Synthesis of 2-substituted piperazines via direct α-lithiation
摘要:
A novel efficient synthetic route towards the pharmaceutically relevant 2-substituted piperazine class is described. The key step involves alpha-lithiation of N-Boc piperazines, followed by reaction with several electrophiles. To obtain high yields, in some cases transmetallation to copper after the lithiation step is required. (c) 2005 Elsevier Ltd. All rights reserved.