Chiral 4-(Diphenylphosphanyl)-1-(dialkylamino)butane Ligands – Synthesis, Applications in Asymmetric Alkylation and Theoretical Study
作者:Fabien Robert、Françoise Delbecq、Christelle Nguefack、Denis Sinou
DOI:10.1002/(sici)1099-0682(200002)2000:2<351::aid-ejic351>3.0.co;2-q
日期:2000.2
3-O-isopropylidene-D-threitol. These ligands, associated with Pd2(dba)3, gave enantioselectivities of up to 75% in the alkylation of racemic 1,3-diphenylprop-2-enyl acetate with dimethyl malonate anion. A theoretical study shows the important role played by two factors in the alkylation reaction: steric control, leading to the formation of a unique diastereoisomer of the π-allylpalladium complex, and orbital control
各种 4-(二苯基膦基)-1-(二烷基氨基) 丁烷配体由商业 (2S,3S)-2,3-O-异亚丙基-D-苏糖醇制备。这些与 Pd2(dba)3 相关的配体在外消旋 1,3-二苯基丙-2-烯基乙酸酯与丙二酸二甲酯阴离子的烷基化反应中具有高达 75% 的对映选择性。一项理论研究表明,两个因素在烷基化反应中起着重要作用:空间控制,导致形成独特的 π-烯丙基钯配合物的非对映异构体,以及轨道控制,将亲核试剂的攻击定向到磷原子.