N-Methyl and N-n-butyl-2-(2-boronophenyl)benzimidazoles are accessed from the corresponding mono-N-alkyl-ortho-phenylenediamines, either using a polyphosphoric acid-mediated cyclisation with ortho-bromobenzoic acid, or preferably using an Oxone™-mediated cyclisation of the corresponding aldehyde, followed by a lithium-exchange and borylation sequence. The resulting boronic acids show unusual physical and chemical properties, as shown by 11B NMR and X-ray crystallography.
N-甲基和 N-正丁基-2-(2-
硼酸苯基)
苯并咪唑是从相应的单 N-烷基正
苯二胺中获得的,可以使用聚
磷酸介导的与正
溴苯甲酸的环化反应,或者最好使用 Oxone™ 介导的相应醛的环化反应,然后进行
锂交换和
硼酸化反应。如 11B NMR 和 X 射线晶体学所示,生成的
硼酸具有不同寻常的物理和
化学特性。