We report a general palladium-catalyzed β-arylation of Boc-piperidines, which yields a variety of valuable 3-arylpiperidines in a simple and direct manner. The β- vs. α-arylation selectivity was controlled by the ligand, with flexible biarylphosphines providing mainly the desired β-arylated products whereas more rigid biarylphosphines mainly furnished the more classical α-arylated products. The computed reaction mechanism (DFT), studied from the common α-palladated intermediate, indicated that the reductive elimination steps leading to the α- and β-arylated products are selectivity-determining. Moreover, the experimental trend obtained with different ligands was well reproduced by the calculations.
Catalytic Enantioselective Synthesis of 3-Piperidines from Arylboronic Acids and Pyridine
作者:Sourabh Mishra、Sedef Karabiyikoglu、Stephen P. Fletcher
DOI:10.1021/jacs.3c05044
日期:2023.7.5
cross-coupling approach to enantioenriched 3-piperidines from pyridine- and sp2-hybridized boronic acids. The key step involves a Rh-catalyzed asymmetric reductive Heck reaction of aryl, heteroaryl, or vinyl boronic acids and phenyl pyridine-1(2H)-carboxylate to provide 3-substituted tetrahydropyridines in high yield and excellent enantioselectivity with a wide functional group tolerance. A three-step
Resolved 3-(3-Hydroxyphenyl)-N-n-propylpiperidine and its analogs: central dopamine receptor activity
作者:Haakan Wikstroem、Domingo Sanchez、Per Lindberg、Uli Hacksell、Lars Erik Arvidsson、Anette M. Johnsson、Seth Olof Thorberg、J. Lars G. Nilsson、Kjell Svensson
DOI:10.1021/jm00374a016
日期:1984.8
Seven enantiomeric pairs of N-alkyl analogues of 3-(3-hydroxyphenyl)-N-n-propylpiperidine (3-PPP, 12) have been synthesized and evaluated pharmacologically (biochemistry and behavior) in order to examine their ability to interact with central dopamine (DA) receptors, particularly DA autoreceptors. In the R series it seems as if all compounds behave as classical DA receptor agonists with affinity and