Pd-PEPPSI-IPent-SiO<sub>2</sub>: A Supported Catalyst for Challenging Negishi Coupling Reactions in Flow
作者:Gregory A. Price、Abbas Hassan、Nalin Chandrasoma、Andrew R. Bogdan、Stevan W. Djuric、Michael G. Organ
DOI:10.1002/anie.201708598
日期:2017.10.16
precatalyst, Pd‐PEPPSI‐IPent‐SiO2, has been prepared and evaluated for its proficiency in the Negishi cross‐coupling of hindered and electronically deactivated coupling partners. The precatalyst Pd‐PEPPSI‐IPent loaded onto packed bed columns shows high catalytic activity for the room‐temperature coupling of deactivated/hindered biaryl partners. Also for the first time, the flowed Csp3–Csp2 coupling of secondary
Enantioselective Copper-Catalyzed Alkylation of Quinoline <i>N</i>
-Oxides with Vinylarenes
作者:Songjie Yu、Hui Leng Sang、Shaozhong Ge
DOI:10.1002/anie.201709411
日期:2017.12.11
copper‐catalyzed alkylation of quinoline N‐oxides with chiral Cu–alkyl species, generated by migratory insertion of a vinylarene into a chiral Cu−H complex, is reported. A variety of quinoline N‐oxides and vinylarenes underwent this Cu‐catalyzedenantioselective alkylation reaction, affording the corresponding chiral alkylated N‐heteroarenes in high yield with high‐to‐excellent enantioselectivity. This
Photosubstitution Reactions of 4-Methyl-2-quinolinecarbonitrile with Arylalkanoic Acids. No Evidence for the External Magnetic Field Effects or Chiral Symmetry Breaking
No appreciable magneticfield effects were observed on the relative quantum yield for photochemical reactions of 4-methyl-2-quinolinecarbonitrile with (R)-(−)-2-phenylpropionic, diphenylacetic, and 2,2-diphenylpropionic acids in benzene. Observed results were reasonably explained in terms of kinetic parameters which are dependent on and independent of an external magneticfield. (S)-(+)- and (R)-(
A photochemical benzylation of protonated quinolines was realized by single electron transfer (SET) to the excited state of the quinoline from the aromatic reactant. The benzylated product is formed by cross-coupling between the benzyl radical and the heterocyclic radical when they are in close proximity to one another. This allows the formation of products which are, to the best of our knowledge, unaccessible in other ways and which have now been obtained for the first time. (C) 2010 Elsevier B.V. All rights reserved.