title: 18-nor-Podocarpanes and podocarpanes from the Bark of Taiwania cryptomerioides.
abstract: Seven nor- and podocarpane-type diterpenes were isolated from the bark of Taiwania cryptomerioides Hayata, including three 18-nor-podocarpanes: 18-nor-1beta,4alpha,14-trihydroxy-13-methoxy-8,11,13-podocarpatriene (1), 18-nor-1beta,4alpha,13,14-tetrahydroxy-8,11,13-podocarpatrien-7-one (2), 18-nor-1beta,4alpha,14-trihydroxy-13-methoxy-8,11,13-podocarpatrien-7-one (3), 1beta,14,19-trihydroxy-13-methoxy-8,11,13-podocarpatrien-7-one (4), 1beta,13,14,18-tetrahydroxy-8,11,13-podocarpatrien-7-one (5), 18-acetoxy-1beta,13,14-trihydroxy-8,11,13-podocarpatrien-7-one (6), and 1beta,14,18-trihydroxy-13-methoxy-8,11,13-podocarpatrien-7-one (7). Their structures were determined by application of 1D and 2D NMR spectroscopy and other techniques. Podocarpane-type diterpenes do not occur extensively in nature, and the presumed oxidative enzyme in this plant will be of interest to identify.
authors.affiliation: Tsuzuki Institute for Traditional Medicine, College of Pharmacy, China Medical University, Taichung 404, Taiwan, ROC.
authors.forename: Shih-Chang
authors.initials: SC
authors.lastname: Chien
authors.forename: Cheng-Chi
authors.initials: CC
authors.lastname: Chen
authors.forename: Hsi-Lin
authors.initials: HL
authors.lastname: Chiu
authors.forename: Chi-I
authors.initials: CI
authors.lastname: Chang
authors.forename: Mei-Hwei
authors.initials: MH
authors.lastname: Tseng
authors.forename: Yueh-Hsiung
authors.initials: YH
authors.lastname: Kuo
mesh_terms: D029779:Cupressaceae / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D014197:Trees / Q000737:chemistry
chemical_list: D004224:Diterpenes; D010936:Plant Extracts