An improved synthesis of N-aryl and N-heteroaryl substituted homopiperazines—from conventional thermal conditions to scaling-up using microwave heating
作者:Uwe Schön、Josef Messinger、M. Buckendahl、M.S. Prabhu、A. Konda
DOI:10.1016/j.tet.2009.07.086
日期:2009.9
An efficient Pd(0)-catalyzed Buchwald-Hartwig protocol for the facile preparation of N-aryl and N-heteroaryl substituted homopiperazines is described. The syntheses proceeded with aryl- and heteroaryl halides in high yields using X-Phos as best ligand. The C-N coupling products were prepared both under conventional as well as microwave heating conditions and examples for microwave-assisted upscaling are included in this study. (C) 2009 Elsevier Ltd. All rights reserved.