Mechanism for iridane skeleton formation from acyclic monoterpenes in the biosynthesis of secologanin and vindoline in Catharanthus roseus and Lonicera morrowii.

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Administration of various tritium-labeled monoterpenes to Catharanthus roseus and Lonicera morrowii demonstrated that the loganin (1), secologanin (2) and vindoline (10) of these plants are biosynthesized via cyclization of 10-oxogeranial (11a) or 10-oxoneral (11b) to iridodial (12) and subsequent oxidation to iridotrial (4).

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