Penta-substituted pyrrole derivatives, including a three-membered ring (5-azaspiro[2.4]heptan), were readily prepared in moderate to excellent yields by the Pd-catalyzed intramolecular cyclization reaction of alkynyl carboxamide compounds. When an excess amount of ZnCl2 acted as a Lewis acid and a source of halide, the one-pot bi-metallic system could afford more valuable penta-substituted chloroethyl
摘要 五取代的
吡咯衍
生物,包括一个三元环(
5-氮杂螺[2.4]庚烷),很容易通过
钯催化的炔基甲酰胺化合物的分子内环化反应以中等至优异的产率制备。当过量的 ZnCl2 作为
路易斯酸和卤化物源时,一锅双
金属系统可以在类似条件下提供更有价值的五取代
氯乙基
吡咯产品。这表明本方法是制备范围广泛的官能化和多取代
吡咯的有力工具。图形概要