Wyckoff Chemical Company, Inc.

Richard S Olsen

James J Springer

James M VanderRoest

The present invention comprises a process for preparing essentially pure 1,2-dihydro-6-alkyl-2-oxo-5-(pyridinyl)-nicotinonitriles from a crude reaction mixture containing the corresponding amide as an impurity. By 'essentially pure' is meant a level of purity acceptable for orally administered pharmaceutical products, usually less than 0.1% of any single impurity. At least a stoichiometric amount of an acylating agent is reacted with the crude reaction mixture, and thereafter recovering essentially pure 1,2-dihydro-6-alkyl-2-oxo 5-(pyridinyl)-nicotinonitrile.

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South Haven, MI, United States of America

Richard S Olsen