From the root bark of the Apocynaceae Gabunia eglandulosa STAPE seven indole alkaloids were isolated. Besides the known indole alkaloids (−)‐isovoacangine (1), (−)‐coronaridine (2), voacamine (3), vobasine (4), and perivine (5), two new bases (−)‐19‐hydroxy‐isovoacangine (6) and 19‐hydroxy‐coronaridine (15) were isolated. Compound 6 was obtained by oxidation of isovoacangine with iodine. Similar oxidation reactions with voacangine (12) were studied.
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Agwada et al. (1975) studied this question.
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