An unusual bisnor-clerodane diterpenoid from Polyalthia simiarum.
The stem bark of Polyalthia simiarum has yielded a new bisnor-type clerodane diterpenoid, 2-oxo-14,15-bisnor-3,11E-kolavadien-13-one (1), and three previously known clerodane derivatives, kolavenic acid (2), 16beta-hydroxycleroda-3,13(14)Z-dien-15,16-olide (3), and 16-oxocleroda-3,13(14)E-dien-15-oic acid (4). The structures of these compounds were unambiguously determined by extensive NMR studies as well as by comparison with related compounds. Till now this is the second report of the occurrence of any unusual C-18 clerodane diterpenoid from nature. The crude light petroleum extract and the purified compound 3 demonstrated moderate free radical scavenging activity with IC50 values of 21.5 and 23.5 microg/mL, respectively.
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka, Dhaka-1000, Bangladesh.
Selina
S
Kabir
Mohammad S
MS
Rahman
A M Sarwaruddin
AM
Chowdhury
Choudhury M
CM
Hasan
Mohammad A
MA
Rashid
D004224:Diterpenes / Q000302:isolation & purification; D045785:Diterpenes, Clerodane / Q000737:chemistry / Q000302:isolation & purification*; D031044:Polyalthia / Q000737:chemistry*
D004224:Diterpenes; D045785:Diterpenes, Clerodane; C072583:polyalthialdoic acid; C072582:kolavenic acid; C072581:16-hydroxycleroda-3,13(14)-dien-15,16-olide