Perchloric acid induced epimerisation of the thevinones: an improved synthesis of 7β-dihydrothevinones
作者:Ian Derrick、Andrew Coop、Sali M Al-Mousawi、Stephen M Husbands、John W Lewis
DOI:10.1016/s0040-4039(00)01300-9
日期:2000.9
The region above and away from C7 in the orvinols is known to be of particular importance in determining the μ-opioid receptor profile of this important class of opioids. However it has been difficult to explore this site due to the relative inaccessibility of 7β-substituted compounds. Here we report that perchloric acid induced epimerisation of the 7α-ketones (dihydrothevinones) allows considerably
Methylation of the enolates of thevinone and some analogues
作者:Andrew Coop、Konstantinos Grivas、Stephen Husbands、John W. Lewis
DOI:10.1016/0040-4020(95)00553-k
日期:1995.8
Branching has been introduced into various thevinone analogues by utilisation of both kinetic and thermodynamic enolates. No rearrangement was observed in the systems under study.
NMR Spectra and Stereochemistry of some 7-Substituted 6,14-Bridged Thebaine Derivatives
作者:Barrie C. Uff、Angela S. Mallard、John A. Davis、Ray Henson
DOI:10.1002/mrc.1260230610
日期:1985.6
The NMR spectra of eighteen 7α‐ and 7β‐substituted 6,14‐bridged thebaine derivatives are reported and the steric and other effects of the 7‐substituent on the C‐5‐H atoms examined. Although the H‐5 proton shift enabled compounds epimeric at C‐7 to be distinguished in the examples studied (values falling between δ 4.75‐4.40 ppm in the 7α series and δ 5.21‐4.97 ppm in the 7β series), the C‐5 shift values