Diastereo- and Enantioselective Direct Catalytic Aldol Reaction of 2-Hydroxyacetophenones with Aldehydes Promoted by a Heteropolymetallic Complex: Catalytic Asymmetric Synthesis of <i>a</i><i>nti</i>-1,2-Diols
anti-selective directcatalyticasymmetricaldolreaction of 2-hydroxyacetophenones with aldehydes is described. The reaction is catalyzed by a heteropolymetallic complex to afford anti-alpha,beta-dihydroxy ketones as the major diastereomer with excellent enantioselectivity. The use of 2-hydroxyacetophenones bearing electron-donating groups at the phenyl moiety enabled efficient transformation of the aldol products
Indium(I) bromide-promoted stereoselective preparation of (E)-α,β-unsaturated ketones via sequential intermolecular aldol-type coupling/elimination reactions of α,α-dichloroketones with aldehydes
作者:Clovis Peppe、Rafael Pavão das Chagas
DOI:10.1016/j.jorganchem.2006.09.046
日期:2006.12
Indium(I) bromide promotes the reaction of α,α-dichloroketones with aldehydes to produce (E)-α,β-unsaturated ketones, exclusively. The transformation occurs via two sequential reactions, an aldol-type coupling between the two carbonylic reagents followed by an elimination process.