Incorporation of stereospecifically labelled L-tryptophan into cryptoechinuline A (3), which has been assigned the (z)-configuration from examination of its natural and 13C-enriched 13C n.m.r. spectra, proceeds with removal of a pro-S hydrogen atom from the β-methylene position; a new metabolite, cryptoechinuline C (5) has also been isolated.
R. Cardillo, C. Fuganti, D. Ghirnghelli, P. Grasselli and G. Gatti, J. Chem. Soc., Chem. Commun., 1975, 778 DOI: 10.1039/C39750000778
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