155141-29-0Relevant articles and documents
Process for the Preparation of Intermediates of Rosiglitazone, Rosiglitazone and New Polymorphic Forms Thereof
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Page/Page column 5-6, (2009/09/28)
The invention relates to a polymorphic form of 5-(4-[2-(N-methyl-N-(2-pyridyl)amino)ethoxy]benzylidene)-2,4-thiazolidinedione (Formula (I)): to a process for its preparation and to the use of such compound for preparing rosiglitazone in the form of a free base or a salt thereof. The invention also relates to a polymorphic form of rosiglitazone in the form of a free base, to a process for its preparation and to the use of such polymorph for preparing a salt of rosiglitazone. The invention also relates to a process of preparing a polymorphic form of a rosiglitazone salt.
PREPARATION OF ROSIGLITAZONE AND ITS SALTS
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Page/Page column 8-9, (2008/06/13)
The present invention relates to rosiglitazone and its pharmaceutically acceptable salts free of at least one of the process related impurities, in particular the dehydro and the succinic acid impurities of rosiglitazone, wherein said impurities are present in an amount of about 05 mg to not more than about 15 mg, and processes for their preparation.
A PROCESS FOR THE CRYSTALLIZATION OF ROSIGLITAZONE AND ITS DERIVATIVES FROM MIXED SOLVENTS
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Page/Page column 20, (2008/06/13)
Crystallization of rosiglitazone of formula (I), its penultimate of formula (II), or salts with acids of formula (III), wherein HX stands for a mineral or carboxylic acid, is carried out from mixed organic solvents, consisting of mixtures of carboxylic acids, particularly formic acid, acetic acid or propionic acid, with aliphatic alcohols, particularly methanol, ethanol, 1-propanol, 2- propanol, butanols or amyl alcohols.
NEW POLYMORPHOUS FORM OF ROSIGLITAZONE MALEATE
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Page/Page column 4-5, (2008/06/13)
A new polymorphous crystalline form of rosiglitazone maleate, called form V, and the methods for obtaining it are described and characterized. Rosiglitazone maleate may be obtained in the form of the single polymorph V by mixing an approximately equimolar mixture of rosiglitazone base and maleic acid into a mixture of alcohols and water, heating the mixture under reflux and subsequently cooling it to ambient temperature.
PROCESS FOR PREPARING THIAZOLIDINEDIONES
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Page/Page column 15, (2008/06/13)
This invention provides a process for reducing an exocyclic double bond at the 5-position of a thiazolidinedione moiety of a thiazolidinedione precursor comprising the steps of: a) preparing a solution or suspension of the thiazolidinedione precursor in a non-ether solvent medium with a base, and b) combining the solution or suspension with a dithionite source. Preferred solvent media include aqueous N,N-dimethylformamide. Sodium dithionite is a preferred dithionite source. In particular the application discloses preparation processes for Pioglitazone, Rosilitazone and Troglitazone.
NOVEL CO-PRECIPITATE
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Page/Page column 16, (2008/06/13)
A novel coprecipitate of amorphous rosiglitazone maleate with a pharmaceutically acceptable carrier, e.g. polyvinylpyrolidone, mannitol, lactose, methylcellulose, cyclodextrin or silicon dioxide, a process for the preparation of said novel co-precipitate and the use of said novel coprecipitate of amorphous rosiglitazone with a pharmaceutically acceptable carrier in the treatment and / or prophylaxis of diabetes mellitus, conditions associated with diabetes mellitus and certain complications thereof, are disclosed. A novel solid solution of rosiglitazone maleate with a pharmaceutically acceptable carrier, preferably with polyethyelene glycol PEG from 4000 to 40.000 of average mol. wt., a process for the preparation thereof and use are disclosed. A novel coprecipitate of amorphous rosiglitazone maleate with a pharmaceutically acceptable carrier and a novel solid solution of rosiglitazone maleate with a pharmaceutically acceptable inert carrier are stable and may be particularly suitable for bulk preparation, handling and formulation advantages.
A PROCESS FOR PURIFICATION
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Page/Page column 13-14, (2010/02/12)
The present invention provides a process for purification of pharmaceutically active compounds selected from the group consisting of thiazolidinedione derivatives and trans-3-Ethyl-2,5-dihydro-4-methyl-N- [2-[4-[[[[(4-methylcyclohexyl)amino] carbonyl] amino]sulfonyl]phenyl]ethyl]-2-oxo-1H-pyrrole-1-carboxamide comprising extraction in a solvent comprising an alkanol (C1-C4) and ammonia.
AMORPHOUS FORM OF ROSIGLITAZONE MALEATE AND PROCESS FOR PREPARATION THEREOF
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Page/Page column 17, (2008/06/13)
An amorphous rosiglitazone maleate and its preparation as well as uses thereof for a pharmaceutical composition and a method for medical treatment including combination therapy are described.
Novel polymorphic forms of 5-[4-[2-[n-methyl-n-(2-pyridyl)amino[ethoxy]benzyl] thiazolidine-2,4-dione maleate and process for their preparation
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, (2008/06/13)
This invention relates to novel polymorphic/pseudopolymorphic forms of 5-[4-[2[N-methyl-N-(2-pyridyl)amino]ethoxy]benzyl] thiazolidine-2,4-dione maleate having formula (I). The invention also relates to a pharmaceutical composition comprising the novel polymorphic form or their mixture and a pharmaceutically acceptable carrier. The polymorphic forms of the present invention are more active, as antidiabetic agent, than the hitherto known 5-[4-[2-[N-(2-methyl-N-(2-pyridyl)amino]ethoxy]benzyl] thiazolidine-2,4-dione maleate.