title: Metabolic oxidation of nicotine to chemically reactive intermediates.
abstract: Studies on the metabolism of nicotine by rabbit liver microsomal fractions in the presence of 0.01 M sodium cyanide have led to the characterization of two isomeric cyanonicotine compounds. The locations of the cyano groups were established by GC--EIMS analyses of the deuterium-labeled products obtained from the specifically deuterium-labeled substrates (S)-nicotine-5',5'-d2, (R,S)-nicotine-2',5',5'-d3, and (R,S)-nicotine-N-methyl-d3. One cyano adduct was shown to be 5'-cyanonicotine, a product previously isolated from similar microsomal preparations. The second cyano adduct was shown to be N-cyanomethyl)nornicotine; this structure assignment was confirmed by synthesis. Formation of N-cyanomethyl)nornicotine appears to occur, at least in part, without prior nitrogen--carbon bond cleavage, implicating the in situ generation of the N-methyleniminium species during the course of metabolic oxidative N-demethylation of nicotine.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D003486:Cyanides / Q000378:metabolism; D066298:In Vitro Techniques; D008297:Male; D008862:Microsomes, Liver / Q000378:metabolism*; D009538:Nicotine / Q000378:metabolism*; D010084:Oxidation-Reduction; D011817:Rabbits
chemical_list: D003486:Cyanides; D009538:Nicotine