Proton-Abstraction Mechanism in the Palladium-Catalyzed Intramolecular Arylation: Substituent Effects
作者:Domingo García-Cuadrado、Paula de Mendoza、Ataualpa A. C. Braga、Feliu Maseras、Antonio M. Echavarren
DOI:10.1021/ja071034a
日期:2007.5.1
The regioselectivity observed in the intramolecularpalladium-catalyzed arylation of substituted bromobenzyldiarylmethanes as well as theoretical results demonstrate that the Pd-catalyzed arylation proceeds by a mechanism involving a proton abstraction by the carbonate, or a related basic ligand. The reaction is facilitated by electron-withdrawing substituents on the aromatic ring, which is inconsistent
A new, <i>substituted</i> palladacycle for ppm level Pd-catalyzed Suzuki–Miyaura cross couplings in water
作者:Balaram S. Takale、Ruchita R. Thakore、Sachin Handa、Fabrice Gallou、John Reilly、Bruce H. Lipshutz
DOI:10.1039/c9sc02528f
日期:——
an aqueous micellar medium, enabling valued Suzuki–Miyaura couplings to be run not only in water under mild conditions, but at 300 ppm of Pd catalyst. This general methodology has been applied to several targets in the pharmaceutical area. Multiple recyclings of the aqueous reaction mixture involving both the same as well as different coupling partners is demonstrated. Low temperature microscopy (cryo-TEM)