Stereoselective transformation of ajmaline into three minor Gelsemium alkaloids, koumidine, (19Z)-anhydrovobasinediol [(19Z)-taberpsychine] and N-demethoxyrankinidine and their absolute configuration
Abstract
Ajmaline was converted into new Gelsemium alkaloids, 19Z-anhydrovobasinediol [(19Z)-taberpsychine] and N-demethoxyrankinidine, via koumidine along the biomimetic sequence, and the absolute configuration of these alkaloids was determined by these transformations.
 
                



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