TROPICAL MARINE-ALGAE .7. THE CHEMICAL-COMPOSITION OF MARINE-ALGAE FROM NORTH QUEENSLAND WATERS

Details of the secondary metabolite content of seven species of red algae (Rhodophyta), four species of brown algae (Phaeophyta), two species of blue-green algae (Cyanophyta), and six species of green algae (Chlorophyta) from coastal waters of North Queensland, Australia, between 15° S and 20° S of the equator, are reported. Although many of these metabolites are not new natural products, several as yet unreported compounds were identified. A specimen of the red alga Laurencia majuscula yielded the novel metabolites (1Z,8R*,9R*)-8-bromochamigra-1,11(12)-dien-9-ol [31], and (1R*,2S*,3R*,5S*,8S*,9R*)-2,3,5,9-tetramethyltricyclo[6.3.0.01,5]undecan-3-ol [32]. A sample of Dictyopteris delicatula afforded the novel metabolite (1R*,3R*,4S*, 11 R *)-3,4;7,8-bisepoxydolabellan-12(18)-ene [54]. A specimen of a shallow-water Lyngbya sp. yielded the novel metabolite 8ʹ-deacetoxymalyngamide C [60], and from a collection of Chlorodesmis fastigiata the novel metabolite (2E,6 E, 10 E)-1-acetoxy-3-acetoxymethyl-7,11,15-trimethylhexadeca-2,6,10,14-tetraene [66] was isolated. © 1990, American Chemical Society. All rights reserved.