US2015141658A1PendingUtilityA1

Preparation of febuxostat

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Assignee: REDDYS LAB LTD DRPriority: Apr 29, 2010Filed: Jan 19, 2015Published: May 21, 2015
Est. expiryApr 29, 2030(~3.8 yrs left)· nominal 20-yr term from priority
Inventors:Praveen CherukupallySreenadha Charyulu KandalaVijay Kumar AdlaChandra Sekhar Vempati
C07B 2200/13A61P 19/06C07D 277/30C07D 277/56
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Claims

Abstract

Processes for preparing febuxostat.

Claims

exact text as granted — not AI-modified
1 .- 14 . (canceled) 
     
     
         15 . A process for the preparation of crystalline Form III of febuxostat, comprising recrystallizing febuxostat from a solution in a combination of an ester solvent and a hydrocarbon solvent. 
     
     
         16 . The process of  claim 15 , wherein an ester solvent comprises ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, or tertiary-butyl acetate. 
     
     
         17 . The process of  claim 15 , wherein a hydrocarbon solvent comprises toluene, xylene, n-hexane, n-heptane, or cyclohexane. 
     
     
         18 . The process of  claim 15 , wherein an ester solvent is ethyl acetate and a hydrocarbon solvent is n-hexane. 
     
     
         19 .- 20 . (canceled)

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