Asymmetric Synthesis of 1,3-Dioxolanes by Organocatalytic Formal [3 + 2] Cycloaddition via Hemiacetal Intermediates
作者:Keisuke Asano、Seijiro Matsubara
DOI:10.1021/ol3003755
日期:2012.3.16
A novel asymmetricformal [3 + 2] cycloaddition reaction for the synthesis of 1,3-dioxolanes using cinchona-alkaloid-thiourea-based bifunctional organocatalysts is reported. The reaction proceeds via the formation of hemiacetal intermediates between γ-hydroxy-α,β-unsaturated ketones and aldehydes.
Formaldehyde was utilized as an oxygen-centered nucleophile in an asymmetric oxy-Michael addition to gamma-hydroxy-alpha,beta-unsaturated carbonyl compounds using bifunctional organocatalysts through hemiacetal intermediates. The cyclic acetal product could be further transformed into beta-hydroxycarbonyl compounds, useful synthetic intermediates leading to various important target molecules. As such, this method is an example of a novel formal asymmetric hydration of alpha,beta-unsaturated carbonyl compounds.