Untersuchungen über asymmetrische Synthesen III. Über die Anwendung der asymmetrischen Synthese zur Konfigurationsbestimmung bei Triterpenen und Steroiden
作者:W. G. Dauben、D. F. Dickel、O. Jeger、V. Prelog
DOI:10.1002/hlca.19530360142
日期:——
angeführten Triterpene und Steroide die Konfigurationen I–III und XII–XV abgeleitet. Daraus folgt, dass die erwähnten Triterpene und Steroide mit 30 Kohlenstoffatomen die gleiche Konfiguration und Konstellation im Ringe A besitzen, wie die Abkömmlinge des Cholestanols-(3β), dessen absolute Konfiguration mit Hilfe der asymmetrischen Synthese indirekt bestimmt wurde.
A long-range intramolecular functionalization by alkoxyl radicals: a long-range intramolecular hydroxylation of C(25) of cholestane side chain
作者:Kazuhiko Orito、Shinji Satoh、Hiroshi Suginome
DOI:10.1039/c39890001829
日期:——
Alkoxylradicals generated by the irradiation of hypoiodites of 5α-chlolestan-7α-yl-4-(hydroxyphenylmethyl)-phenylacetates and 5α-cholestan-7α-yl-3-[4-(hydroxyphenylmethyl)phenyl] propionates, respectively, abstracted a hydrogen from the remote C(25) of their cholestanesidechain to give novel macrocyclic ether lactones which gave 5α-cholestane-7α, 25-diol by reduction with Na and liquid ammonia in
Hydroxy-steroids. Part IV. The preparation and spectra of steroid olefins
作者:G. M. L. Cragg、C. W. Davey、D. N. Hall、G. D. Meakins、E. E. Richards、T. L. Whateley
DOI:10.1039/j39660001266
日期:——
Convenient preparations have been developed for a series of steroidal mono-olefins free from oxygenated substituents: this Series includes representatives of all but one of the possible endocyclic olefins. The infrared, nuclear magnetic resonance, and ultraviolet spectra of the compounds were examined with particular attention to the relative power and scope of the different techniques in structural