Influence of the 6-trimethylsilyl group on the fragmentation of the trimethylsilyl derivatives of some 6-hydroxy- and 3,6-dihydroxy-steroids and related compounds
作者:David J. Harvey、Paul Vouros
DOI:10.1002/bms.1200060402
日期:1979.4
The 25 eV mass spectra of the trimethylsilyl derivatives of a number of 6-hydroxy and 3,6-dihydroxy steroids together with deuterium and 18O-labeled analogs have been examined to determine the influence of the 6-OTMS group on fragmentation patterns. Ions in the cholestane series at m/z 321 and 403 were the most characteristic ions derived from the 6-OTMS function; their relative abundances, although
已经研究了许多6-羟基和3,6-二羟基甾族化合物的三甲基甲硅烷基衍生物与氘和18O标记的类似物的25 eV质谱,以确定6-OTMS基团对断裂模式的影响。胆甾烷系列中m / z 321和403处的离子是源自6-OTMS功能的最具特征性的离子。它们的相对丰度,尽管6-OTMS类固醇本身的光谱较低,但是当存在3-OTMS或3-氧代基团时,它们的相对丰度大大提高。在雄烷和孕烷衍生物的光谱中也存在类似的离子。这些离子的丰度与C3,C5或C6的立体化学之间没有相关性。讨论了碎裂机理和气相色谱数据。
Reactivity of Steroidal Dienes towards the Methyltrioxorhenium/H2O2−Urea Oxidation System: Isolation and Characterization of New Oxygenated Steroids
作者:Donato Sica、Domenica Musumeci、Franco Zollo、Simona De Marino
solvents, and in the presence of pyridine as ligand. Three new 4,5-epoxy-3,6-dihydroxyl compounds 10, 11, and 12 were isolated from the treatment of diene 4 in CHCl3 at 0 °C, while oxidations of the Δ7,9(11)-diene steroid 13 allowed us to isolate the new monoepoxy and diepoxy steroids 14 and 15 and the new triol 19. The structures of all newsteroids were verified on the basis of chemical evidence and interpretation
A MULTIGRAM PREPARATIVE SYNTHESIS OF CHOLEST-4-EN-3α,6β- AND -3α,6α-DIOLS
作者:Kejun Zhao、Yongfeng Wang、David C. Billington
DOI:10.1081/scc-100105387
日期:2001.1.1
A preparative synthesis of cholest-4-en-3 alpha ,6 beta- and -3 alpha ,6 beta -diols 10 and 15 using cheap reagents and simple working-up procedures without chromatography on a multigram scale is described.
19-nor-5β-Methyl-steroide, III. Die Acetolyse von 3-Methoxy-steroiden
作者:Günther Snatzke
DOI:10.1002/jlac.19656860120
日期:1965.7.15
y-Δ4-cholesten (III), 3β.6β-Diacetoxy-Δ4-cholesten (V) und dessen 3α-Epimeres (IVb) identifiziert werden. IV b und V entstehen durch Acetolyse aus dem 3β-Methoxy-Derivat III. Das 6-Monoacetat (VIc) des 5α-Cholestan-3α.5.6β-triols liefert mit SOCl2 ein cyclisches Sulfit VII, das 3-Monoacetat VId das entsprechende 5α.6α-Epoxyd IXb. Die Acetolyse gesättigter und ungesättigter 3β- und 3α-Methoxy-steroide
Studies on stereocontrolled epoxidations of bis-alicyclic alcohols in steroidal skeletons: preparation of eight diastereomerically pure epoxides from cholest-4-en-3β,6β-; -3β,6α-; -3α,6β- and -3α,6α-diols
作者:Kejun Zhao、Yongfeng Wang、David C. Billington
DOI:10.1016/s0957-4166(01)00174-4
日期:2001.5
Eight diastereomericallypure epoxides have been prepared from cholest-4-en-3β,6β; -3β,6α-; -3α,6β- and -3α,6α-diols via a combination of steric, protecting group and oxidant effects on stereocontrolled epoxidations of a bis-alicyclic alcohol system within the steroidal skeleton.