Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 7, Pages 2172-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja710665q
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A bis-sulfoxide with a binaphthyl backbone is introduced as a readily available, chiral ligand entity in late-transition metal catalysis. Ligand p-tol-BINASO [where P-tol-BINASO is 1,1'-binaphthalene-2,2'-diyl-bis-(p-tolysulfoxide)] is obtained in pure form in one single synthetic step from relatively cheap, commercially available starting materials. Precatalyst [((P,R,R)-p-tol-BINASO)RhCl](2) was synthesized in high yield and structurally characterized by X-ray diffraction, and structural data were compared to the free ligand. The precatalyst shows both excellent reactivity and selectivity in the asymmetric 1,4-addition of arylboronic acids to cyclic alpha,beta-unsaturated ketones and esters.
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