A general method for the facile synthesis of optically active 2-substituted piperazines via functionalized 2,5-diketopiperazines
作者:Kate S. Ashton、Mitchell Denti、Mark H. Norman、David J. St. Jean
DOI:10.1016/j.tetlet.2014.06.058
日期:2014.8
Upon utilization of some common methods described in the literature for the synthesis of chiral, 2-substituted 2,5-diketopiperazines, extensive racemization was observed. Further investigation showed that heating in the presence of a mild base racemized the chiral center in the product diketopiperazines. A generalized, readily scalable route was sought and, after investigating the effect of base and
利用文献中描述的一些常规方法合成手性的2-取代的2,5-二酮哌嗪类化合物时,观察到了广泛的消旋作用。进一步的研究表明,在温和碱的存在下加热会使产物二酮哌嗪中的手性中心消旋。寻找一种通用的,易于扩展的途径,并在研究了碱和温度的影响后,确定了促进环化且不损害对映异构体过量的条件。容许一系列功能化,并且该程序用作简便合成这一重要类别化合物的有用且可靠的方法。