Solvent-dependent metal-free chemoselective synthesis of benzimidazoles and 1,3,5-triarylbenzenes from 2-amino anilines and aryl alkyl ketones catalyzed by I2
作者:Yuxin Ding、Renchao Ma、Yongmin Ma
DOI:10.1016/j.tetlet.2021.153016
日期:2021.4
the synthesis of benzimidazoles and 1,3,5-triarylbenzenes via the annulation of 2-amino anilines and aryl alkyl ketones or the cyclization of aryl alkyl ketones, respectively. With 1,4-dioxane as the solvent, sequential CN bond formation followed by C(CO)-C(CH3) bond cleavage leads to the formation of benzimidazoles in a highly selective manner while aldol-type self-condensation of aryl alkyl ketones
开发了一种溶剂依赖性 I2 催化的化学选择性反应,用于分别通过 2-氨基苯胺和芳基烷基酮的环化或芳基烷基酮的环化合成苯并咪唑和 1,3,5-三芳基苯。以 1,4-二恶烷为溶剂,连续形成 CN 键,然后 C(CO)-C(CH3) 键断裂导致以高选择性方式形成苯并咪唑,而使用 PhNO2 或 PhCl 作为溶剂,芳基烷基酮的醛型自缩合占主导地位,得到 1,3,5-三芳基苯。