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Issue 0, 1971
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Selective esterification, substitutions (SN1), and transformations of flavan-3,3′,4,4′,7-pentaols

Abstract

The 3- and 4-monoacetates of (+)-3′,4′,7-trimethoxy-2,3-trans-flavan-3,4-trans-diol have been prepared for the first time. These compounds show different mass spectral fragmentation patterns.

Substitutions by primary alcohols result in mixtures (1 : 2) of 2,3-trans-3,4-trans- and 2,3-trans-3,4-cis-4-alkyl ethers irrespective of whether the trimethyl ethers of the 3,4-trans- or the 3,4-cis-flavan-3,4-diols are used as reactants. The 3-acetates of 2,3-trans-3,4-cis-4-alkyl ethers have an unusual twist-boat conformation.

Treatment of (+)-flavan-3,3′,4,4′,7-pentaol with mercaptoacetic acid results in similar substitution restricted to the 4-position, without heterocyclic ring fission. When access of air is permitted, optically pure dihydroflavonol and flavanone analogues are formed in prominent side reactions. The mechanism of their formation is discussed.

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Article information


J. Chem. Soc. C, 1971, 336-342
Article type
Paper

Selective esterification, substitutions (SN1), and transformations of flavan-3,3′,4,4′,7-pentaols

I. C. du Preez, D. Ferreira and D. G. Roux, J. Chem. Soc. C, 1971, 336
DOI: 10.1039/J39710000336

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