METHOD FOR SYNTHESIZING PIRFENIDONE
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United States of America Patent
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Issued Date -
Dec 24, 2015
app pub date -
Aug 20, 2015
filing date -
Jun 3, 2009
priority date (Note) -
Abandoned
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Abstract
A process for synthesizing pirfenidone from bromobenzene having less than about 0.15% by weight dibromobenze is disclosed. Also disclosed are processes of synthesizing pirfenidone without using ethyl acetate or n-butanol, and pirfenidone having controlled levels of ethyl acetate, n-butanol, di(5-methyl-2-pyridinone)benzenes, and other impurities having specified retention times. Also disclosed are formulated dosage forms including the disclosed pirfenidone.
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