We report here an operationally simple protocol for the direct aromatic perfluoroalkylation and trifluoromethylation of α‐cyano arylacetates. This metal‐free approach, which occurs at ambient temperature and under visible‐light irradiation, is driven by the photochemical activity of electron donor–acceptor (EDA) complexes, formed in situ by the interaction of transiently generated enolates and perfluoroalkyl
Enantioselective Organocatalytic Michael Addition of α-Substituted Cyanoacetates to α,β-Unsaturated Selenones
作者:Francesca Marini、Silvia Sternativo、Francesca Del Verme、Lorenzo Testaferri、Marcello Tiecco
DOI:10.1002/adsc.200800592
日期:2009.1
A novel enantioselective (up to 90% ee) Michaeladdition of α-substitutedcyanoacetates to α,β-unsaturatedselenones in the presence of bifunctional urea and thiourea organocatalysts is described. The Michael adducts, containing an all-carbon quaternary stereocenter, are smoothly converted into synthetically useful polyfunctional compounds by taking advantage of the excellent leaving group ability