The 2-pyrones of Aniba species

Abstract

A re-examination of the trunk wood of Aniba parviflora (Meissn.) Mez (Lauraceae) yielded two new constituents, 6-(4′-hydroxy-trans-styryl)-2-pyrone (IVf) and 6-(3′,4′-dihydroxy-trans-styryl-2-pyrone (IVe). 6-Cis-styryl-2-pyrone (Va) was also isolated. This, however, is considered to be an artifact, since the wood of other Aniba species, such as A. canelilla (H.B.K.) Mez, A. permollis (Nees) Mez and A. gardneri (Meissn.) Mez, contain only 6-trans-styryl-4-methoxy-2-pyrones (II), besides 6-aryl-4-methoxy-2-pyrones (I). In the leaves of A. gardneri, however, such compounds are accompanied by their photo-transformation products 6-cis-styryl-4-methoxy-2-pyrone (Vb), aniba-dimer-A (VIIb) and aniba-dimer-B (VIIc). © 1971.