An efficient catalytic method for the Friedländer annulation mediated by peptide coupling agent propylphosphonic anhydride (T3P®)
摘要:
We have demonstrated the utilization of T3P, a mild and low toxic peptide coupling agent, as a promoter and water scavenger in the Friedlander annulation, and thus introduced a highly efficient catalytic process to access carbocyclic and heterocyclic fused quinolines under microwave irradiation or a conventional heating technique. The reaction conditions are sufficiently mild to tolerate the acid and base sensitive functional groups that can serve as levers for further extension of the quinoline products. (C) 2011 Elsevier Ltd. All rights reserved.
Furo-, Pyrano- und Oxepino-chinoline sowie deren Schwefel-Analoga
作者:G. Kempter、P. Zänker、H.-D. Zürner
DOI:10.1002/ardp.19673001005
日期:——
Aus aromatischen o‐Amino‐ketonen und heterocyclischen Ringketonen, die in 3‐ bzw. 4‐Stellung zur Carbonylgruppe Sauerstoff bzw. Schwefel enthalten, werden heterocyclisch b‐kondensierte Chinoline hergestellt.
Copper-Catalyzed Reactions of Alkenyl Boronic Esters via Chan–Evans–Lam Coupling/Annulation Cascades: Substrate Selective Synthesis of Dihydroquinazolin-4-ones and Polysubstituted Quinolines
作者:Yuge Li、Zifeng Cao、Zhijun Wang、Liang Xu、Yu Wei
DOI:10.1021/acs.orglett.2c02522
日期:2022.9.16
nucleophiles have been established, providing new approaches for one-pot assembly of azacycles. Following the Chan–Evans–Lam C–N couplings, the cyclization processes occur via divergent pathways based on the utilized substrates, affording hydroamination product dihydroquinazolin-4-ones or aromatization product quinolines. Via this one-pot C–N coupling/annulation cascade, the target substituted azacycles can