Stereoselective Synthesis of α-Alkyl-β-keto Imides via Asymmetric Redox C−C Bond Formation between α-Alkyl-α-diazocarbonyl Compounds and Aldehydes
摘要:
Asymmetric redox C-C bond formation between alpha-alkyl-alpha-diazocarbonyl compounds and aldehydes was developed as a practical and general method for the construction of alpha-alkyl-beta-keto imides having a chiral nonracemic tertiary stereogenic center.
Homologation of Electron-Rich Benzyl Bromide Derivatives via Diazo C–C Bond Insertion
作者:Atanu Modak、Juan V. Alegre-Requena、Louis de Lescure、Kathryn J. Rynders、Robert S. Paton、Nicholas J. Race
DOI:10.1021/jacs.1c11503
日期:2022.1.12
The ability to manipulate C–C bonds for selective chemical transformations is challenging and represents a growing area of research. Here, we report a formal insertion of diazo compounds into the “unactivated” C–C bond of benzyl bromide derivativescatalyzed by a simple Lewisacid. The homologation reaction proceeds via the intermediacy of a phenonium ion, and the products contain benzylic quaternary
Despite the remarkable advances in catalytic asymmetricaziridinations over the past decades, establishing a general procedure for the stereoselective synthesis of trisubstituted aziridines has remained an elusive goal. Chiral N-triflyl phosphoramide-catalyzed reactions of N-α-diazoacyl oxazolidinones and N-Boc imines were developed as a solution to this unmet challenge.