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Revised structure and synthesis of piperolein acids, guineensine and wisanine from Piper guineense

โœ Scribed by S.K. Okwute; J.I. Okogun; D.A. Okorie

Publisher
Elsevier Science
Year
1984
Tongue
French
Weight
548 KB
Volume
40
Category
Article
ISSN
0040-4020

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โœฆ Synopsis

The structures of pipcrolein acids guineensine and wisanine have been confirmed by synthesis. UV irradiation of trans piperolein B acid ester gave the &-isomer reported in the literature as the truns-isomer. The tram-2, trans-4 ethylenic bonds in guineensine and wisanine were introduced by reacting piperolein B aldehyde and 2-methoxy piperonal with the appropriate Wittig or Reformatsky reagent.

Recently we reported' the isolation and constitution R = -CO2H

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