The alkaloids of voacanga thouarsii var. obtusa

Abstract

Voacangine (3), ibogaine (2), voacamine (7), vobtusine (10), voacristine (1), iboluteine (4), vobasine (6), 18′-decarbomethoxyvoacamine (9) and voaluteine (5) are shown to be present in the crude extract from the bark of Voacanga thouarsii, Roem. et Schult. var. obtusa Pichon. All are known compounds. The absolute configuration C-17 R is proposed for the spirannic carbon atom of the pseudoindoxyle (5). Applied to voacristine (1), Brewster's method shows C-20 to have the S-configuration.

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