The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2003
Filed:
Jun. 11, 2002
Lynn Resnick, Edison, NJ (US);
Wyeth, Madison, NJ (US);
Abstract
Methods for production of chirally pure &agr;-amino acids and N-sulfonyl &agr;-amino acids are described. An aldehyde and a cyanide salt are reacted with an &agr;-methylbenzylamine to afford product. The product reacts with a strong acid, neutralized, and extracted. The resulting product is hydrolyzed to provide a product which is dissolved in a strong acid to provide a salt of a chirally pure &agr;-amino acid, which is reacted to provide the chirally pure &agr;-amino acid. Another method involves mixing ephedrine hemihydrate and an N-sulfonyl &agr;-ethylnorvaline in ethanol at a molar ratio of 1:1; heating the mixture to dissolve the solids; cooling to allow formation of a precipitate; washing with an organic solvent to give diastereomeric salt; recrystallizing the salt; dissolving the recrystallized salt in an organic solvent and strong aqueous acid, separating the layers; washing the organic extract; drying and concentrating to provide chirally pure N-sulfonyl &agr;-amino acid.