β-Amino Alcohol Derived β-Hydroxy- and β-(<i>o</i>-Diphenylphosphino)benzoyloxy(<i>o</i>-diphenylphosphino)benzamides: An Ester−Amide Ligand Structural Model for the Palladium-Catalyzed Allylic Alkylation Reaction
作者:Geetanjali S. Mahadik、Stanley A. Knott、Lisa F. Szczepura、Steven J. Peters、Jean M. Standard、Shawn R. Hitchcock
DOI:10.1021/jo9016474
日期:2009.11.6
from cis-(1R,2S)-2-amino-1,2-diphenyl-1-ethanol, and when applied in the asymmetric allylic alkylation reaction, it yielded the product in an enantiomeric ratio of 97.8.22 favoring the (S)-enantiomer. A computational study was conducted on the conformation that this ligand might adopt in the palladium-catalyzed alkylation reaction as compared to that of the Trost ligand 1a.
市售的β-氨基醇已被转化为它们相应的β-羟基-和β-(邻-二苯基膦基)苯甲酰氧基(邻-二苯基膦基)苯甲酰胺11a - f和12a - f,并已用于Tsuji-Trost 1,3-二苯基丙烯基乙酸酯的不对称烷基化反应。除了配体11b和11f,β-羟基苯甲酰氧基(邻-二苯基膦基)苯甲酰胺配体11a - f主要提供产物的(R)-对映体。相反,双(膦)配体12a- ˚F始终得到(小号)体。最佳配体(12c)衍生自顺式-(1 R,2 S)-2-氨基-1,2-二苯基-1-乙醇,当用于不对称烯丙基烷基化反应时,生成对映体产物(S)-对映异构体的比例为97.8.22 。与Trost配体1a相比,对该配体在钯催化的烷基化反应中可能采用的构象进行了计算研究。