Intramolecular Imino Diels−Alder Reaction: Progress toward the Synthesis of Uncialamycin
作者:Sandy Desrat、Pierre van de Weghe
DOI:10.1021/jo901291t
日期:2009.9.4
We herein described an intramoleculariminoDiels−Alderreaction promoted with BF3·OEt2/DDQ affording substituted quinolines. Using this procedure, we prepared the chiral quinoline moiety of the uncialamycin, a new enediyne natural product.
Oxone promoted dehydrogenative Povarov cyclization of <i>N</i>-aryl glycine derivatives: an approach towards quinoline fused lactones and lactams
作者:Devidas A. More、Ganesh H. Shinde、Aslam C. Shaikh、M. Muthukrishnan
DOI:10.1039/c9ra06212b
日期:——
Oxone promoted intramolecular dehydrogenative imino Diels–Alderreaction (Povarov cyclization) of alkyne tethered N-aryl glycine esters and amides has been explored, thus affording biologically significant quinoline fused lactones and lactams. The reaction is simple, scalable, and high yielding (up to 88%). The method was further extended to prepare biologically important luotonin-A analogues and the
Oxidative Tandem Cyclization of Glycine Esters with Propargyl Alcohols
作者:Tongzhi Sang、Jia Liang、Songhai Huang、Guozhe Guo、Jie Yang、Xiazhen Bao、Congde Huo
DOI:10.1021/acs.joc.3c00627
日期:2023.7.21
A facile and efficient aerobic oxidative (4 + 2)-cyclization/aromatization/lactonization tandemreaction of N-aryl glycine esters with propargyl alcohols to access quinoline-fused lactones is reported. The reaction can be extended to homopropargylic alcohols too. The transformation is straightforward to perform under mild conditions and scalable, and both reaction components are readily available.
A direct construction of quinoline-fused lactones and lactams was achieved by sp(3) C-H bond oxidation of N-aryl glycine esters and amides under catalytic radical cation salt-induced conditions. These polycyclic products are formed in a single step from readily accessible starting materials, and this method provides a new synthetic approach to this class of heterocycles.