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The previously unknown 19α-20,21-dehydroheteroyohimbine, 19-epicathenamine (3a), its water adducts (6), and cathenamine (2a) from which it is apparently formed, have been obtained by glucolysis of strictosidine (1); 2H and 18O studies indicate that the 19β/19α interconversion in water does not involve a dienamine (8) or (6).
R. T. Brown and J. Leonard, J. Chem. Soc., Chem. Commun., 1979, 877 DOI: 10.1039/C39790000877
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