Steroids in Porifera. II. Steroid derivatives from two sponges of the family Halichondriidae. Sokotrasterol sulfate, a marine steroid with a new pattern of side chain …

TN Makarieva, LK Shubina, AI Kalinovsky, VA Stonik…

Index: Makarieva; Shubina; Kalinovsky; Stonik; Elyakov Steroids, 1983 , vol. 42, # 3 p. 267 - 281

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Citation Number: 52

Abstract

A trisulfated derivative of 24,25,26,26-tetramethyl-5α -cholest-23E-ene-2β, 3α, 6α-triol(sokotrasterol sulfate) has been isolated from the sponge , collected near Sokotra Island(Arabian Sea), and its structure has been elucidated. The side chain of the new steroid involves a “normal” alkylation at C-24 and the unprecedented addition of two extra methyl groups at C-26 and one extra methyl group at C-25. A free sterol fraction contained only 24-isopropyl-5-cholesten-3β-ol and 24- ...