Synthesis and structure of bifunctional N-alkylbenzimidazole phenylboronate derivatives
作者:Alexandrea J. Blatch、Olga V. Chetina、Judith A. K. Howard、Leonard G. F. Patrick、Christian A. Smethurst、Andrew Whiting
DOI:10.1039/b607127a
日期:——
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。