title: New seco-prezizaane-type sesquiterpenes, jiadifenin with neurotrophic activity and 1,2-dehydroneomajucin from Illicium jiadifengpi.
abstract: Two new seco-prezizaane-type sesquiterpenes, 1,2-dehydroneomajucin (1) and jiadifenin (2), were isolated from the methanol extract of the pericarps of Illicium jiadifengpi, indigenous to the southern part of China. Their structures were elucidated on the basis of NMR data. Compound 2, which is an equilibrated mixture of the epimers 2a and 2b on the C-10 acetal carbon, is the first example of a majucin-type seco-prezizaane with an oxo-function at the C-10 position. The proposed structure for 2 was unambiguously confirmed by chemical conversion of the known sesquiterpene (2S)-hydroxy-3,4-dehydroneomajucin (5) to 2. Compounds 2 and 5 were found to significantly promote neurite outgrowth in primary cultures of fetal rat cortical neurons at concentrations from 0.1 to 10 microM.
authors.affiliation: Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Yokoyama
authors.forename: Jian-Mei
authors.initials: JM
authors.lastname: Huang
authors.forename: Chun-Shu
authors.initials: CS
authors.lastname: Yang
authors.forename: Yoshiyasu
authors.initials: Y
authors.lastname: Fukuyama
mesh_terms: D000818:Animals; D002478:Cells, Cultured / Q000187:drug effects; D002681:China; D029523:Illicium / Q000737:chemistry*; D013058:Mass Spectrometry; D008968:Molecular Conformation; D015394:Molecular Structure; D009414:Nerve Growth Factors / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification* / Q000494:pharmacology; D009474:Neurons / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D051381:Rats; D012717:Sesquiterpenes / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification* / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C457980:1,2-dehydroneomajucin; D009414:Nerve Growth Factors; D012717:Sesquiterpenes; C457979:jiadifenin