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Year 2005, Month 5 (Section Full Articles, Page 1266)

Structures of new polar steroids from the Far-Eastern starfish Ctenodiscus crispatus*

A. A. Kicha,* N. V. Ivanchina, A. I. Kalinovsky, P. S. Dmitrenok, and V. A. Stonik

A fraction of sulfated polyhydroxylated steroids from the Far-Eastern starfish Ctenodiscus crispatus was investigated. The main component of this fraction was identified as (22E,24R,25R)- 24-methyl-5α-cholest-22-en-3β,5,6β,15α,25,26-hexol 26-O-sulfate. For the compound stere- oisomeric with respect to the side chain, the (24R,25S) or (24S,25R) relative configurations were assigned to the C(24) and C(25) chiral centers. The structures of two other compounds isolated from the fraction were identified as (22E,24ξ)-26,27-bisnor-24-methyl-5α-cholest- 22-en-3β,5,6β,15α,25-pentol 25-O-sulfate and (22E,24ξ,25ξ)-24-methyl-5α-cholest-22-en- 3β,5,6β,8,15α,25,26-heptol 26-O-sulfate.

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