Antifungal diterpenoid alkaloids from Delphinium denudatum

The roots of Delphinium denudatum have yielded a new diterpenoid alkaloid, 8-acetylheterophyllisine (1), in addition to the known alkaloids vilmorrianone (2), panicutine (3), denudatine (4), isotalatizidine (5), and condelphine (6), as well as 3-hydroxy-2-methyl-4H-pyran-4-one (7). Compounds 1, 3, and 7 have not been isolated from this plant previously. The structures of compounds 1, 3, and 7 were determined through spectral and X-ray diffraction analyses. Compounds 1-3 have shown antifungal activity against a number of human pathogenic fungi.

Antifungal steroidal lactones from Withania coagulance

Two new withanolides, 14,15 beta-epoxywithanolide I [(20S,22R) 17 beta, 20 beta-dihydroxy-14 beta,15 beta-epoxy-1-oxo-witha-3,5,24-trienolide] and 17 beta-hydroxywithanolide K (20S,22R) 14 alpha,17 beta,20 beta-trihydroxy-1-oxo-witha-2,5,24-trienolide] have been isolated from the whole plant of Withania coagulance and their structures were elucidated by spectroscopic techniques. The latter compound was found to be active against a number of potentially pathogenic fungi.

Chemical Constituents of Buxus sempervirens

BUXUS SEMPERVIRENS (Buxaceae) of Turkish origin has yielded a new steroidal alkaloid, (-)-( Z)-buxenone ( 1) along with its known isomer (-)-( E)-buxenone ( 2). The plant also yielded 4',5-dihydroxy-3,3',6,7-tetramethoxyflavone ( 3) and artemetin (5-hydroxy-3,3',4',6,7-pentamethoxyflavone) ( 4). These flavones have not been isolated from BUXUS species previously.

N-Formylcyclomicrobuxeine - A New Alkaloid from the Leaves of Buxus papillosa

Studies on the alkaloidal constituents of the leaves of BUXUS PAPILLOSA have resulted in the isolation of a new steroidal base, (+)- N-formylcyclomicrobuxeine ( 1).

N-Benzoyl-16-acetylcycloxobuxidine: A New Alkaloid from the Leaves of Buxus papilosa

A new alkaloid, N-benzoyl-16-acetylcycloxobuxidine, has been isolated from the leaves of BUXUS PAPILOSA, to which structure 1 has been assigned.