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neo-Clerodane diterpenoids from Scutellaria barbata
Friday, November 19, 2010 -
Scutebarbatines W―Z, new neo-clerodane diterpenoids from Scutellaria barbata and structure revision of a series of 13-spiro neo-clerodanes
Fei Wang,* Fu-Cai Ren, Ya-Ju Li, Ji-Kai Liu*
Chem. Pharm. Bull., 2010, 58(9): 1267-1270
Four new neo-clerodane diterpenoids, scutebarbatines W―Z (1―4), were isolated from the ethanol extract of Scutellaria barbata (Labiatae), and their structures were elucidated on the basis of extensive spectroscopic studies. In addition, the proposed structures of at least seven 13-spiro subtype neo-clerodanes: scutehenanine B (5), scutebarbatine G (6), 6-O-nicotinoylscutebarbatine G (7), barbatin A (8), 6,7-di-O-nicotinoylscutebarbatine G (9), 6-O-nicotinoyl-7-O-acetylscutebarbatine G (10), and scutebarbatine F (11), reported by Dai and co-workers from the same species, were incorrectly assigned and have been revised by reanalysis of the published NMR data.
Notes
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JCR 2010 --- Natural Product Chemistry
Wednesday, June 29, 2011 -
neo-Clerodane diterpenoids from Scutellaria barbata
Friday, November 19, 2010 -
Bi-linderone and linderaspirone A
Wednesday, July 21, 2010 -
JCR 2009 --- Natural Product Chemistry
Tuesday, June 22, 2010 -
Iridoid glycosides from Callicarpa
Friday, April 9, 2010 -
ent-Pimaranes from Siegesbeckia orientalis
Saturday, December 5, 2009 -
Structure revision of an isoflavonoid
Sunday, November 1, 2009 -
C-24 configuration in stigmasterol
Thursday, August 27, 2009 -
JCR 2008 --- Natural Product Chemistry
Monday, June 22, 2009 -
A novel A-ring contracted oleanane triterpenoid
Sunday, May 31, 2009