RESVERATROL DIMERS WITH AN OXABICYCLO RING IN VATICA ALBIRAMIS

摘要

Investigation of the chemical constituents in the stem of Vatica albiramis (Dipterocarpaceae) resulted in the isolation of six stilbenoid derivatives, albiraminols C (1) and D (5), vatalbinosides G (2)-I (4), and J (6). We determined their structures by spectroscopic analysis including two- dimensional NMR, comparison of the NMR data based on isomerism, and computer-aided molecular modeling. Compounds 1-5 had two resveratrql units and are the first instance of resveratrol derivatives bearing an oxabicyclo[3.2.2]nonadiene ring system. Compound 6 is the oxidative product of 2 bearing a carbonyl group.