Influence of the Reaction Conditions on the Evolution of the Michael Addition of β-Keto Sulfones to α,β-Unsaturated Aldehydes
作者:José Alemán、Vanesa Marcos、Leyre Marzo、José Luis García Ruano
DOI:10.1002/ejoc.201000502
日期:——
studied the influence of different reactionconditions on the conjugated addition of β-keto sulfones to α,β-unsaturated aldehydes catalyzed by silyl prolinol ethers. Small changes in the starting material and/or in the experimental protocol are able to produce significant variations in the structures of the final products. The high chemical versatility of the resulting Michael adducts make possible their
Asymmetric Organocatalytic Formal Alkynylation and Alkenylation of α,β-Unsaturated Aldehydes
作者:Martin Nielsen、Christian Borch Jacobsen、Márcio W. Paixão、Nicole Holub、Karl Anker Jørgensen
DOI:10.1021/ja903920j
日期:2009.8.5
stereoselective organocatalytic one-pot protocol for the formal alkynylation and alkenylation of alpha,beta-unsaturated aldehydes using novel chemistry based on beta-keto heterocyclic sulfones is presented. The organocatalytic step is catalyzed by a prolinol derivative and allows for the formation of important optically active compounds. Further transformations of the beta-keto heterocyclic sulfone moiety,