Palladium(II)-Catalyzed Tandem Cyclization/C–H Functionalization of Alkynes for the Synthesis of Functionalized Indoles
摘要:
A palladium-catalyzed tandem cyclization/C-H functionalization of two alkynes was accomplished to construct a series of polycyclic functionalized indoles. A range of internal alkynes bearing synthetically useful functional groups were tolerated. A good regioselectivity was observed when alkyl-substituted alkynes were introduced into the reaction system, and a single product was obtained. Molecular oxygen was used as the terminal oxidant in the approach, rendering the reaction more sustainable.
Synthesis of Benzo[a]carbazoles and Dibenzo[c,g]carbazoles via Sequential Gold Catalysis and Photomediated Cyclization
作者:Lijun Zhang、Zhuo Wang、Zhiguang Song
DOI:10.1021/acs.joc.4c00746
日期:2024.6.21
benzo[a]carbazole and dibenzo[c,g]carbazole frameworks. The detailed gold catalytic reaction conditions developed for the challenging intermolecular carbon nucleophilic addition to internal alkynes are realized, giving the desired alkyne hydroarylation products in good yields. The resulting trisubstituted alkenes are able to undergo photomediated cyclization, furnishing the desired carbazole molecules
在此,我们报告了构建苯并[ a ]咔唑和二苯并[ c , g ]咔唑框架的反应方案。实现了为内部炔烃进行具有挑战性的分子间碳亲核加成而开发的详细金催化反应条件,以良好的收率得到了所需的炔烃加氢芳基化产物。所得三取代烯烃能够进行光介导环化,以优异的产率和高效率提供所需的咔唑分子。