Combination of Metal-Catalyzed Cycloisomerizations and Biocatalysis in Aqueous Media: Asymmetric Construction of Chiral Alcohols, Lactones, and γ-Hydroxy-Carbonyl Compounds
作者:María J. Rodríguez-Álvarez、Nicolás Ríos-Lombardía、Sören Schumacher、David Pérez-Iglesias、Francisco Morís、Victorio Cadierno、Joaquín García-Álvarez、Javier González-Sabín
DOI:10.1021/acscatal.7b02183
日期:2017.11.3
The combination of the metal-catalyzed cycloisomerization of alkynes containing a tethered nucleophile as substituent in aqueousmedia (followed by the spontaneous hydrolysis, hydroalkoxylation, or aminolysis of the transiently formed five-membered heterocycles) with the subsequent enantioselective ketone bioreduction (mediated by KREDs) has been achieved. The overall transformations, which formally
Highly Efficient and Versatile Synthesis of Lactams and <i>N</i>-Heterocycles via Al(OTf)<sub>3</sub>-Catalyzed Cascade Cyclization and Ionic Hydrogenation Reactions
The discovery and development of an efficient and versatile method for the synthesis of N-substituted lactams is described. Pyrrolindinones, piperidones, and structurally related heterocycles were formed by Al(OTf)3-catalyzed cascade cyclization and ionic hydrogenation reactions of corresponding nitrogen substituted ketoamides in good yields.
Palladium-catalyzed selective hydrogenolysis of N-alkyl(aryl)-substituted γ-keto amides as an approach to γ-lactams or linear amides
作者:O. V. Turova、V. G. Berezhnaya、E. V. Starodubtseva、M. G. Vinogradov
DOI:10.1007/s11172-015-0978-3
日期:2015.5
A palladium-catalyzed hydrogenolysis of N-substituted γ-keto amides can proceed with participation of tautomeric 5-hydroxypyrrolidin-2-ones and give either pyrrolidin-2-ones, or linear amides, or their mixtures, depending on the substrate structure.