Synthesis of N,N-Dialkyl-N‘-arylhydrazines via Palladium-Catalyzed N-Arylation by Using N,N-Dialkylhydrazines/2LiCl Adducts
摘要:
[GRAPHICS]The reaction of N,N-dialkylhydrazine/2LiCl adducts with aryl bromides in the presence of Pd-2(dba)(3) as the palladium source, Xantphos or X-phos as the ligands, toluene as the solvent, and NaOBu-t as the base provides an efficient route to N,N-dialkyl-N,-arylhydrazines. Best results were obtained by using N,N-dialkylhydrazine/2LiCl adducts prepared in situ, omitting their isolation.