Chelucci, Giorgio Adolfo and Loriga, Giovanni and Murineddu, Gabriele and Pinna, Gérard Aimé (2002) Design of a new class of chiral C2-symmetric dipyridylmethane ligands and their application in asymmetric catalysis. Tetrahedron Letters, Vol. 43 (47), p. 8599-8602. ISSN 0040-4039. Article.
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A new class of chiral C2-symmetric dipyridylmethane ligands was prepared from naturally occurring monoterpenes, according to a method based on a double Michael–azaannellation–aromatization sequence. These ligands were assessed in the enantioselective palladium-catalyzed allylic alkylation of 1,3-diphenylprop-2-enyl acetate with dimethylmalonate and in the copper-catalyzed cyclopropanation of styrene with ethyl diazoacetate. Enantioselectivity up to 88% ee was obtained.
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