Abstract
Abstract Levorotatory 1-amino-2-(4-hydroxyphenyl)ethylphosphonic acid (TyrP) of unknown configuration is a part of hypotensive tri-peptides produced by Actinomycetes1 and is the only 1-aminoalkane phosphonate found so far in living organisms. Nitration of enantiomers of PheP followed by reduction of the p-nitro group and diazotization yielded enantiomers of TyrP of specific rotations +67 and −67° (c.0.9;1n HCl). Single crystal X-ray analysis showed S configuration for dextrorotatory TyrP. Thus, natural levorotatory TyrP has the R configuration and belongs to the L series of aminoacids.
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