Scaled-Up Transition-Metal-Catalyzed Cross-Coupling Reactions of Thioether-Substituted N-Heterocycles with Organozinc Reagents
作者:Paul Knochel、Albrecht Metzger、Laurin Melzig
DOI:10.1055/s-0030-1258145
日期:2010.8
A variety of functionalized methylthio-substituted N-heterocycles (pyridines, pyrimidines, pyrazines, pyridazines, triazines, quinazolines, benzothiazoles) undergo smooth palladium- or nickel-catalyzed cross-couplings with highlyfunctionalized organozinc reagents at ambient temperature. No expensive copper(I) salts are required and the coupling reactions proceed readily in the range of up to 20 mmol
Pd- and Ni-Catalyzed Cross-Coupling Reactions of Functionalized Organozinc Reagents with Unsaturated Thioethers
作者:Laurin Melzig、Albrecht Metzger、Paul Knochel
DOI:10.1002/chem.201002850
日期:2011.3.1
serve as electrophiles in this cross‐coupling reaction. Aryl‐, heteroaryl‐, benzylic, and alkylzinc halides with sensitive functionalities, such as ester, nitrile, or ketone groups react at ambient temperature with unsaturated thioethers using a Ni catalyst. The corresponding Pd‐catalyzed reactions require slightly higher temperatures. Large‐scale cross‐coupling experiments (10–20 mmol) with N‐heterocycles