Synthesis of Benzimidazoles by PIDA-Promoted Direct C(sp<sup>2</sup>)H Imidation of<i>N</i>-Arylamidines
作者:Jinbo Huang、Yimiao He、Yong Wang、Qiang Zhu
DOI:10.1002/chem.201202271
日期:2012.10.29
A metal‐free synthesis of diversified benzimidazoles from N‐arylamidines through a phenyliodine(III) diacetate (PIDA) promoted intramolecular direct C(sp2)H imidation has been developed. The reaction proceeds smoothly at 0 °C or ambient temperature to provide the desired products in good to excellent yields. The synthesis of 2‐alkyl‐ or 2‐alkyl‐fused benzimidazoles, which are generally inaccessible