Efficient one-pot synthesis of enantiomerically pure <i>N</i>-protected-α-substituted piperazines from readily available α-amino acids
作者:Mouhamad Jida、Steven Ballet
DOI:10.1039/c7nj04039c
日期:——
A new pathway towards enantiomerically pure 3-substituted piperazines, bearing a benzyl protecting group, has been developed in good overall yields (83–92%), starting from commercially available N-protected amino acids. The methodology represents an efficient and simple one-pot procedure, employing a synthetic sequence consisting of an Ugi-4 component reaction, a Boc-deprotection, an intramolecular
从市售的N-保护的氨基酸开始,已开发出一条新的途径,以对映体纯的3-取代的带有苄基保护基的哌嗪,总收率良好(83-92%)。该方法代表了一种有效且简单的一锅法,采用了由Ugi-4组分反应,Boc脱保护,分子内环化反应和最终还原(UDCR)组成的合成序列。因此,还可以通过相应的哌嗪的简单保护和脱保护步骤,从苄基保护的前体中获得带有Boc保护基的2-取代的哌嗪。证明了该方法的实际实用性用于手性药物合成。