Spatane diterpenoids from the brown alga Stoechospermum marginatum (Dictyotaceae)

摘要

Two spatane diterpenes, the new 5(R),16(S)-diacetoxyspata-13,17-diene and the known 5(R),16(S)-dihydroxyspata-13,17-diene have been isolated from the brown alga Stoechospermum marginatum. The structures were elucidated from chemical and spectroscopic evidence. The absolute stereochemistry was determined using the modified Mosher's method. The superior 1 superior 3C chemical shifts were totally assigned by extensive NMR experiments.