Résumés Anglais Français Direct C(3) alkenylation of non-aromatic enamides through palladium(II)-catalyzed Fujiwara–Moritani cross-coupling was developed. The reaction scope includes a range of cyclic enamides as well as activated alkenes. The utility of this methodology is illustrated by the synthesis of octa- or tetrahydroquinoline cores obtained from conjugated enamides via Diels–Alder cycloaddition. L’alcénylation directe en C(3) d’énamides non aromatiques a été développée selon le couplage croisé catalysé par le palladium(II) décrit par Fujiwara–Moritani. Le potentiel de cette réaction s’étend sur une large gamme d’énamides cycliques ainsi que différents alcènes activés. L’intérêt de cette méthodologie est illustrée par la synthèse de noyaux octa- ou tétrahydroquinoléine via une réaction de cycloaddition de Diels–Alder à partir d’énamides conjugués précédemment obtenus.
An efficient copper-catalyzed method for the regioselective synthesis of β-difluoroester substituted enamides using BrCF2CO2Et is reported for the first time.
Palladium(II)-Catalyzed Direct Alkenylation of Nonaromatic Enamides
作者:Nicolas Gigant、Isabelle Gillaizeau
DOI:10.1021/ol301249n
日期:2012.7.6
A mild and efficient method for the direct alkenylation of nonaromatic enamides was achieved through a palladium(II)-catalyzed C-H funclionalization. The reaction scope includes cyclic and acyclic enamides and a range of activated alkenes. This approach represents the first successful direct C(3)-functionalization of nonaromatic cyclic enamides.
β-C(sp<sup>2</sup>)–H alkylation of enamides using xanthate chemistry
Access to the γ-amino-β,γ-unsaturated acyl scaffold was established by applying xanthate chemistry to enamides. This original β-C(sp2)–H alkylation is regioselective and exhibits broad substrate scope and good functional group tolerance. The large availability of xanthates is advantageous to the scope of the reaction which combines a radical process and a polar reaction.