Enantioselective Synthesis of Substituted Indoles Through Zirconium(IV)-Catalyzed Friedel–Crafts Alkylation
作者:José Pedro、Gonzalo Blay、Isabel Fernández、Carlos Vila
DOI:10.1055/s-0032-1317161
日期:——
Abstract The chiral complex of (R)-3,3′-Br2-BINOL and zirconium tert-butoxide catalyzes the Friedel–Craftsalkylation of indoles with enones bearing an alkyl or fluorinated group at the β-position to give indoles having a side chain at the C3 position with a tertiary stereogenic center in good yields and with excellent enantioselectivities. The chiral complex of (R)-3,3′-Br2-BINOL and zirconium tert-butoxide
An efficient yttrium(III)-catalyzed highly enantioselectiveFriedel-Craftsalkylation of beta-trichloro(trifluoro)methyl aryl enones is described. The reaction delivered a series of functionalized indoles with a chiral tertiary carbon center bearing a trichloro(trifluoro)methyl group in excellent results (up to 96% ee and 99% yield) under mild conditions.