A Unified Strategy Towards<i>N</i>-Aryl Heterocycles by a One-Pot Copper-Catalyzed Oxidative C-H Amination of Azoles
作者:Parthasarathi Subramanian、Krishna P. Kaliappan
DOI:10.1002/ejoc.201402868
日期:2014.9
An efficient one-pot synthesis of N-aryl-substituted heterocycles by a Cu-catalyzed two-fold C–N bond formation is reported. This strategy involves a Cu I -catalyzed C–N bond-forming reaction between azoles and electron-deficient bromopyridines followed by an intramolecular sp 2C–Hamination. One of the products thus formed has been successfully used as a ligand for the synthesis of a Pd complex.
报道了一种通过 Cu 催化的双 C-N 键形成有效地一锅法合成 N-芳基取代的杂环的方法。该策略涉及唑类和缺电子溴吡啶之间的 Cu I 催化的 C-N 键形成反应,然后是分子内 sp 2 C-H 胺化。由此形成的产物之一已成功用作合成钯配合物的配体。
An interesting recyclization in the course of reduction of 1-(2-nitro-4-R-phenyl)-1H-benzimidazoles with tin(II) chloride
作者:Roman S. Begunov、Tatyana V. Shebunina、Yulia S. Yakovleva、Sergey I. Firgang
DOI:10.1016/j.mencom.2013.11.018
日期:2013.11
Reduction of 1-(2-nitro-4-R-phenyl)-1H-benzimidazoles with tin(H) chloride in an acidic water alcohol medium is accompanied by unusual recyclization of 1-(2-amino-4-R-phenyl)-1H-benzimidazoles formed at the first stage into isomeric 1-(2-aminopheny1)-5-R- 1H-benzimidazoles.
Synthesis and reactivity of azole-based iodazinium salts
A systematic investigation of imidazo- and pyrazoloiodazinium salts is presented. Besides a robust synthetic protocol that allowed us to synthesize these novel cyclic iodonium salts in their mono- and dicationic forms, we gained in-depth structural information through single-crystal analysis and demonstrated the ring opening of the heterocycle-bridged iodonium species. For an exclusive set of dicationic