Rearrangement of catharanthine, stemmadenine, and tabersonine in acetic acid

Abstract
Treatment of tabersonine with refluxing acetic acid under nitrogen yielded a new base, allocatharanthine (VI), and the derived (VII), but failed to produce detectable quantities of (±)-catharanthine or pseudocatharanthine, nor did similar treatment of stemmadenine afford any of these compounds.

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