Steroids pregnane

Like the South Pacific, the South Atlantic also scarcely contributed to the diversity of natural products. Pregnane steroids from ascidians of the Argentine coast are the most unusual metabolites. 

Britton KT, McLeod S, Koob GF, et al Pregnane steroid alphaxolane attenuates anxiogenic behavioral effects of corticotropin releasing factor and stress. Pharmacol Biochem Behav 41 399-403, 1992... 

Stereoselective cis hydroformylation of double bonds in the pregnane steroid nucleus is achieved with cobalt carbonyls,0- 17. Similarly, several other hydroformylated steroid systems were prepared starting from unsaturated pregnane and androstane precursors189 or vinylated estrone systems191. 

The marine sponge Amphimedon compressa (= Haliclona rubens) is one of a number of marine invertebrates which has been shown to produce pregnane steroids [4, 65], The biosynthetic origin of pregnanes in higher animals has been studied extensively, and in such systems, pregnane... 

Various aspects of steroid biosynthesis were included in a Royal Society Symposium. The published proceedings and other reviews have dealt with cyclase enzymes,water-soluble steroids and triterpenoids, the involvement of a 14(15)- or 8(14)-double bond and its reductionin cholesterol biosynthesis, biosynthesis of sterols, steroid metabolism in insects, pregnane steroids, cardenolides, and bufadienolides. ... 

Gas-Liquid Chromatographic Techniques for the Estimation of Progesterone and Pregnane Steroids Clin. Chim. Acta 34(2) 215-221 (1971) CA 75 105877t... 

Wang, S.-K., Dai, C.-F., and Duh, C.-Y. (2006a) Cytotoxic pregnane steroids from the Formosan soft coral Stereonephthya crystalliana. J. Nat. Prod., 69,103-106. 

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