Modulating N- versus O-arylation in pyrazolone-aryl halide couplings
摘要:
The regioselective, copper-catalyzed coupling of a tautomeric pyrazolone/pyrazole with 2-halopyridines was investigated. Conditions were developed to preferentially form either the N-aryl or O-aryl product. (C) 2007 Elsevier Ltd. All rights reserved.