A Chiral Sulfoxide-Ligated Ruthenium Complex for Asymmetric Catalysis: Enantio- and Regioselective Allylic Substitution
作者:Barry M. Trost、Meera Rao、André P. Dieskau
DOI:10.1021/ja411310w
日期:2013.12.11
and synthesis of a novel chiral sulfoxide-ligated cyclopentadienyl ruthenium complex is described. Its utility as an asymmetric variant of [CpRu(MeCN)3]PF6 is demonstrated through its ability to function in the branched-selective asymmetric allylic alkylation of phenols and carboxylic acids. Water has also been shown to act as a competent nucleophile in this reaction to generate branched allyl alcohols
Copper-catalyzed enantioselective allylic oxidation of acyclic olefins
作者:Bo Zhang、Shou-Fei Zhu、Qi-Lin Zhou
DOI:10.1016/j.tetlet.2013.03.046
日期:2013.5
copper-catalyzed asymmetricallylicoxidation of acyclic olefins has been developed. By using the complexes of copper and chiral spiro bisoxazoline ligands as catalysts, the oxidation of various acyclic olefins was accomplished with excellent regioselectivity (>20:1 in most cases) and up to 67% ee under mild reaction conditions, which represents one of the best results for the enantioselective allylic oxidation
Enantio- and regioselective asymmetric allylic substitution using a chiral aminophosphinite ruthenium complex: an experimental and theoretical investigation
作者:Rajesh K. Jena、Dhiraj Das
DOI:10.1039/d1ra06824e
日期:——
The design and synthesis of a new chiral aminophosphinite-ligated ruthenium complex is described. The ruthenium complex, [Ru(AMP)2(CH3CN)2][BPh4]2 AMP = (S)-tert-butyl 1-(diphenylphosphinooxy)-3-methylbutan-2-ylcarbamate}, has been found to catalyze nucleophilic addition of phenol and carboxylic acid to allyl chloride in a highly regioselective fashion with enantiomeric excess ranging from 12 to 90
The asymmetric kharasch reaction. Catalytic enantioselective allylic acyloxylation of olefins with chiral copper(I) complexes and tert-butyl perbenzoate
作者:Merritt B. Andrus、Ankush B. Argade、Xi Chen、Michael G. Pamment
DOI:10.1016/0040-4039(95)00444-h
日期:1995.4
Olefins were treated with tert-butyl perbenzoate in the presence of hiral copper(I) triflate bisoxazoline complexes to give non-racemic allyl benzoates as products. The yields range from 34 to 62% and the enantiomeric excesses from 30 to 81%. A model for the selectivity is proposed.
Enantioselective oxidation of olefins catalyzed by chiral copper bis(oxazolinyl)pyridine complexes: a reassessment
作者:Sandeep K. Ginotra、Vinod K. Singh
DOI:10.1016/j.tet.2006.01.093
日期:2006.4
Copper complexes of chiral tridentate pybox ligands synthesized using a modified procedure have been studied as catalysts for the enantioselective allylic oxidation of olefins. A variety of olefins have been used in this reaction. Using 5 mol% of a Cu(II) complex of the tridentate pybox ligand, phenylhydrazine, and tert-butyl perbenzoate as oxidant in acetone, optically active allylic benzoates were