Impregnated palladium on magnetite as catalyst for direct arylation of heterocycles
作者:Rafael Cano、Juana M. Pérez、Diego J. Ramón、Gerard P. McGlacken
DOI:10.1016/j.tet.2015.12.039
日期:2016.2
magnetite is an efficient, cheap and easy to prepare catalyst for the direct arylation of heterocycles. Good yields are afforded under relatively mild conditions and a broad substrate scope is evident. The catalyst is regioselective in many cases, affording arylated products, at the C2- or C3-position (depending of the heterocycle used). The methodology can be extended to prepare chromenes through an intramolecular
Double Couplings of Dibromothiophenes Using Boronic Acids and Boronates
作者:Scott Handy、Samantha Varello
DOI:10.1055/s-0028-1083262
日期:2009.1
couplings work well for 2,4-dibromothiophene, but are much more sensitive to steric effects in the case of 2,3-dibromothiophene. By using the recently reported potassium borates, though, good yields for both dibromothiophene isomers can be achieved. Suzuki couplings - regioselectivity - heteroaromatics - thiophenes - cross-coupling reactions - palladium catalysis