Stilbenoids such as resveratro have drawn much attention due to their roles in foods and beverages, and their diverse biological activities. These compounds, either in their glycosylated or non-glycosylated form, are typically found as oligomers in few plant families, such as Dipterocarpaceae, Vitaceae, Cyperaceae, and Gnetaceae. The rich structural variation and multifunctional bioactivity make stilbenoid oligomers interesting targets for detailed phytochemical investigations. Dipterocarpaeaeous plants are known to contain resveratrol oligomers, and their occurrences in Vatica, Vateria, Shorea, and Hopea genera have been discussed in our previous works. Vatica, a genus comprising 65 species, belongs to the largest subfamily of Dipterocarpoideae in the Dipterocarpaceae, most of which are native to Southeast Asia. The genus Vatica is well known for its abundance of resveratrol oligomers. In our current phytochemical studies of Dipterocarpaceae, the chemical constituents of V. albiramis were exzmined, and 14 new resveratrol oligomers (1, 2, 6-15, 19, and 24) were isolated, together with 15 known resveratrol derivatives. To the best our knowledge, 1 is the first resveratrol hexamer posseseing 9-Oxa-bicyclo[3,3,1] nonadiene ring system with dimer unit and one aromatic ring (E_1) rearranged like a 1, 2-aryl migration. Furthermore, Some unusual spectroscopic properties observed in new compounds in NMR spectrum are also comprehensiely discussed.
