1-Methyl-1,2,3,4-tetrahydro-β-carboline-1-carboxylic acid (3) is shown to be an intact precursor for harman (5) in Passiflora edulis and for eleagnine (6) in Eleagnus angustifolia; it is a natural constituent of both these plants; (3) is at least an 8-fold better precursor for (5) than is N-acetyltryptamine (11).
R. B. Herbert and J. Mann, J. Chem. Soc., Perkin Trans. 1, 1982, 1523 DOI: 10.1039/P19820001523
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