Abstract
Reaction of deacetylvindoline (2) with excess thionyl chloride gave rise to hexacyclic 6,10-dichloro-6,17-epithio-11-methoxy-1-methyltabersonine (4) as a single product in 43.5% yield. The structure was deduced from 1H and 13C 1D and 2D NMR experiments as well as from mass spectra. A tentative mechanism of this complex transformation was also proposed.
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