Sterols. LXXXIII. Oxidation Products of Sarsasapogenin. Studies on the C<sub>22</sub> Lactone
作者:Russell E. Marker、Ewald Rohrmann
DOI:10.1021/ja01858a018
日期:1940.1
Synthesis of “glycospirostanes” via ring-closing metathesis
作者:Dorota Czajkowska、Jacek W. Morzycki、Rosa Santillan、Leszek Siergiejczyk
DOI:10.1016/j.steroids.2009.09.001
日期:2009.11
Syntheses of "glycospirostanes" from 3 beta-hydroxy-23,24-dinor-5 alpha-cholano-22,16-lactone and 3 alpha-hydroxy-23,24-dinor-5 beta- -cholano-22,16-lactone were performed. The key step of these syntheses was ring-closing metathesis of the corresponding C,O-diallyl derivative. Further elaboration of the six-membered ring F consisted of allylic hydroxylation with SeO(2) followed by OsO(4) dihydroxylation of the C24-C25 double bond. The obtained final products proved to be simultaneously O- and C-L-arabinopyranosides. (C) 2009 Elsevier Inc. All rights reserved.