Electrochemical <i>N</i>-demethylation of tropane alkaloids
作者:Ali Alipour Najmi、Zhangping Xiao、Rainer Bischoff、Frank J. Dekker、Hjalmar P. Permentier
DOI:10.1039/d0gc00851f
日期:——
synthesize noratropine in high yield and purity using a convenient liquid–liquid extraction method without any need for chromatographic purification. Mechanistic studies showed that the electrochemical N-demethylation proceeds by the formation of an iminium intermediate which is converted by water as the nucleophile. The optimized method was further applied to scopolamine, cocaine, benzatropine, homatropine
and tested for muscarinic receptor binding affinity using [3H]pirenzepine and [3H]oxotremorine M as ligands. They were also evaluated for agonistic activities in the guinea pig ileum assay. 2-Methoxy- 2,8-diazaspiro[4.5]decane-1,3-dione (1i) was found to be a relatively M1 selective agonist. It reversed CO2-induced impairment of passive avoidance response with long duration of action, but also displayed