1 H n.m.r. spectral analysis shows that the β-hydroxyleucine portion of the peptide alkaloids frangulanine and discarine A and B possess and erythro-configuration; stereochemical analysis of frangulanine by enzymic oxidation of its product of reduction and subsequent hydrolysis reveals the subunit to be of the L-erythro-β-hydroxyleucine-type.
M. G. Sierra, O. A. Mascaretti, F. J. Diaz, E. A. Rúveda, C. Chang, E. W. Hagaman and E. Wenkert, J. Chem. Soc., Chem. Commun., 1972, 915 DOI: 10.1039/C39720000915
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