Parallel solution phase synthesis of a library of amino acid derived 2-arylamino-[1,3,4]-oxadiazoles
作者:Julia I. Gavrilyuk、Alan J. Lough、Robert A. Batey
DOI:10.1016/j.tetlet.2008.05.110
日期:2008.8
A mild method for the synthesis of peptidomimetic 2-arylamino 5-substituted 1,3,4-oxadiazoles from Boc-protected α-amino acid derived hydrazides has been developed, and applied in a parallel solution-phase synthesis. The optimized reaction conditions involve a one-pot reaction of Boc-protected amino acid hydrazides with arylisothiocyanates in the presence of either Hg(II) chloride, Mukaiyama’s reagent
从Boc保护的α-氨基酸衍生的酰肼合成拟肽模拟的2-芳基氨基5取代的1,3,4-恶二唑的温和方法已经开发出来,并应用于平行溶液相合成中。优化的反应条件包括在氯化汞(II),Mukaiyama's试剂(2-氯-N-甲基吡啶碘化物)或聚合物支撑的Mukaiyama's试剂与三乙胺的存在下,Boc保护的氨基酸酰肼与芳基异硫氰酸酯的一锅反应。在室温下在二氯甲烷中。获得1,3,4-恶二唑产物的收率好至极好,而没有任何可检测的差向异构体。反应通过首先形成硫代氨基脲而进行,然后脱硫羟化环化成1,3,4-恶二唑。