A total synthesis of the vasicinone
family of natural products
from bulk chemicals was developed. Reductive condensation of o-nitrobenzaldehydes with amines utilizing iron pentacarbonyl
as a reducing agent followed by subsequent oxidation leads to a great
variety of polycyclic nitrogen-containing heterocycles under mild
conditions. Enantiomerically pure vasicinone, rutaecarpine, isaindigotone,
and luotonin were synthesized from readily available starting materials
like hydroxyproline, nitrobenzaldehyde, pyrrolidine, and piperidine
in two to four operational steps without chromatography. The antifungal
activity of all products was tested.
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