Reusable Chiral Dicationic Chromium(III) Salen Catalysts for Aminolytic Kinetic Resolution of trans-Epoxides
                                
                                    
                                        作者:Rukhsana I. Kureshy、K. Jeya Prathap、Tamal Roy、Nabin Ch. Maity、Noor-ul H. Khan、Sayed H. R. Abdi、Hari C. Bajaj                                    
                                    
                                        DOI:10.1002/adsc.201000428
                                    
                                    
                                        日期:2010.11.22
                                    
                                    These complexes were used as catalysts for the highly enantioselective aminolytic kinetic resolution of racemic trans-epoxides with different anilines as nucleophiles at room temperature. With the use of catalyst 3, anti-β-amino alcohols were obtained in excellent yields (>99% with respect to the nucleophile) and enantioselectivities (ee>99%) with the concomitant recovery of corresponding epoxides in
                                    A series of new recyclable chiral dicationic chromium(III) salen complexes 1–10 bearing different substituents, viz., hydrogen, methyl, tert-butyl, triphenylphosphinomethyl, triethylaminomethyl, methylimidazolium, methylpyridinium, methyl-N,N-dimethylpyridinium at the 3,3′- and 5,5′- positions of the salen unit with (1S,2S)-(+)-1,2-diaminocyclohexane, (1S,2S)-(−)-1,2-diphenyl-1,2-diaminoethane, and