Copper‐Catalyzed Selective Pyrrole Functionalization by Carbene Transfer Reaction
作者:Anabel M. Rodríguez、Francisco Molina、M. Mar Díaz‐Requejo、Pedro J. Pérez
DOI:10.1002/adsc.201901629
日期:2020.5.12
incorporation of carbene groups from diazo compounds, in a process catalyzed by TpxCu complexes (Tpx=hydrotrispyrazolylborate ligand). The reactions take place with a complete selectivity toward the formal insertion of the carbene into the Cα−H bond, leading to alkylated pyrroles, with no modification of the Cβ−H, N−H or C=C bonds of the pyrrole unit. Alkyl substituents at C‐ring as well as alkyl, aryl, allyl
1 H-吡咯可以通过在Tp x Cu络合物(Tp x =氢三吡唑基硼酸酯配体)催化下,通过重氮化合物中的卡宾基团的引入直接官能化。该反应发生朝向卡宾到C的正式插入一个完整的选择性α -H键,导致烷基化吡咯,与C的没有修饰β -H,N-H或吡咯单元的C = C键。可以容忍C环上的烷基取代基以及N原子上的烷基,芳基,烯丙基或炔烃取代基,该策略可提供20种新的吡咯衍生物。当添加D 2进行反应时,观察到亚甲基部分氘化O起到丢弃卡宾基团直接插入C sp 2 -H键的作用,对吡咯环的替代亲电攻击是可行的。