Rh(III)-Catalyzed C–H Activation/Cyclization of Indoles and Pyrroles: Divergent Synthesis of Heterocycles
作者:Yan Zhang、Jing Zheng、Sunliang Cui
DOI:10.1021/jo500902n
日期:2014.7.18
activation/cyclization of indoles and pyrroles, for the divergent synthesis of privileged heterocycles. A simple derivation of indoles and pyrroles to N-carboxamides with oxidative bidentate directing group could enable rhodacycle formation and late-stage redox-neutral cyclization with alkynes, alkenes and diazo compounds, for access to five- and six-membered fused heterocycles, such as pyrimido[1,6-a]indol-1(2H)-one
我们在这里报告了Rh(III)催化吲哚和吡咯的CH活化/环化的新策略,用于特权杂环的发散合成。带有氧化性双齿引导基团的吲哚和吡咯基简单地衍生为N-羧酰胺可以实现Rhodacycle的形成以及后期的炔烃,烯烃和重氮化合物的氧化还原中性环化反应,从而获得五元和六元稠合杂环,例如pyrimido [1,6- a ]吲哚-1(2 H)-one,3,4-dihydropyrimidoido [1,6- a ] indol-1(2 H)-one和1 H-咪唑并[1,5- a ]吲哚-3(2 H)-那些。进行了动力学同位素效应研究,并提出了合理的机理。此外,该方案适用于克规模的简明合成5-HT3受体拮抗剂。