Chemical and Chemotaxonomical Studies of Filices. LXXII. Chemical Studies on the Constituents of Odontosoria gymnogrammoides CHRIST

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Abstract
From the fronds of Costarican fern Odontosoria gymnogrammoides CHRIST (Pteridaceae), a phenolic glycoside ''odontoside (I)'', was isolated together with protocatechuic acid, protocatechualdehyde, orientin (II) and 6"-O-acetyl orientin (III, a new compound). The structure of I was unequivocally established by comparing 13C nuclear magnetic resonance spectra of I and 3,4-dimethoxybenzyl dimethylprotocatechuate, which was synthesized by the macrolidelactonization method using cesium carbonate from dimethylprotocatechuic acid and 3,4-dimethoxybenzyl alcohol.