A new diterpene from the leaves of Andrographis paniculata Nees.
Phytochemical investigation of the ethanol extract of the leaves of Andrographis paniculata yielded one novel diterpene (13R, 14R) 3, 13, 14, 19-tetrahydroxy-ent-labda-8 (17), 11-dien-16, 15-olide 1 which has an uncommon cis-diol groups in the lactone moiety, and 3, 19-isopropylidene-14-deoxy-ent-labda-8 (17), 13-dien-16, 15-olide 2, probably an artifact diterpene, together with eight known diterpenoids 3-10. The structures of these compounds were determined on the basis of spectral methods. The structure and stereochemistry of 1 was confirmed by X-ray crystallographic analyses.
Xu
Chong
C
The MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201210, PR China.
Chou
Gui Xin
GX
Wang
Zheng Tao
ZT
D035685:Andrographis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry
C553653:(13R,14R)3,13,14,19-tetrahydroxy-ent-labda-8(17),11-dien-16,15-olide; D004224:Diterpenes