Rhodium-catalyzed asymmetric 1,4-additions of electron-deficient heteroaryl groups to alpha,beta-unsaturated carbonyl compounds were established. The reaction resulted in very low yields due to competitive C-B bond cleavage when arylboronic acids. their pinacol esters, or potassium trifluoroborates were used. However, the corresponding lithium heteroaryl(triol)borates afforded 1,4-adducts With high enantioselectivities up to 97% in the presence of a rhodium(I) catalyst chelated with a chiral BINAP or BIPAM ligand.
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Ecole Natl Super Chim Paris, Lab Charles Friedel, CNRS, UMR 7223, F-75231 Paris 05, FranceEcole Natl Super Chim Paris, Lab Charles Friedel, CNRS, UMR 7223, F-75231 Paris 05, France
Gendrineau, Thomas
Genet, Jean-Pierre
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Ecole Natl Super Chim Paris, Lab Charles Friedel, CNRS, UMR 7223, F-75231 Paris 05, FranceEcole Natl Super Chim Paris, Lab Charles Friedel, CNRS, UMR 7223, F-75231 Paris 05, France
Genet, Jean-Pierre
Darses, Sylvain
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Ecole Natl Super Chim Paris, Lab Charles Friedel, CNRS, UMR 7223, F-75231 Paris 05, FranceEcole Natl Super Chim Paris, Lab Charles Friedel, CNRS, UMR 7223, F-75231 Paris 05, France