[Biosynthesis of the aporphine alkaloid bulbocapnine from reticulin. I. Studies on the biosynthesis of alkaloids].
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(+)-Vincamine (1) and (+)-vinpocetine (2) were chlorosulfonylated and the resulting sulfonyl chloride isomers (3-6) were transformed into sulfonamides (7-10). The ester group of sulfonamides was modified by selective hydrolysis and transesterification. Apovincaminol derivatives (14-16) were also prepared by reduction. In addition to the known cerebrovascular effects of the unsubstituted compounds (1,2) sulfonamides also show a significant peripheral vasodilator effect.
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