PROCESS FOR PREPARING DIPEPTIDYL PEPTIDASE IV INHIBITORS AND INTERMEDIATES THEREFOR

摘要

A process for preparing an amine of the structure
which comprises
a. treating an aqueous solution of a keto acid of the structure
with ammonium formate, nicotinamide adenine dinucleotide, dithiothreitol and partially purified phenylalanine dehydrogenase and/or formate dehydrogenase enzyme (PDH/FDH); and
b. adjusting pH of the reaction mixture with sodium hydroxide to form the desired amine which is substantially free of undesirable excess ammonium ions.