Synthesis of Enantiomerically Pure 3-Substituted Piperazine-2-acetic Acid Esters as Intermediates for Library Production
作者:Shiva Krishna Reddy Guduru、Srinivas Chamakuri、Idris O. Raji、Kevin R. MacKenzie、Conrad Santini、Damian W. Young
DOI:10.1021/acs.joc.8b01708
日期:2018.10.5
substitutions, leaving the four carbon atoms underutilized. Using an efficient six-step synthesis, chiral amino acids were transformed into 3-substituted piperazine-2-acetic acid esters as diastereomeric mixtures whose cis and trans products (dr 0.56 → 2.2:1, respectively) could be chromatographically separated. From five amino acids (both antipodes) was obtained a complete matrix of 20 monoprotected chiral 2
哌嗪杂环在FDA批准的药物和生物活性化合物中得到广泛利用,但其化学多样性通常仅限于环氮取代,从而使四个碳原子未被充分利用。使用高效的六步合成方法,将手性氨基酸转化为3-取代的哌嗪-2-乙酸酯,为非对映异构体混合物,其色谱图可分离出顺式和反式产物(分别为dr 0.56→2.2:1)。从五个氨基酸(均为对映体)获得了20个单保护的手性2,3-二取代的哌嗪的完整基质,每种均作为单个绝对立体异构体,但均以克数表示。与构建更多Csp 3的总体目标保持一致这些丰富多样的哌嗪具有丰富的用于药物发现的化合物库,可以在两个氮原子上官能化,使其可用作平行库合成的支架,并用作生产新型哌嗪化合物的中间体。