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Stilbenoids and flavonoids from the orchids Coelogyne uniflora, Ione paleacea and Acrochoene punctata
P L MAJUMDER, , S SEN
Published in SCIENTIFIC PUBL-INDIA
2002
Volume: 79
   
Issue: 2
Pages: 169 - 175
Abstract
The orchid Coelogyne uniflora afforded earlier a steroidal ester, uniflorin. Further investigation of this orchid has now resulted in the isolation of two new phenanthropyrone derivatives, unifloranthrone and uniflorinanthrone, besides flavidin (1a), flavidinin (1c), isoflvidinin (1d) and oxoflavidin (1e). The structures of unifloranthrone and uniflorinanthrone were established as 2,7-dihydroxy-5H-phenanthro[4,5-bcd]pyran-5-one (2a) and 2,7-dimethoxy-5H-phenanthro[4,5-bcd]pyran-5-one (2c), respectively, from spectral and chemical evidence. Chemical investigation of the orchid Ione paleacea yielded two flavanone derivatives, 5,7-dihydroxy-6-methoxy-2-phenyl-2,3-dihydro-4H-1-benzopyran-4-one (3a) and 5,7-dihydroxy-6-methoxy-2-(4′-hydroxyphenyl)-2, 3-dihydro-4H-1-benzopyran-4-one (3c), besides the known stilbenoids, 3-hydroxy-5-methoxybibenzyl (4a), batatasin-III (4c) and gigantol (4e). The orchid Acrochoene punctata afforded two known bibenzyl derivatives, viz. 3,4′-dihydroxy-5-methoxybibenzyl (4f) and 4,4′ -dihydroxy-3,5-dimethoxybibenzyl (4g). Additional NMR spectral evidence was provided for further confirmation of the structures of 3a, 3c, 4a and 4g.
About the journal
JournalJournal of the Indian Chemical Society
PublisherSCIENTIFIC PUBL-INDIA
ISSN0019-4522
Open AccessNo