Synthesis of Functionalized Indoles with an α-Stereogenic Ketone Moiety Through an Enantioselective Friedel-Crafts Alkylation with (<i>E</i>)-1,4-Diaryl-2-butene-1,4-diones
作者:Gonzalo Blay、Isabel Fernández、Alicia Monleón、M. Carmen Muñoz、José R. Pedro、Carlos Vila
DOI:10.1002/adsc.200900357
日期:2009.10
temperature, with good yields and ee up to 94%. Hafnium(IV) was found to be a more effective Lewis acid than other frequently used metal ions such as titanium(IV) or zirconium(IV). Unlike the enantioselective Friedel–Crafts alkylation of indoles with α,β-unsaturated compounds where the stereogenic center is generated in the β-position to a carbonyl group, the Friedel–Crafts alkylation with 2-butene-1