A simple and convenient two-step, one-pot synthesis of hetero-imidazoles from nitroaminoaryls catalyzed by Ytterbium triflate
作者:Fen Wang、Michelle Tran-Dubé、Stephanie Scales、Sarah Johnson、Indrawan McAlpine、Sacha Ninkovic
DOI:10.1016/j.tetlet.2013.05.092
日期:2013.7
A mild two-step one-pot procedure for the conversion of ortho-nitroamino aromatic heterocycles into corresponding benzo and heteroaromatic fused imidazoles is described. The procedure utilizes iron powder, acetic acid, triethylorthoformate, and a catalytic amount of Ytterbium triflate at 75 °C for the nitro group reduction and cyclization reaction. The optimum stoichiometry of each component is highlighted
描述了一种温和的两步一锅法,用于将邻硝基氨基芳族杂环转化为相应的苯并和杂芳族稠合的咪唑。该方法利用铁粉,乙酸,原甲酸三乙酯和75℃催化量的三氟甲磺酸°进行硝基还原和环化反应。突出显示了每种组分的最佳化学计量,并证明了其与众多官能团的高度相容性,具有广泛的用途。