Synthesis of Enantiomerically Pure 5-Substituted Piperazine-2-Acetic Acid Esters as Intermediates for Library Production
作者:Prashi Jain、Idris O. Raji、Srinivas Chamakuri、Kevin R. MacKenzie、Brandon T. Ebright、Conrad Santini、Damian W. Young
DOI:10.1021/acs.joc.9b00148
日期:2019.5.17
diversity, a divergent six-step synthesis was developed in which chiral amino acids were transformed, with high diastereoselectivity, into either cis or trans 5-substituted piperazine-2-acetic acid esters that could be chromatographically rendered diastereomerically homogeneous. Starting from six commercially available amino acids or their respective amino alcohols (both antipodes), we obtained a complete
哌嗪杂环包含在大量 FDA 批准的药物和生物探针化合物中。然而,在结构上,这些化合物大多局限于两个环氮原子上的取代,通过碳取代使哌嗪化学多样性的扩展合理化。基于系统化学多样性的概念,开发了一个发散的六步合成,其中手性氨基酸以高非对映选择性转化为顺式或反式5-取代的哌嗪-2-乙酸酯,可以通过色谱法使非对映异构体均匀。从六种市售氨基酸或它们各自的氨基醇(两种对映体)开始,我们获得了一整套 24 种受保护的手性 2,5-二取代哌嗪,作为数克数量的单一立体异构体。这些多样化且用途广泛的哌嗪可在任一氮原子上进行功能化,使其可用作平行库合成的起始材料,以及用作靶向生产更复杂的 C 取代哌嗪化合物的中间体。