Cholinergic Agents: Effect of Methyl Substitution in a Series of Arecoline Derivatives on Binding to Muscarinic Acetylcholine Receptors
作者:Walter H. Moos、Stephen C. Bergmeier、Linda L. Coughenour、Robert E. Davis、Fred M. Hershenson、Jeffrey A. Kester、James S. McKee、John G. Marriott、Roy D. Schwarz、Haile Tecle、Anthony J. Thomas
DOI:10.1002/jps.2600811012
日期:1992.10
Arecoline, arecaidine, and a series of derivatives, differing by the presence or absence of methyl groups at positions on the periphery of the molecule, were prepared, and their binding to muscarinicacetylcholinereceptors was tested. On the basis of this study, muscarinic agonism for arecolineseries is governed by strict structure-activity relationships, as previously observed for other agonist
Enantioselective Synthesis of Dihydropyridines Containing Quaternary Stereocenters Through Dearomatization of Pyridinium Salts
作者:Donovan J. Robinson、Sean P. Spurlin、John D. Gorden、Rashad R. Karimov
DOI:10.1021/acscatal.9b03874
日期:2020.1.3
a fully substituted stereogenic center is a challenging synthetic problem. We describe a strategy toward this problem involving dearomatization of N-alkylpyridinium salts using boronic acid nucleophiles. This dearomatization reaction is catalyzed by a rhodium(I)/BINAP catalytic system and delivers dihydropyridines that contain a fully substituted stereogenic center alpha to the ring nitrogen atom in