An enantioselective nucleophilic addition of α,β-unsaturated trifluoromethylketones catalyzed by l-proline derivatives
作者:Dehui Zhang、Chengye Yuan
DOI:10.1016/j.tet.2007.12.035
日期:2008.3
unexpected enantioselective 1,2-aldol reaction of acetone with α,β-unsaturated trifluoromethylketone catalyzed by l-proline derivative was described. The absolute configuration of the resulting chiral product was assigned based on a single crystal X-ray diffraction analysis. Structure–reactivity study of this organocatalytic system was briefly discussed. A reaction mechanism was tentatively postulated
A novel N,N-dibenzyl diaminomethylenemalononitrile organocatalyst efficiently promotes asymmetric Henry reactions of trifluoromethyl enones with nitromethane, affording the corresponding highly functionalized products in high yields with excellent enantioselectivities (up to 90% ee).
A squaramide organocatalyst efficiently promoted the asymmetric Friedel–Crafts alkylation of α,β-unsaturated trifluoromethyl ketones with aromatic alcohols in a one-pot procedure, affording corresponding 6-trifluoromethyl-substituted 7,8-dihydrochromen-6-ol derivatives (up to 94% yield, 74% ee).
α,β-Unsaturated CF3-ketones via secondary amine salts-catalyzed aldol condensation of 1,1,1-trufluoroacetone with aromatic and heteroaromatic aldehydes
作者:Alexander V. Popov、Valentina A. Kobelevskaya、Nikolai I. Borodin、Sergey V. Zinchenko
DOI:10.1016/j.jfluchem.2023.110108
日期:2023.4
A facile and efficient approach to the synthesis of α,β-unsaturated CF3-ketones in moderate to excellent yields via the amine salt-catalyzed aldol condensation of aromatic and heteroaromatic aldehydes with trifluoroacetone has been developed.