Synthesis and anticholinesterase activity of (-)-N1-norphysostigmine, (-)-eseramine, and other N1-substituted analogs of (-)-physostigmine
- 1 December 1988
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Medicinal Chemistry
- Vol. 31 (12) , 2297-2300
- https://doi.org/10.1021/jm00120a008
Abstract
(-)-N1-Benzylnorphysostigmine (4), prepared from synthetic (-)-O-methyl-N1-noreseroline (1) by N-benzylation, ether cleavage, and reaction of (-)-N1-benzylnoreseroline (3) with methyl isocyanate, was the intermediate used to prepare the title compounds. Catalytic debenzylation of 4 afforded (-)-N1-norphysostigmine (5), and (-)-eseramine (6) was obtained by reaction of 5 with methyl isocyanate. Reductive N-methylation of 5 gave (-)-physostigmine (9) while reaction of 5 with allyl bromide and phenethyl bromide afforded carbamates 7 and 8, respectively. Data on the in vitro potencies (IC50) and activities of certain of these compounds (4-8) as inhibitors of electric eel acetyl cholinesterase are reported. (-)-N1-Norphysostigmine (5) was found to be similarly potent against AChE as (-)-physostigmine (9).Keywords
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