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(24R and 24S)-5β-cholestane-3α,7α,24,25-tetrols were prepared by osmium tetroxide oxidation of 5β-cholest-24-ene-3α,7α-diol. The resulting diastereomeric tetrols were separated by thin-layer chromatography, their purity ascertained by melting point, gas-liquid chromatography and mass spectra and their structural configurations were assigned by molecular rotation measurement and circular dichroism studies. In a similar fashion, the (24R and 24S)-5β-cholestane-3α,24, 25-triols were prepared and their structures identified. 相似文献
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Some intramolecular cyclisation reactions of bile acid derivatives have been studied. Photolysis of the N-iodo derivative of 5β-cholan-24-amide leads to the formation of the epimeric 5β-cholao24, 20?-lactones. The N-iodo derivative of 3α-acetoxy-5β-cholan-24-amide reacts similarly. Reaction of 3α-acetoxy-5β-cholan-24-ol with lead tetra-acetate and iodine gives the two 3α-acetoxy-20?, 24-oxido-5β-cholanes, two 3α-acetoxy-22e-iodo-20?,24-oxido-5β-cholanes, and the two 3α-acetoxy-21-iodo-20?,24-oxido-5β-cholanes. The two 3α-acetoxy-20?, 24-oxido-5β-cholanes are also obtained when 3d-acetoxy-5β-cholan-24-ol reacts with silver oxide and bromine. 相似文献
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Subject Index
Subject Index for Neurochemical Research, Volume 24, 1999 相似文献10.
Authors Index
Author Index for Neurochemical Research, Volume 24, 1999 相似文献11.
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Posner GH Crawford KR Yang HW Kahraman M Jeon HB Li H Lee JK Suh BC Hatcher MA Labonte T Usera A Dolan PM Kensler TW Peleg S Jones G Zhang A Korczak B Saha U Chuang SS 《The Journal of steroid biochemistry and molecular biology》2004,(1-5):5-12
The new 24-phenylsulfone 4a, a low-calcemic analog of the natural hormone 1alpha,25-dihydroxyvitamin D(3), is a potent (IC(50) = 28nM) and highly selective inhibitor of the human 24-hydroxylase enzyme CYP24. 相似文献
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