nitrogen substitutions, leaving the four carbon atoms underutilized. Using an efficient four-step synthesis, chiral amino acids were transformed into 6-substituted piperazine-2-acetic acid esters as diastereomeric mixtures whose cis and trans products could be chromatographically separated. From six amino acids (both antipodes), a complete matrix of 24 monoprotected chiral 2,6-disubstituted piperazines
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。使用有效的四步合成方法,将手性
氨基酸转化为6-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。从六个
氨基酸(均为对映体)中,获得了24个单保护的手性2,6-二取代的
哌嗪的完整基质,每个基质都为单个绝对立体异构体(克数)。这些多样化且用途广泛的
哌嗪可在两个氮原子上进行官能化,