(Diphenylphosphino)-biheteroaryls: the first example of a new class of chiral atropisomeric chelating diphosphine ligands for transition metal catalysed stereoselective reactions
作者:Tiziana Benincori、Elisabetta Brenna、Franco Sannicolò、Licia Trimarco、Patrizia Antognazza、Edoardo Cesarotti
DOI:10.1039/c39950000685
日期:——
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.
二氯化钌(II)与(+)-和(–)-2,2′-双(二苯基膦)-4,4′,6,6′-四甲基-3,3′-双苯并[b]噻吩(1a)形成的配合物,这些新的手性对映异构体杂环配体,可以将α-和β-氧酯还原为α-和β-羟基酯,其对映体纯度相当,甚至高于在相同实验条件下报道的binap的对映体纯度。