Convenient Method for the Preparation of the 2-Methyl Thiophen-3-yl Magnesium Bromide Lithium Chloride Complex and Its Application to the Synthesis of 3-Substituted 2-Methylthiophenes
作者:Masakazu Kogami、Nobuhide Watanabe
DOI:10.1080/00397911.2011.606391
日期:2013.1.1
formation of the Grignard reagent from inactive 3-bromo-2-methylthiophene (1) and commercial magnesium metal. Based on this finding, a convenient and potentially scalable preparation of ethyl 2-methylthiophene-3-carboxylate (3) was achieved. In addition, this process has been found to provide a new, general approach to 3-substituted 2-methylthiophenes. GRAPHICAL ABSTRACT
摘要 氯化锂被发现可加速非活性 3-溴-2-甲基噻吩 (1) 和商业镁金属形成格氏试剂。基于这一发现,实现了 2-甲基噻吩-3-羧酸乙酯 (3) 的方便且潜在可扩展的制备。此外,已发现该方法为 3-取代的 2-甲基噻吩提供了一种新的通用方法。图形概要