Enantioselective Aziridination Using Copper Complexes of Biaryl Schiff Bases
作者:Kevin M. Gillespie、Christopher J. Sanders、Paul O'Shaughnessy、Ian Westmoreland、Christopher P. Thickitt、Peter Scott
DOI:10.1021/jo025515i
日期:2002.5.1
Racemic2,2'-diamino-6,6'-dimethylbiphenyl is resolved using simulated moving bed chromatography, and the absolute configuration of the enantiomers is confirmed via the X-ray crystal structure of a derivative. The diamine is condensed with a range of aldehydes to give bidentate aldimine proligands L. Molecular structures of the complexes formed between L and Cu(I) fall into two classes; bimetallic
One-Pot Enantioselective Aziridination of Olefins Catalyzed by a Copper(I) Complex of a Novel Diimine Ligand by Using PhI(OAc)2 and Sulfonamide as Nitrene Precursors
作者:Xisheng Wang、Kuiling Ding
DOI:10.1002/chem.200501109
日期:2006.6.2
A novel chiral C(2)-symmetric 1,4-diamine with multistereogenic centers at the backbone of the ligand has been synthesized from cheap natural product D-mannitol through multistep transformations. Its diimine derivative (3 a) was found to be highly effective for the enantioselective control of the copper-catalyzed asymmetric aziridination of olefin derivatives with PhI==NTs as the nitrene source, affording
The chiral Cu(I)-N,N′-bis(2,6-dichlorobenzylidene)-1,1′-binaphthyl-2,2′-diamine complex was found to be an efficientcatalyst for asymmetriccyclopropanation and aziridination reactions of olefins with l-menthyl diazoacetate and [N-(p-tolylsulfonyl)imino]phenyliodinane, respectively. Among mono- and disubstituted olefins, 1,1-diarylethylenes showed extremely high enantioselectivities (up to 98% ee)
Mechanism of alkene aziridination in the [(biaryldiimine)CuI] catalyst system; precise substrate orientation via two-centre binding
作者:Kevin M. Gillespie、Edward J. Crust、Robert J. Deeth、Peter Scott
DOI:10.1039/b101415n
日期:——
The highly enantioselective (⩽98%) aziridination of
cinnamate esters is achieved using the title catalyst system via a
concerted non-polar mechanism involving ancillary binding of carbonyl group
to copper.
Axially dissymmetric binaphthyldiimine chiral salen-type ligands for copper-catalyzed asymmetric aziridination
作者:Min Shi、Chuan-Jiang Wang、Albert S.C. Chan
DOI:10.1016/s0957-4166(01)00534-1
日期:2001.12
chiral salen-type ligands 1–4 and 7 were prepared from the reaction of (R)-(+)-1,1′-binaphthyl-2,2′-diamine with 2,6-dichlorobenzaldehyde, 2,3-dichlorobenzaldehyde, 3,4-dichlorobenzaldehyde or salicylaldehyde in high yields, respectively. The catalytic asymmetricaziridination of alkenes has been examined using these novel chiral ligands. Excellent enantioselectivity in the aziridination of cinnamates