Oligosubstituted Pyrroles Directly from Substituted Methyl Isocyanides and Acetylenes
作者:Alexander V. Lygin、Oleg V. Larionov、Vadim S. Korotkov、Armin de Meijere
DOI:10.1002/chem.200801395
日期:2009.1
methyl isocyanides 1 onto the triple bond of electron‐deficient acetylenes 2 represents a direct and convenient approach to oligosubstituted pyrroles 3. The scope and limitations of this reaction (24 examples, 25–97 % yield) are reported along with an optimization of the reaction conditions and a rationalization of the mechanism. In addition, a related newly developed CuI‐mediated synthesis of 2,3‐disubstituted
α-金属化甲基异氰酸酯1在缺电子乙炔2的三键上的正式环加成反应是低取代吡咯3的直接便捷方法。报道了该反应的范围和局限性(24个实例,产率为25-97%),以及对反应条件的优化和机理的合理化。此外,还描述了相关的新开发的Cu I介导的,由未活化的末端炔烃衍生的乙炔铜与取代的甲基异氰酸酯反应的2,3-二取代的吡咯的合成方法(11个实例,产率为5-88%)。