Palladium-Catalyzed Cycloaddition of Alkynylimines, Double Isocyanides, and H<sub>2</sub>O/KOAc
作者:Dianpeng Chen、Min Yang、Jianming Li、Peiying Cui、Lei Su、Yingying Shan、Jinmao You、Pornchai Rojsitthisak、Jin-Biao Liu、Guanyinsheng Qiu
DOI:10.1021/acs.joc.0c00323
日期:2020.5.15
cyclization of alkynylimines and double isocyanides is described. This facile procedure is efficient for synthesizing various 4-amidyl-2-aminopyrroles. Mechanism investigation indicates that a four-membered ring-fused pyrrole species is a key intermediate and the reaction involves [4 + 1] cycloaddition, protonation, nucleophilic addition, 1,4-addition of isocyanide, and rearomatization. Interestingly,
在这项工作中,描述了炔催化的钯和双异氰酸酯的钯催化环化。该简便的方法对于合成各种4-ami基-2-氨基吡咯是有效的。机理研究表明,四元环稠合吡咯是一个关键中间体,反应涉及[4 +1]环加成,质子化,亲核加成,异氰酸1,4-加成和重新芳构化。有趣的是,线性二吡咯衍生物被发现是一种合适的氟离子探针,具有显着的发射变化,可作为光电共轭材料的潜在候选者。