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 alkylation
作者:T.N. Makarieva、L.K. Shubina、A.I. Kalinovsky、V.A. Stonik、G.B. Elyakov
DOI:10.1016/0039-128x(83)90039-9
日期:1983.9
alpha-triol (sokotrasterol sulfate) has been isolated from the sponge Halichondriidae gen. sp., 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-3
从海绵Halichondriidae基因中分离出了24、25、26、26-四甲基-5α-胆甾-23E-ene-2α,3β,6α-三醇的三硫酸盐衍生物。,收集在索科特拉岛(阿拉伯海)附近,其结构已经阐明。新类固醇的侧链涉及C-24处的“正常”烷基化以及C-26处两个额外的甲基和C-25处一个额外的甲基的前所未有的添加。游离固醇部分仅包含24-异丙基-5-胆甾烯-3β-醇和24-异丙基-5、22E-胆甾烯-3-3β-醇。在马达加斯加海绵Halichondria sp。中已检测到24-异丙基-5、22E-胆甾二烯-3β-醇是唯一的单羟基甾醇,而硫酸halistanol是主要的多羟基化甾体衍生物。