摘要:
Three new steroid sulfates-3-beta-hydroxy-5-alpha-cholestan-6-alpha-yl sulfate, 6-alpha-hydroxy-5-alpha-cholestan-3-beta-yl sulfate, and 5-alpha-cholestan-3-beta,6-alpha-diyl disulfate-were synthesized. For the syntheses of the key intermediates, 3-beta-hydroxy-5-alpha-cholestan-6-alpha-yl acetate and 6-alpha-hydroxy-5-alpha-cholestan-3-beta-yl acetate, selective protection of hydroxy groups in 5-alpha-cholestane-3-beta,6-alpha-diol was necessary. This problem was solved by using a combination of acetyl, tetrahydropyranyl, and methoxymethyl protective groups, which represents a new approach leading to these hydroxy acetates. Sulfated derivatives of 5-alpha-cholestane-3-beta,6-alpha-diol are present in marine invertebrates and were synthesized for the purposes of biologic testing.