Process for the preparation of chirally pure N-(trans-4-is)
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United States of America Patent
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Aug 3, 2010
Grant Date -
Feb 22, 2007
app pub date -
Jul 8, 2004
filing date -
Jul 10, 2003
priority date (Note) -
Expired
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Abstract
The invention relates to N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine (nateglinide) in the novel crystalline form “G” and a process for the preparation thereof. A process for the preparation of chirally pure nateglinide by treating a lower alkyl ester thereof with a base to yield an alkali salt and liberating the product from said salt by proper addition of an acid, is also provided. Still another aspect of the invention is a process for the preparation of nateglinide in the crystalline form “H” from other crystalline modifications of nateglinide.
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