19
The invention relates to the process of preparation of Risedronic acid and Risedronate sodium hemipentahydrate in the absence of organic solvents. The process comprises, reacting 3-pyridyl acetic acid with phosphorous acid and phosphorus trichloride to give Risedronic acid which is further reacted with sodium hydroxide in water medium to give Risedronate sodium hemipentahydrate.
Novel process for making bisphosphonic acids using diluents other than halogenated hydrocarbons
申请人:——
公开号:US20040043967A1
公开(公告)日:2004-03-04
Provided is a novel method of making bisphosphonic acids, e.g. risedronic acid, including the step of combining a carboxylic acid, phoshorous acid, and a halophosphorous compound in the presence of a diluent that is an aromatic hydrocarbon or a silicone fluid. When the diluent is an aromatic hydrocarbon, a inert support or ortho-phosphoric acid codiluent is advantageously included.
[EN] USE OF CERTAIN DILUENTS FOR MAKING BISPHOSPHONIC ACIDS<br/>[FR] UTILISATION DE CERTAINS DILUANTS POUR L'ELABORATION D'ACIDES BISPHOSPHONIQUES
申请人:TEVA PHARMA
公开号:WO2003097655A1
公开(公告)日:2003-11-27
Provided is a novel method of making bisphosphonic acids, e.g. risedronic acid, including the step of combining a carboxylic acid, phoshorous acid, and a halophosphorous compound in the presence of a diluent that is an aromatic hydrocarbon or a silicone fluid. When the diluent is an aromatic hydrocarbon, a inert support or ortho-phosphoric acid codiluent is advantageously included.