A solution of anhydrovinblastine (3) in acetonitrile led, through a spontaneous oxidation–reduction process, not only to leurosine (4) and catharine (9) but also to other main antitumour alkaloids of Catharanthus spp.: vinblastine (5), leurosidine (6), and their deoxy derivatives (7) and (8).
N. Langlois and P. Potier, J. Chem. Soc., Chem. Commun., 1979, 582 DOI: 10.1039/C39790000582
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