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Studies on thein vitro hepatic microsomal formation of amides during the metabolism of certain secondary and tertiary benzylic amines

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Summary

Part of our interest during the last few years has been to investigate the possible intermediate(s) and mechanism(s) involved in the formation of amides from N-benzylic amines. A number of benzylic amines with different aryl and alkyl moieties introduced onto the constituent nitrogen were prepared, thus creating a wide variety of secondary, tertiary and heterocyclic benzylic amines with different logP and pKa characteristics (Tables I & II). In some experiments, the possible intermediates of this reaction,i.e. nitrones (Table III), imines (Table IV) and amides themselves (Table V), were used as substrates in our metabolic studies. Theirin vitro hepatic microsomal metabolism was studied in order to obtain a structure/metabolic activity relationship for the formation of amides from benzylic amines. This communication reviews these studies and reports our conclusions as to the mechanism of formation of amides from N-benzylic amines.

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References

  1. Gorrod J.W., Gooderham N.J. (1985): Microsomal N- and C-oxidation of 4-substituted N-benzylanilines. Xenobiotica, 15, 1021–1031.

    Article  PubMed  CAS  Google Scholar 

  2. Gooderham N.J., Gorrod J.W. (1986): Microsomal formation of amides from secondary aromatic amines. In: Gorrod J.W. (ed) Development of Drugs and Modern Medicines. Chichester: Ellis Horwood, 318–323.

    Google Scholar 

  3. Ülgen M., Gorrod J.W., Barlow D. (1994): Structure-activity relationships in the formation of amides from substituted N-benzylanilines. Xenobiotica, 24, 735–748.

    Article  PubMed  Google Scholar 

  4. Low C.M., Ülgen M., Gorrod J.W. (1994): The recognition of a diarylimine as a metabonate produced during incubation of N-benzyl-4-chloroaniline with hepatic microsomal preparations. J. Pharm. Pharmacol., 46, 585–590.

    PubMed  CAS  Google Scholar 

  5. Küçükgüzel I., Ülgen, M., Gorrod J.W. (1997):In vitro microsomal metabolism of chlorine substituted secondary amines and imines. Eur. J. Drug Metab. Pharmacokinet., 22, 351–358.

    PubMed  Google Scholar 

  6. Splitter J.S., Calvin M. (1958): Preparation of oxaziranes by irradiation of nitrones. J. Org. Chem., 23, 651.

    Article  CAS  Google Scholar 

  7. Ülgen M., Yilmaz F., Unsalan S., Gorrod J.W. (1995): Chemical and metabolic studies on N-benzyl-tert-butylamine and its potential metabolites. Drug Metab. Drug Interact., 12, 131–143.

    Google Scholar 

  8. Küçükgüzel I., Ülgen M. (1998):In vitro metabolic fate of N-substituted dibenzylamines: investigation of biological oxidation site on nitrogen compounds with different pKa. J. Fac. Pharm. Ist., 32, 69–86.

    Google Scholar 

  9. Ülgen M., Ozer U., Küçükgüzel I., Gorrod J.W. (1997): Microsomal metabolism of N-benzyl-N-ethylaniline and N-benzyl-N-ethyl-p-toluidine. Drug Metab. Drug Interact., 14, 83–98.

    Google Scholar 

  10. Küçükgüzel I., Ülgen M., Gorrod J.W. (1999):In vitro hepatic microsomal metabolism of N-benzyl-N-methylaniline. Farmaco, 54, 331–337.

    Article  PubMed  Google Scholar 

  11. Ülgen M., Gorrod J.W. (1996): The failure of substrate pKa to influence the microsomal formation of amides from N-benzylamines. The microsomal metabolism of N-benzyl-pyrrolidine, N-benzylcarbazole and N-acetyl-N-benzyl-4-methylaniline. J. Pharm. Pharmacol., 48, 1320–1326.

    PubMed  Google Scholar 

  12. Ülgen M., Kajbaf M., Lamb J., Jahanshahi M., Gorrod J.W., Naylor S. (1994): Characterization of N-benzylcarbazole and its metabolites from microsomal mixtures by tandem mass spectrometry. Eur. J. Drug Metab. Pharmacokinet., 19, 343–348.

    Article  PubMed  Google Scholar 

  13. Gorrod J.W., Temple DJ. (1976): The formation of an N-hydroxymethyl intermediate in the N-demethylation of N-methylcarbazolein vivo andin vitro. Xenobiotica, 6, 265–274.

    Article  PubMed  CAS  Google Scholar 

  14. Küçükgüzel I, Ülgen M., Gorrod J.W. (1997): Effect of nitrogen pKa on the microsomal oxidation of N-benzylic heterocycles. Poster presented at The First International Symposium on Pharmaceutical Chemistry, Hacettepe University, Faculty of Pharmacy, Ankara, Turkey, September 24–26. 1997.

  15. Yilmaz F., Ülgen M., Gorrod J.W. (1999): Thein vitro hepatic microsomal metabolism of N-benzyladamantanamine in rats. Drug Metab. Drug Interact., 15, 115–125.

    CAS  Google Scholar 

  16. Ülgen M., Gorrod J.W. (1994): Metabolic and chemical studies on N, α-diarylnitrones. Drug. Metab. Drug Interact., 11, 245–257.

    Google Scholar 

  17. Gorrod J.W., Ülgen M. (1994): Metabolic N-oxidation of diarylimines: a new metabolic reaction of potential toxicological significance. Drug. Metab. Rev., 26, 241–252.

    Article  PubMed  CAS  Google Scholar 

  18. Ülgen M., Gorrod J.W., Unsalan S., Yilmaz F. (1994): Metabolic and chemical studies on aryl-alkylimines and their potential metabolites. Poster presented at The First International Meeting on Scientific Basis of Modern Pharmacy, June 8–11, 1994, Athens, Greece.

  19. Ülgen M., Erçak K., Küçükgüzel I., Gorrod J.W. (1997):In vitro microsomal metabolic studies on secondary aromatic amides. Boll. Chim. Farm., 136, 239–243.

    Google Scholar 

  20. Ülgen M. (1999): Chemical artefacts in drug metabolism research. Boll. Chim. Farm., 8, 388–396.

    Google Scholar 

  21. Beckett A.H. (1971): Metabolic oxidation of aliphatic basic nitrogen atoms and their α-carbon atoms. Xenobiotica, 1, 365–383.

    Article  PubMed  CAS  Google Scholar 

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Ülgen, M., Gorrod, J.W. Studies on thein vitro hepatic microsomal formation of amides during the metabolism of certain secondary and tertiary benzylic amines. Eur. J. Drug Metab. Pharmacokinet. 25, 145–150 (2000). https://doi.org/10.1007/BF03190081

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