Multiple-Functional Diphosphines: Synthesis, Characterization, and Application to Pd-Catalyzed Alkoxycarbonylation of Alkynes
作者:Kai-Chun Zhao、Lei Liu、Xiao-Chao Chen、Yin-Qing Yao、Lin Guo、Yong Lu、Xiao-Li Zhao、Ye Liu
DOI:10.1021/acs.organomet.1c00713
日期:2022.3.28
A series of diphosphine ligands (L1–L5) containing bis-phosphino fragments and bis-amido groups as well as intensive electron-withdrawing F atoms were synthesized and fully characterized. The structures of the prepared complex of Pd-L5 demonstrate that as for L5, the incorporated two phosphino fragments participate in the chelation to the Pd center inversely along with two Cl– ligands to present a
合成并充分表征了一系列含有双膦基片段和双酰胺基以及强吸电子 F 原子的二膦配体 ( L1-L5 )。所制备的Pd-L5配合物的结构表明,对于L5,掺入的两个膦基片段与两个 Cl -配体反向参与到 Pd 中心的螯合,呈现典型的方平面构型,而两个酰胺基团同时发展与Cl -配体的氢键相互作用,以促进Cl -配体从Pd中心及时解离。发现L5使 Pd 配合物在炔烃与 MeOH 的烷氧基羰基化反应中更具活性,用于合成支链/直链 α,β-不饱和羧酸酯,一般产率为 60-89%。在L5中,掺入的二膦基片段、二氨基和 F 原子赋予 Pd 配合物催化作用,协同反应。