The indole alkaloids 19-epiajmalicine (11), 3-iso-19-epiajmalicine(10), and their oxindole derivatives, formosanine (13) and isoformosanine (14) have been synthesised from a vincoside derivative in a biogenetically patterned reaction sequence.
R. T. Brown and C. L. Chapple, J. Chem. Soc., Chem. Commun., 1974, 740 DOI: 10.1039/C39740000740
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