Well-defined palladium(0) complexes bearing N-heterocyclic carbene and phosphine moieties: efficient catalytic applications in the Mizoroki–Heck reaction and direct C–H functionalization
作者:Jhen-Yi Lee、Jiun-Shian Shen、Ru-Jiun Tzeng、I-Chen Lu、Jenn-Huei Lii、Ching-Han Hu、Hon Man Lee
DOI:10.1039/c6dt01323f
日期:——
Two series of well-defined palladium(0) complexes with phosphine-functionalized N-heterocyclic carbene ligands were prepared. These complexesfeatured six- and seven-membered chelate rings in the two series. Among the seven-membered chelate complexes, those featuring the PCy2 moiety exhibited observable fluxional behavior on the NMR time scale, corresponding to the interchange between two sets of conformations
A chemo- and stereoselective Pd-catalysed semi-reduction of alkynes to (Z)-alkenes has been performed in a phosphonium-based DES by using the in situ generation of H2 from Al/H2O. The antitumor agent combretastatin A4 has been also synthesized.
通过利用 Al/H2O 原位生成 H2,在膦基 DES 中进行了炔烃到 (Z)- 烯的化学和立体选择性钯催化半还原反应。此外,还合成了抗肿瘤药物考布他丁 A4。
Studies on the 1,2-Migrations in Pd-Catalyzed Negishi Couplings with JosiPhos Ligands
作者:Anders T. Lindhardt、Thomas M. Gøgsig、Troels Skrydstrup
DOI:10.1021/jo801824e
日期:2009.1.2
cross-coupling, which is promoted by palladium catalyst systems generated with JosiPhos ligands. Several of the factors that were demonstrated to be important for the 1,2-migration include (1) the nucleophilicity of the organometallic reagent, which possibly influences the transmetalation step in direct competition with the intermediate β-hydride elimination of the alkenyl Pd(II) species; (2) the structural