title: Isolation of three marine prostanoids, possible biosynthetic intermediates for clavulones, from the Okinawan soft coral Clavularia viridis.
abstract: Three marine prostanoids, 1, 2, and 3, were isolated from the extract of the Okinawan soft coral Clavularia viridis. The structures of these compounds were assigned based on the results of spectroscopic analysis. Compound 1 was shown to be preclavulone-A methyl ester, and this is the first isolation of the ester of preclavulone-A as a natural product. Preclavulone-A is proposed to be the key intermediate in the biosynthesis of marine prostanoids exemplified by clavulones in C. viridis. The new prostanoid 3 was suggested to be a biosynthetic intermediate from preclavulone-A to clavulones, and a possible biogenetic pathway via 3 is proposed.
authors.affiliation: School of Life Science, Tokyo University of Pharmacy and Life Science, Horinouchi, Hachioji, Tokyo 192-0392, Japan.
authors.forename: Kinzo
authors.initials: K
authors.lastname: Watanabe
authors.forename: Miyuki
authors.initials: M
authors.lastname: Sekine
authors.forename: Kazuo
authors.initials: K
authors.lastname: Iguchi
mesh_terms: D000818:Animals; D037421:Anthozoa; D007564:Japan; D011453:Prostaglandins / Q000096:biosynthesis / Q000737:chemistry / Q000302:isolation & purification*; D011454:Prostaglandins A / Q000096:biosynthesis / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D011453:Prostaglandins; D011454:Prostaglandins A; C046249:clavulones