[reaction: see text] Bissulfoximines have been used as chiral ligands in copper-catalyzedenantioselective Diels-Alder reactions between acryloyl-2-oxazolidinones and cyclopentadiene. After optimizing the ligand structure, the metal source, the counterions, and the solvent, products with up to 93% ee have been obtained.
Cationic rhodium(I)–diolefin complexes containing an optically active C2-symmetric bis(sulfoximine) ligand: Synthesis and catalytic activity
作者:Victorio Cadierno、Josefina Díez、Sergio E. García-Garrido、José Gimeno、Antonio Pizzano
DOI:10.1016/j.poly.2010.09.017
日期:2010.12
series of cationicrhodium(I) complexes [Rh(diene)(N^N)][BF4] (diene = 1,5-cyclooctadiene (cod), norbornadiene (nbd), tetrafluorobenzobarralene (tfb)), containing the optically pure bis(sulfoximine) ligand 1,2-bis(S-methyl-S-phenylsulfonimidoyl)benzene, have been synthesized and fully characterized. The structure of the R,R enantiomer of the ligand, and that of its cyclooctadiene–Rh(I) complex, were confirmed