Enantioselective Friedel-Crafts Alkylation of Indoles with (<i>E</i>)-1-Aryl-4-benzyloxybut-2-en-1-ones Catalyzed by an (<i>R</i>)-3,3′-Br<sub>2</sub>BINOLate-Hafnium(IV) Complex
作者:Gonzalo Blay、Isabel Fernández、M. Carmen Muñoz、José R. Pedro、Carlos Vila
DOI:10.1002/ejoc.201201636
日期:2013.4
A highly enantioselectiveFriedel–Crafts reaction of unprotected indoles with (E)-1-aryl-4-benzyloxybut-2-en-1-onescatalyzed by a new chiral [Hf(R)-3,3′-Br2-BINOL}(OtBu)2]2 complex has been developed to functionalize the C-3 position of the indole nucleus with a side chain bearing a 1,4-difunctionalized moiety and a benzylic stereogenic center. The reaction proceeds in good to excellent yields and