THE CONSTITUENTS OF MARINE SPONGES .6. DITERPENOID METABOLITES OF THENEW-ZEALAND SPONGE CHELONAPLYSILLA-VIOLACEA

The sponge Chelonaplysilla violacea, collected from New Zealand coasta l waters, contains as major constituents the diterpenoids aplyviolene (1a), norrisolide (2), dendrillolide A (3) aplyroseol-7 (4), spongian- 16-one (5), chelonaplysin C (6), and a series of new compounds chelovi olene A-F and cheloviolin. Structures were assigned to cheloviolene A (7), oazulen-1-yl)tetrahydrofuro[2,3-b]furan-2(3H)-one, cheloviolene B (8), oazulen-1-yl)tetrahydrofuro[2,3-b]furan-2(3H)-one, cheloviolene C (9), 1H-inden-1-yl)prop-2'-enyl]dihydrofuran-2(3H)-one, cheloviolene D (10), methyl enedecahydroazulen-1-yl)tetrahydrofuran-3-acetate, che loviolene E (11), methyl o-1H-inden-1-yl)ethenyl]tetrahydrofuran-3-ace tate, and cheloviolene F (12), enedecahydroazulen-1-yl)tetrahydro-2H-p yran-2-one, by using spectroscopic methods; the structure (13) was ded uced for cheloviolin, thalen-1a,yl)-2,7-dioxabicyclo-[3.2.1]octan-3-on e.