Preparation and Application of Amino Phosphine Ligands Bearing Spiro[indane-1,2′-pyrrolidine] Backbone
作者:Shasha Li、Jinxia Zhang、Hongjie Li、Lifei Feng、Peng Jiao
DOI:10.1021/acs.joc.9b00875
日期:2019.8.2
P,Nsp3-bidentate chiral ligands bearing spiro[indane-1,2′-pyrrolidine] backbone were prepared in gram scale for the first time. Pd complexes of these air-stable amino phosphine ligands could catalyze asymmetric allylic substitutions of malonate-, alcohol-, and amine-type nucleophiles in up to 97% ee and 99% yield. A crystal structure of [Pd(II)(η3-1,3-diphenylallyl)(ligand)]PF6 indicated possible transition
首次以克级制备带有螺[茚满-1,2'-吡咯烷]骨架的P,N sp 3-双齿手性配体。这些空气稳定的氨基膦配体的Pd配合物可催化丙二酸酯,醇和胺类亲核试剂的不对称烯丙基取代,ee的收率高达97%,收率高达99%。[钯(II)(η的晶体结构3 -1,3-diphenylallyl)(配体)] PF 6所示的催化反应的可能过渡态。这些配体是非常刚性的骨架的特征,骨架很简单但非常有效。它们与C 2-对称双膦,P,N sp 2 -bidentate和P,N sp 3竞争测试的烯丙基取代中的双齿配体。