Regioselective synthesis of <i>ortho</i>-iodobiphenylboronic acid derivatives: a superior catalyst for carboxylic acid activation
作者:Raed M. Al-Zoubi、Walid K. Al-Jammal、Robert McDonald
DOI:10.1039/c9nj05708k
日期:——
An efficient and versatile synthesis of ortho-iodobiphenylboronic acids via the highly regioselective metal–iodine exchange (MIE) of 2,3-diiodobiphenyls is reported. The site-selectivity is very much controlled by the size of the biphenyl fragment, providing only the terminal arylboronic acid derivatives in excellent site-selectivity. The nature of the substituents (R1 and R2) on the biphenyls is found
据报道,通过2,3-二碘联苯的高度区域选择性金属-碘交换(MIE),可以高效,通用地合成邻碘联苯硼酸。联苯片段的大小很大程度上控制了位点选择性,仅以优异的位点选择性提供了末端芳基硼酸衍生物。发现联苯上的取代基(R 1和R 2)的性质对反应性有影响,但对区域选择性没有影响。带有给电子基团的产物提供了最佳的反应性和最高的分离产率。合成的衍生物也进行了体外测试对四种菌株和一种真菌菌株具有抗菌活性。这表明(2-碘-4'-异丙基-[1,1'-联苯] -3-基)硼酸6 A和(3-(苯并[ d ] [1,3]二氧戊基5-基) -2-碘-5-甲氧基苯基)硼酸22 A具有最强的抗菌和抗真菌活性,对蜡状芽孢杆菌和白色念珠菌的MIC分别为0.10和0.3 mg mL -1。还检查了在室温下对酰胺化反应的催化活性,这揭示了一种新的最佳催化剂,(2-碘-4',5-二甲氧基-[1,1'-联苯] -3-基)硼酸19 A