174740-81-9Relevant articles and documents
Methods for producing N-protected-azetidine-2-carboxylic acids
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, (2008/06/13)
There is disclosed a method for producing an essentially enantiomerically pure N-protected-azetidine-2-carboxylic acid of formula (1): which method is characterized by: subjecting a crude enantiomerically excess N-protected-azetidine-2-carboxylic acid comprising said enantiomer represented by formula (1) in excess to the other enantiomer thereof to crystallization in an organic solvent selected from aromatic hydrocarbon, aliphatic ether, aliphatic alcohol, aliphatic ketone, aliphatic nitrile, aliphatic amide, aliphatic sulfoxide, aliphatic ester and a mixed solvent thereof, wherein R is: an optionally substituted alkyl, alicyclic or alicyclicalkyl group, an optionally substituted alkenyl group, an optionally substituted aryl group, an optionally substituted heteroaryl group, or a dialkylamino group, and absolute configuration of the asterisked asymmetric carbon atom is S or R.
Novel 3-pyridyl ethers with subnanomolar affinity for central neuronal nicotinic acetylcholine receptors
Abreo, Melwyn A.,Lin, Nan-Horng,Garvey, David S.,Gunn, David E.,Hettinger, Ann-Marie,Wasicak, James T.,Pavlik, Patricia A.,Martin, Yvonne C.,Donnelly-Roberts, Diana L.,Anderson, David J.,Sullivan, James P.,Williams, Michael,Arneric, Stephen P.,Holladay, Mark W.
, p. 817 - 825 (2007/10/03)
Recent evidence indicating the therapeutic potential of cholinergic channel modulators for the treatment of central nervous system (CNS) disorders as well as the diversity of brain neuronal nicotinic acetylcholine receptors (nAChRs) have suggested an opportunity to develop subtype-selective nAChR ligands for the treatment of specific CNS disorders with reduced side effect liabilities. We report a novel series of 3-pyridyl ether compounds which possess subnanomolar affinity for brain nAChRs and differentially activate subtypes of neuronal nAChRs. The synthesis and structure-activity relationships for the leading members of the series are described, including A-85380 (4a), which possesses ca. 50 pM affinity for rat brain [3H]-(- )cytisine binding sites and 163% efficacy compared to nicotine to stimulate ion flux at human α4β2 nAChR subtype, and A-84543 (2a), which exhibits 84- fold selectivity to stimulate ion flux at human α4β2 nAChR subtype compared to human ganglionic type nAChRs. Computational studies indicate that a reasonable superposition of a low energy conformer of 4a with (S)-nicotine and (-)-epibatidine can be achieved.
Enantioselective catalytic reductions of ketones with new four membered oxazaborolidines: Application to (S)-tetramisole
Rama Rao,Gurjar,Kaiwar
, p. 859 - 862 (2007/10/02)
Enantioselective catalytic reduction of ketones with both the enantiomers of new four membered oxazaborolidines is described.