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Four stilbenoids from the orchid Agrostophyllum khasiyanum
P L MAJUMDER, S LAHIRI, N MUKHOTI
Published in Elsevier Ltd
1996
Volume: 42
   
Issue: 4
Pages: 1157 - 1161
Abstract
The orchid Agrostophyllum khasiyanum, which earlier yielded agrostophyllin (7-hydroxy-2,6-dimethoxy-5H-phenanthro[4,5-bcd]pyran), on further chemical investigation has now yielded four more new stilbenoids, besides imbricatin (2,7-dihydroxy-6-methoxy-9,10-dihydro-5H-phenanthro[4,5- bcd]pyran), flaccidinin (2,6-dihydroxy-7-methoxy-5H-phenanthro[4,5-bcd]pyran- 5-one), isoflaccidinin (2,7-dihydroxy-6-methoxy-5H-phenanthro[4,5-bcd]pyran- 5-one) and moscatilin (4,4'-dihydroxy-3,3',5-trimethoxybibenzyl) of previously known structures. The structures of the new stilbenoids, designated agrostophyllone, agrostophylloxin, agrostophylloxidin and agrostophyllidin, were established as 7-hydroxy-2,6-dimethoxy-5H- phenanthro[4,5-bcd]pyran-5-one, 2,6,7-trimethoxy-5H-phenanthro[4,5-bcd]pyran- 5-one, 7-hydroxy-2,5,6-trimethoxy-5H-phenanthro[4,5-bcd]pyran and 7-hydroxy- 2,6-dimethoxy-9,10-dihydro-5H-phenanthro[4,5-bcd]pyran, respectively, from spectral and chemical evidence.
About the journal
JournalData powered by TypesetPhytochemistry
PublisherData powered by TypesetElsevier Ltd
ISSN0031-9422