Rhodium- and platinum-catalyzed asymmetric hydroformylation with (2S,3S )-2,3-bis(diphenylphosphino)butane as the chiral ligand
作者:Giambattista Consiglio、Franco Morandini、Michelangelo Scalone、Piero Pino
DOI:10.1016/0022-328x(85)87017-0
日期:1985.1
Some mono- and disubstituted ethenes have been asymmetrically hydroformylated with rhodium and platinum catalysts using (2S,3S)-2,3-bis(diphenylphosphino)butane (Chiraphos) as the chiral ligand (maximum optical yield ∼ 45%). The results are compared with those obtained when the chiral ligand is (4R,5R)-2,2-dimethyl-4,5-bis(diphenylphosphinomethyl)-1,3-dioxolane (Diop). The Chiraphos ligand causes a
使用(2 S,3 S)-2,3-双(二苯基膦基)丁烷(Chiraphos)作为手性配体,使用铑和铂催化剂将一些单取代和二取代的乙烯不对称加氢甲酰化(最大光学收率约为45%)。将结果与手性配体为(4 R,5 R)-2,2-二甲基-4,5-双(二苯基膦甲基)-1,3-二氧戊环(Diop)。Chiraphos配体导致相对于Diop的催化活性降低。对于Chiraphos,铑催化剂的光学收率始终较高,而使用铂催化剂则获得了分散的结果。由于对于所检查的催化体系,不对称诱导发生在中间体非对映体金属烷基络合物的形成之前或之中,因此,基于立体化学模型对导致上述金属烷基络合物中间体的过渡态暂时地合理化了结果。