Synthesis 2004(3): 359-362  
DOI: 10.1055/s-2004-815922
PAPER
© Georg Thieme Verlag Stuttgart · New York

A One-Pot Conversion of α-Aminoalkylphosphonous Acids into Monomethyl α-Aminoalkylphosphonates

Katja Štrancar, Stanislav Gobec*
University of Ljubljana, Faculty of Pharmacy, Aškerčeva 7, 1000 Ljubljana, Slovenia
Fax: +386(1)4258031; e-Mail: gobecs@ffa.uni-lj.si;
Further Information

Publication History

Received 4 November 2003
Publication Date:
26 January 2004 (online)

Abstract

An excellent method for a one-pot conversion of N-protected α-aminoalkylphosphonous acids into the corresponding monomethyl phosphonates, using thionyl chloride in methanol, has been devised. N-Protected monomethyl α-aminoalkylphosphonates are valuable intermediates in the preparation of phosphapeptides.

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α-Aminoalkylphosphonous acids were N-protected by Cbz and Fmoc protecting group using standard methods. [34] [35] The structures of new N-protected α-aminoalkylphosphonous acids 1g [Pg = Fmoc, R = CH2CH(CH3)2] and 1h [Pg = Fmoc, R = CH(CH3)CH2CH3] were confirmed by 1H NMR, 31P NMR, IR, mass spectra, and elemental analysis.