Ethyl 6-Bromo-3indolcarboxylate and 3-Hydroxyacetal-6-bromoindole, novel bromoindoles from the sponge Pleroma menoui of the Coral Sea

L'éponge #Plemora menoui (Démosponge, #O. Lithistida, ss. #O. Trienosina, #Desmophorina, Fam. #Pleromidae$) récoltée à une profondeur de 500 m dans la Mer de Corail, au sud-est de Nouméa contient deux nouveaux alcaloïdes : ethyl 6-bromo-3-indolcarboxylate and 3-hydroxyacétal-6-bromoindole. (Résumé d'auteur

HIGHLY HYDROXYLATED MARINE STEROIDS FROM THE STARFISH ARCHASTER-TYPICUS

Seven new marine polyhydroxysteroids [I, R1 = R2 = H, OH; R3 = R4 = H, SO3H; R5 = CH2COEt, CH:C(Me)CH2OH, CH2CH(OH)Et] of which 4 have a 27-norcholestane skeleton, were isolated by droplet counter-current chromatog. and reversed-phase HPLC from A. typicus. Characterization was accomplished by fast-atom bombardment mass spectrometry and 1H and 13C NMR spectroscopy including 2-dimensional H-C chem.-shift correlation (direct and long range) NMR spectroscopy

STARFISH SAPONINS .25. STEROIDAL GLYCOSIDES FROM THE STARFISH GOMOPHIA-WATSONI

Two novel steroidal glycosides, gomophiosides A (I) and B (II) were isolated from G. watsoni along with balityloside F and 2 polyhydroxysteroids ((24S)-5α-cholestane-3β,6α,8,15β,24-pentol and (24S)-5α-cholestane-3β,4β,6α,8,15β,2-hexol). The structures of the new metabolites were detd. on the basis of spectral data

STARFISH SAPONINS .28. STEROIDAL GLYCOSIDES FROM PACIFIC STARFISHES OF THE GENUS NARDOA

A review, with 5 refs., of the authors' recent work on the isolation of steroid glycosides from starfish of the genus Nardoa