Imino‐ and Oxazolino‐Functionalised Pyrrolylphosphanes and Pyrrolylphosphinites: An Unexploited Class of Chiral
            <i>P,N</i>
            ‐Bidentate Ligands with Unusual Electronic Properties
                                
                                    
                                        作者:Konstantin N. Gavrilov、Vasily N. Tsarev、Stanislav I. Konkin、Sergey E. Lyubimov、Alexander A. Korlyukov、Mikhail Yu. Antipin、Vadim A. Davankov                                    
                                    
                                        DOI:10.1002/ejic.200500075
                                    
                                    
                                        日期:2005.8
                                    
                                    AbstractEnantiopure P,N‐bidentate pyrrolylphosphanes and pyrrolylphosphinites have been prepared based upon chiral imino‐ and oxazolino‐containing compounds. Complexation of the new ligands with [Rh(CO)2Cl]2 and [Pd(allyl)Cl]2 has been found to give the chelate complexes [Rh(CO)Cl(η2‐P,N)] and [Pd(allyl)(η2‐P,N)]+BF4–, respectively. Imino‐ and oxazolino‐functionalised pyrrolylphosphanes and pyrrolylphosphinites have been shown to be a novel class of P,N‐bidentate ligands possessing exceptional π‐acceptor and original σ‐donor properties. With these ligands, up to 77 % ee has been achieved in the asymmetric Pd‐catalyzed sulfonylation of 1,3‐diphenyl‐2‐propenyl acetate with sodium p‐toluenesulfinate. In the enantioselective alkylation of 1,3‐diphenyl‐2‐propenyl acetate with dimethyl malonate, up to 93 % enantioselectivity has been achieved by using [Pd(allyl)(η2‐P,N)]+BF4– complexes as chiral catalysts. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)