title: A general organocatalyst for direct alpha-functionalization of aldehydes: stereoselective C-C, C-N, C-F, C-Br, and C-S bond-forming reactions. Scope and mechanistic insights.
abstract: The development of a general organocatalyst for the alpha-functionalization of aldehydes, via an enamine intermediate, is presented. Based on optically active alpha,alpha-diarylprolinol silyl ethers, the scope and applications of this catalyst for the stereogenic formation of C-C, C-N, C-F, C-Br, and C-S bonds are outlined. The reactions all proceed in good to high yields and with excellent enantioselectivities. Furthermore, we will present mechanistic insight into the reaction course applying nonlinear effect studies, kinetic resolution, and computational investigations leading to an understanding of the properties of the alpha,alpha-diarylprolinol silyl ether catalysts.
authors.affiliation: The Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Johan
authors.initials: J
authors.lastname: Franzén
authors.forename: Mauro
authors.initials: M
authors.lastname: Marigo
authors.forename: Doris
authors.initials: D
authors.lastname: Fielenbach
authors.forename: Tobias C
authors.initials: TC
authors.lastname: Wabnitz
authors.forename: Anne
authors.initials: A
authors.lastname: Kjaersgaard
authors.forename: Karl Anker
authors.initials: KA
authors.lastname: Jørgensen