Rj Wells

New diterpene isocyanides from a sponge

Abstract Six new diterpene isocyanides have been isolated from a sponge ( Adocia sp.). Their structures support the biosynthetic suggestion for the formation of diisocyanoadociane reported from the same sponge.

Acyclic diterpenes containing 3 enol acetate groups from the green algaChlorodesmis fastigiata

2 new diterpenes, chlorodesmin (4) and dihydrochlorodesmin (5), each containing 3 enol acetate groups, have been isolated from Great Barrier Reef collections of the green algaChlorodesmis fastigiata (Chlorophyta, Caulerpales). Didehydrotrifarin (3) was also characterized.

C18terpenoid metabolites of the brown algaCystophora moniliformis

Ten new terpenoid compounds have been isolated from the brown alga Cystophora moniliformis. Their isolation and structural elucidation, mainly on spectral evidence, is discussed, together with data on four previously reported compounds.

Five new C26tetracyclic terpenes from a sponge (Lendenfeldiasp.)

Five new scalarane sesterterpenes have been isolated from a Western Australian sponge (Lendenfeldia sp.). As with earlier reported examples of these compounds, several of these metabolites of this sponge are extremely potent inhibitors of platelet aggregation.

Two derivatives of farnesylacetone from the brown algaCystophora moniliformis

Farnesylacetone epoxide (3) and the isomeric diketone (4) have been isolated from the brown algaCystophora moniliformis.

Two cembranes fromCespitulariaspecies (soft coral)

Two new cembranolides, (1R,2S,3E,7R,8R,11E,14S)-7,8-epoxy-14-hydroxycembra-3,11,15-trien-17,2-olide and (lR,2R,3E,7R,SR,11E,14R)-7,8-epoxy-14-hydroxycembra-3,11,15-trien-17,2-olide, have been isolated from separate species of Cespitularia (soft coral).

Use of 13C spin-lattice relaxation measurements to determine the structure of a tetrabromo diphenyl ether from the sponge Dysidea herbacea

Abstract The structure of a novel tetrabromodiphenyl ether from D . herbacea is solved principally by analysis of the contributions of non-bonded hydrogens to the spin-lattice relaxation times of quaternary carbons.

Furodendin, a C22 degraded terpene from the spongePhyllospongia dendyi

The structure of furodendin (5), a minor secondary metabolite of the spongePhyllospongia dendyi, has been solved by spectral methods. Furodendin is probably derived, biosynthetically, by elimination of a C3 unit from a C25 geranyl-farnesol precursor.

Taonianone, a new diterpene from the brown alga Taonia australasica

Abstract Taonianone, a diterpene with a novel carbocyclic ring system has been isolated from the brown alga Taonia australasica .