22 research outputs found
Chemistry of the Podocarpaceae. XXIV. Ring-A modifications of Abieta- 8,11,13-trien-18-oic acid
No full textChemistry of the Podocarpaceae. XXIX. The preparation of 6-oxygenated derivatives of Abieta-8,11,13-trien-18-oic acid
No full textChemistry of the Podocarpaceae. XXVII. Ring-c modifications of methyl abieta-8,11,13-trien-18-oate
No full textChemistry of the Podocarpaceae. XXXI. Reactions of ring-A epoxy derivatives of 18-Norabieta-8,11,13-triene and 12-Methoxy-18-norpodocarpa-8,1 1,13-triene
No full text
Synthesis of flavonoid-type compounds from methyl dehydroabietates
No full textThe synthesis of new flavone-type compounds bearing several chiral centres, 12- and 14-(2'-chromonyl)dehydroabietates, are reported. This synthesis started from the aldol condensation of methyl 12- and 14-formyldehydroabietates with 2'-hydroxyacetophenones in order to prepare the corresponding chalcone-type compounds, which were then transformed in the expected flavone-type compounds by cyclodehydrogenation with DMSO and a catalytic amount of iodine. All compounds were exhaustively characterised by NMR and MS techniques.FCT/FEDER - Organic Chemistry Research UnitFCT/FEDER - PRAXIS XXI/BD/15786/9
