ppm Pd‐Containing Nanoparticles as Catalysts for Negishi Couplings …
<i>in Water</i>
作者:Yuting Hu、Madison J. Wong、Bruce H. Lipshutz
DOI:10.1002/anie.202209784
日期:2022.9.26
Palladium-catalyzed Negishicouplings rely typically on pre-formed organozinc reagents, dry organic solvents, and unsustainable loadings of a Pdcatalyst (usually 1–5 mol %). In this report we describe heterogeneous nanoparticle-catalyzed couplings under mild conditions using water as the reaction medium, and only ppm levels of a Pdcatalyst.
para-Selective, Direct C(sp<sup>2</sup>)–H Alkylation of Electron-Deficient Arenes by the Electroreduction Process
作者:Pufan Ni、Lei Yang、Jiasheng Yang、Ruihua Cheng、Weiping Zhu、Yueyue Ma、Jinxing Ye
DOI:10.1021/acs.joc.2c02412
日期:2023.5.5
para-selective C(sp2)–H alkylation of electron-deficient arenes based on the electroreduction-enabled radical addition of alkyl bromides has been developed under mild conditions. In the absence of any metals and redox agents, the simple electrolysis system tolerates a variety of primary, secondary, and tertiary alkyl bromides and behaves as an important complement to the directed alkylation of the C(sp2)–H bond
An efficient method for the synthesis of industrially important dibenzyls and alkyl phenyl esters via sequential Heck coupling and hydrogenation of the alkenyl double bond in one pot with a single recyclable catalyst under mild conditions has been realised. The catalyst was recovered by simple filteration and reused for several cycles with consistent activity.