Silver-Catalyzed Isocyanide-Alkyne Cycloaddition: A General and Practical Method to Oligosubstituted Pyrroles
作者:Jianquan Liu、Zhongxue Fang、Qian Zhang、Qun Liu、Xihe Bi
DOI:10.1002/anie.201302024
日期:2013.7.1
key: The transition‐metal‐catalyzed cycloaddition of isocyanides and unactivated terminal alkynes has been realized with Ag2CO3 as a unique and robust catalyst (see scheme). The protocol is highly efficient, allowing a broad range of terminal and internal alkynes to react under base‐ and ligand‐free conditions, generating synthetically useful oligosubstituted pyrroles in high yields.
Ag 2 CO 3是关键:Ag 2 CO 3是一种独特而坚固的催化剂,已经实现了过渡金属催化的异氰酸酯和未活化的末端炔烃的环加成反应(参见方案)。该方案非常高效,可以使各种末端和内部炔烃在无碱和无配体的条件下反应,从而以高收率生成合成上有用的寡取代吡咯。