Chemical Constituents Of Bulbophyllum Wendlandianum (Kraenzl.) Dammer And Their Chemotaxonomic Significance

Phytochemical investigation of Bulbophyllum wendlandianum (Kraenzl.) Dammer led to the isolation of twentythree compounds 1-23 (flavanthrinin 1, coelonin 2, lusianthridin 3, densiflorol B 4, plicatol B 5, batatasin-lll 6, gigantol 7, 5-hydroxy-3,3 '-dimethoxy-2-(p-hydroxybenzyl) bibenzyl 8, 2,2-dimethyl-5-hydroxy-6-carboxy-7(2-phenylethyl) 9, tristin 10, p-hydroxybenzyl ethyl ether 11, p-hydroxybenzaldehyde 12, hydroquinone 13, coniferaldehyde 14, p-hydroxybenzyl alcohol 15, 3,4-dihydroxy benzaldehyde 16, stigmasterol 17, beta-sitosterol 18, ergosterol peroxide 19, (+)pinoresinol 20, n-butyl sulfoxide 21, tridec-4E-en-l-yl acetate 22, ethyl linolate 23) including five phenanthrenes 1-5, five bibenzyls 6-10, six phenols 11-16, three sterols 17-19, one lignan 20, one n-butyl sulfoxide 21 and two fatty acids 22-23. The structures of these compounds were elucidated by spectroscopic analyses. This is the first report of isolation of compounds 1-23 from Bulbophyllum wendlandianum and compounds 8-9, 11, 13, 15-16 and 19-23 within genus Bulbophyllum. Compound 21 is a new natural product, isolated from a natural source for the first time. Furthermore, the chemotaxonomic significance of the isolates was also discussed.