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■ New Tabernamine Derivatives from Tabernaemontana

Toh-Seok Kam* and Kooi-Mow Sim

*Department of Chemistry, Unviersity of Malaya, Pantai Valley, 50603 Kuala Lumpur, Malaysia

Abstract

Three new bisindole alkaloids of the vobasine-iboga type, which are derivatives of tabernamine, viz., 19’(S)-hydroxytabernamine, 19’(R)-hydroxy-tabernamine, and 19‘-oxotabernamine, were isolated from the stem-bark extract of Tabernaemontana corymbosa and the structures were established by spectroscopic analysis.