Synthesis and biological activities of [alpha]-aminoalkanephosphonic acids and [alpha]-aminoalkanephosphonous acids and their derivatives

Bawa, Fatima (1989) Synthesis and biological activities of [alpha]-aminoalkanephosphonic acids and [alpha]-aminoalkanephosphonous acids and their derivatives. Doctoral thesis, Polytechnic of North London.


A study of preparation methods for alpha-aminoalkanephosphonic, alpha-aminoalkanephosphonous and alpha-aminoalkanephosphinic acids has been made, based on the combined use of an aldehyde, an amino com pound, and a phosphorus reagent. Reported yields are frequently poor and the mechanisms of the reactions are unclear.

The synthesis of alpha-aminoalkanephosphonic acids has been systematically examined. Propanal was used as a model carbonyl compound in reaction with various combinations of the following:
1) (PhO)3P, (PhO)2PH, (MeO)3P, (MeO)2PHO, (Et0)2PH0, PCI3, H3PO3.
2) H2NC02Et, H2NC02CH2Ph, H2NCH2Ph, H2NCHPh2, H2NCONH2 , H2NC0NHPh. NH3.

The yields of various routes developed have ranged from 65% to 12%. The products have been fully characterised by melting point, elemental analysis, and nmr (1H,13C,31P) spectroscopy.

Radiolabelled alpha-amino4 -[14C ]-propanophosphonic acid was prepared for toxicology studies. An interesting feature of this compound has been the formation of chemically identical crystalline products whose melting points differ by 10°C after repeated recrystallisation. The crystal structure of alpha-amino4-[14C]-propanephosphonic acid was determined in order to examine the possibility of different crystalline forms.

31P nmr spectroscopy studies of "one-pot" syntheses of the alpha-aminopropanephosphonic acid have shown that low yields may be due to the formation of several phosphorus-containing by-products and not merely from the problems of isolation.

A range of a-aminoalkanephosphonous acids and their derivatives has been prepared and characterised by nmr (1H,13C, 31P) spectroscopy. These acids were also examined by FAB mass spectrometry and were found to give strong [M+H]+ ions.

New derivatives of alpha-aminopropanephosphonic acid were prepared and characterised. Results of screening tests have been presented.

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