Abstract
Five new steroidal monoglycosides, kurilensosides E ( 1), F ( 2), G ( 3), H ( 4) and 15- O-sulfate of echinasteroside C ( 5) were isolated along with the previously known echinasteroside C ( 6) from the alcoholic extract of the Far Eastern starfish Hippasteria kurilensis collected near Kuril Islands. Compounds 1– 3 were determined to contain unusual polyhydroxysteroidal aglycons lacking 6-hydroxy group. Aglycon moiety of kurilensoside H ( 4) was shown to be the first case of marine polar steroids containing 4,5-epoxy functionality. Hypothetic pathways of the biosynthesis of polyhydroxysteroids and related glycosides in starfish and the existence of the late C-6 oxidation pathway in H. kurilensis are discussed.
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