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(Diphenylphosphino)-biheteroaryls: the first example of a new class of chiral atropisomeric chelating diphosphine ligands for transition metal catalysed stereoselective reactions

1995; Royal Society of Chemistry; Issue: 6 Linguagem: Inglês

10.1039/c39950000685

2050-5639

Tiziana Benincori, Elisabetta Brenna, Franco Sannicolò, Licia Trimarco, Patrizia Antognazza, Edoardo Cesarotti,

Asymmetric Synthesis and Catalysis

Ruthenium(II) dichloride complexes with (+)- and (–)-2,2′-bis(diphenylphosphino)-4,4′,6,6′-tetramethyl-3,3′-bibenzo[b]thiophene (1a), new chiral atropisomeric heterocyclic ligands, reduce α- and β-oxoesters to α- and β-hydroxyesters with an enantiomeric purity comparable, if not higher, to that reported for binap under the same experimental conditions.