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L. Czollner, B. Kaelz, S. Welzig, W. Frantsits, U. Jordis, J. Fröhlich:
"Preparation of N-alkylgalanthamines and related compounds for the treatment of central nervous system diseases";
Patent: PCT Int. Appl., No. WO2005030333; submitted: 09-09-2004, granted: 04-07-2005.

Title compds. I [R1, R2 = H, OH; X = H, Br; Z = CH2CCH; CH2C(CH2)CH3, CO(CH2)nCl, etc.; n = 0-6] and their pharmaceutically acceptable salts were prepd. For example, 4-bromobenzyl bromide N-alkylation of (-)-norgalanthamine, afforded alkylgalanthamine II in 70% yield. In acetylcholinesterase inhibition assays, 60-examples of compds. I exhibited IC50 values ranging from 0.016->100 mM, e.g., the IC50 value of alkylgalanthamine II was 0.016 mM. Compds. I are claimed to be useful for the treatment of Alzheimer's disease.