Chemical Constituents from Dendrobium hainanense (Orchidaceae) in Hainan

Abstract:

The aim was to understand the chemical constituents of Dendrobium hainanense. Fourteen compounds were isolated from its aerial parts by means of chromatographic techniques. On the basis of spectral data, they were identified as: 2,6-dimethoxy-p-benzoquinone (1), (+)-dehydrovomifoliol (2), blumenol A (3), erianthridin (4), nudol (5), 3,7-dihydroxy-2,4-dimethoxy-phenanthrene (6),3-hydroxy-2,4,7-trimethoxy-9,10-dihydrophenanthrene (7), 3-hydroxy-2,4,7-trimethoxy-9,10-dihydro-phenanthrene (8), 3,4,7-trihydroxy-2-methoxyphenanthrene (9), 3,7-dihydroxy-2,4-dimethoxy-9,10-dihydro-phenanthrene (10), (+)-lyoniresinol (11), (+)- syringaresinol (12), denchrysan A (13) and nobilone (14). All compounds were isolated from D. hainenense for the first time. Compounds 4-6, 8-9, 11 and 14 showed weak inhibitory activity against acetylcholinesterase.