Enantioselective total and formal syntheses of paroxetine (PAXIL) via phosphine-catalyzed enone α-arylation using arylbismuth(V) reagents: a regiochemical complement to Heck arylation
摘要:
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.
Enantiocontrolled Synthesis of Highly Functionalized Tropanes via [5 + 2] Cycloaddition to η<sup>3</sup>-Pyridinylmolybdenum π-Complexes
作者:Helena C. Malinakova、Lanny S. Liebeskind
DOI:10.1021/ol000288x
日期:2000.11.1
nonracemic eta(3)-pyridinyl scaffold participates in [5 + 2] cycloaddition with electron-deficient alkenes, an allene, and an alkyne to give eta(3)-allylmolybdenum bicyclic adducts. The adducts can be demetalated, providing a convergent route to highly functionalized tropanes. High enantiocontrol can be achieved throughout the cycloaddition and demetalation sequence.
Stereo- and Regiocontrolled Construction of Trisubstituted Piperidines Using a TpMo(CO)<sub>2</sub>(Dihydropyridine) Scaffold (Tp = Hydridotrispyrazolylborate)
作者:Alessandro F. Moretto、Lanny S. Liebeskind
DOI:10.1021/jo0007128
日期:2000.11.1
Cationic TpMo(CO)(2)(dihydropyridine) complexes (Tp = hydridotrispyrazolylborate), readily generated from 3-oxo-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester, represent scaffolds from which (by judicious choice of demetalation conditions) either 2,3,6- or 2,5,6-trisubstituted-1,2,3,6- tetrahydropyridines can be prepared in a regio- and stereodefined way.