A variety of functionalized methylthio-substituted N-heterocycles
(pyridines, pyrimidines, pyrazines, pyridazines, triazines, quinazolines,
benzothiazoles) undergo smooth palladium- or nickel-catalyzed cross-couplings
with highly functionalized 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 scale.
zinc organometallics - cross-coupling - thioether - palladium - nickel