This invention relates to a method for N-demethylating an N-methyl morphinane comprising the steps of: (i) treating said N-methyl morphinane with an oxidizing agent to form the N-oxide morphinane; and (ii) treating said N-oxide morphinane with a reducing agent. This invention also relates to a method for oxidizing a &Dgr;
7
-morphinane compound to a &Dgr;
6
, &Dgr;
8
-morphinane compound, comprising the steps of treating said &Dgr;
7
-morphinane with &ggr;-MnO
2
for a time and under conditions sufficient to oxidize said &Dgr;
7
morphinane, and treating the &ggr;-MnO
2
with glycol or a derivative thereof, and/or an inorganic salt.
This invention relates to a method for N-demethylating an N-methyl morphinane comprising the steps of: (i) treating said N-methyl morphinane with an oxidising agent to form the N-oxide morphinane; and (ii) treating said N-oxide morphinane with a reducing agent. This invention also relates to a method for oxidising a Δ7-morphinane compound to a Δ?6, Δ8¿-morphinane compound, comprising the steps of treating said Δ7-morphinane with η-MnO¿2? for a time and under conditions sufficient to oxidise said Δ?7¿morphinane, and treating the η-MnO¿2? with glycol or a derivative thereof, and/or an inorganic salt.
Further investigation of the N-demethylation of tertiary amine alkaloids using the non-classical Polonovski reaction
作者:Shanti Thavaneswaran、Peter J. Scammells
DOI:10.1016/j.bmcl.2006.03.017
日期:2006.6
iron salt-mediated Polonovski reaction efficiently N-demethylates certain opiate alkaloids. In this process, the use of the hydrochloride salt of the tertiary N-methyl amine oxide was reported to give better yields of the desired N-demethylated product. Herein, we report further investigation into the use of N-oxide salts in the iron salt-mediated Polonovski reaction. An efficient approach for the
Efficient N-Demethylation of Opiate Alkaloids Using a Modified Nonclassical Polonovski Reaction
作者:Kristy McCamley、Justin A. Ripper、Robert D. Singer、Peter J. Scammells
DOI:10.1021/jo035243z
日期:2003.12.1
A modified Polonovskireaction has been employed to N-demethylate several opiate alkaloids in moderate to high yield. This method provides an alternative to traditional N-demethylation procedures which utilize toxic reagents such as cyanogen bromide or expensive reagents such as vinyl chloroformate. The current synthesis involves N-oxide formation, isolation of the corresponding N-oxide hydrochloride