Novel route to azobenzenes via Pd-catalyzed coupling reactions of aryl hydrazides with aryl halides, followed by direct oxidations.
[reaction: see text] N-Boc aryl hydrazines undergo Pd-catalyzed coupling reactions with aryl halides to provide N-Boc diaryl hydrazines in excellent yields. The resulting N-Boc diaryl hydrazines were directly oxidized with NBS/pyridine in CH(2)Cl(2) at room temperature to the azobenzenes.
Lim
Young-Kwan
YK
Department of Chemistry, Hanyang University, Seoul 133-791, Korea.
Lee
Kang-Sang
KS
Cho
Cheon-Gyu
CG