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
Equilibration of the 7 alpha-->7 beta isomers of 7-substituted 6,14-ethenomorphinanes has been accomplished, for the first time, in dipolar aprotic solvents by the application of bases with weak nucleophilic character. Transformation of the 7 beta-nitrile with phenylmagnesium bromide led to a new type of 6,6 '-dimeric compound.