Monocyclic Diterpenes from the Marine Alga Caulerpa trifaria (Chlorophyta)

Abstract

Four novel monocyclic diterpenes (1E,6E)-3-[(E)-acetoxymethylidene]-7-methyl-9-(2,6,6-trimethylcyclohex-2-enyl)nona-1,6-dienyl acetate (5), (E)-2-[(E)-4-methyl-6-(2,6,6-trimethylcyclohex-2-enyl)hex-3-enyl]but-2-enedial (6), (2Z,6E)-3-acetoxymethyl-7-methyl-9-(2,6,6-trimethylcyclohex-2-enyl)nona-1,6-dienyl acetate (7) and (2E,6E)-3-formyl-7-methyl-9-(2,6,6-trimethylcyclohex-2-enyl)nona-2,6-dienyl acetate (8) and the known compounds (1)–(4) have been isolated from the Tasmanian green alga Caulerpa trifaria.