Enantioselective total and formal syntheses of paroxetine (PAXIL) via phosphine-catalyzed enone α-arylation using arylbismuth(V) reagents: a regiochemical complement to Heck arylation
作者:Phillip K. Koech、Michael J. Krische
DOI:10.1016/j.tet.2006.05.092
日期:2006.11
Exposure of dihydropyridinone 1 to the arylbismuth(V) reagent (p-F-Ph)(3)BiCl2 in the presence of substoichiometric quantities of tributylphosphine (10 mol %) results in aryl transfer to the transiently generated (beta-phosphonio)enolate to provide the alpha-arylated enone 2. This transformation, which represents a regiochemical complement to the Mizoroki-Heck arylation, is used strategically in concise formal and enantioselective total syntheses of the blockbuster antidepressant (-)-paroxetine (PAXIL). (c) 2006 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis of Chiral Piperidines via the Stepwise Dearomatization/Borylation of Pyridines
作者:Koji Kubota、Yuta Watanabe、Keiichi Hayama、Hajime Ito
DOI:10.1021/jacs.6b01375
日期:2016.4.6
developed a novel approach for the synthesis of enantioenriched 3-boryl-tetrahydropyridines via the Cu(I)-catalyzed regio-, diastereo-, and enantioselective protoborylation of 1,2-dihydropyridines, which were obtained by the partial reduction of the pyridine derivatives. This dearomatization/enantioselective borylation stepwise strategy provides facile access to chiral piperidines together with the stereospecific