为环外β-烯胺酮的分子内环化一个高效和灵活的协议已经公开了carbazolones和咪唑并[1,2的合成一个]吡啶通过高价碘促进的抗衡阴离子控制自由基机理(III) 。HTIB和AgSbF 6的协同行为在通过CC和CN键形成所需的分子内环化过程中起着至关重要的作用。机械学的见解表明,系统中涉及的两个竞争性反应是由抗衡阴离子的性质决定的,抗衡阴离子的性质决定了最终产物的形成。制备并分离了各种咔唑酮和咪唑并[1,2- a ]吡啶分子,收率良好至极佳。
An Improved Method for the Synthesis of Carbazolones by Palladium/Copper-Catalyzed Intramolecular Annulation of N-Arylenaminones
作者:Jing-Hua Li、Bojie Weng、Rui Liu
DOI:10.1055/s-0030-1258141
日期:2010.9
via the condensation of arylamines with 1,3-cyclodiketones followed by intramolecular oxidative cyclization catalyzed by palladium acetate and copper acetate in ethanol under an oxygen atmosphere was established. The improved method has the advantage of easily available starting materials and affords good yields. carbazolones - intramolecular oxidative cyclization - oxygen - palladium acetate- copper
We described an Rhodium(III)-catalyzed divergent C−H bond functionalization of N-aryl amidines with iodonium ylides. Carbazolones and zwitterionic salts were diversely constructed through intermolecular annulation and intramolecular proton transfer under the different reaction conditions. This protocol is operationally simple and tolerates a variety of functional groups. The efficient post-modification
Aggregative activation and heterocyclic chemistry I complex bases promoted arynic cyclisation of imines or enaminoketones; regiochemical synthesis of indoles
The complex base NaNH2-t-BuONa allowed expeditious syntheses of indoles by arynic cyclisation of imines or enaminoketones prepared from halogeno anilines and carbonyl derivatives. Unstable imines may be used without purification, complex bases being unsensitive to impurities. It is showed that this kind of reaction may be applied to mixture of substrates suitably halogenated on the benzene ring. Formation of three components aggregates is proposed to explain a number of observations.
Wang, Huey-Min; Chou, Hui-Ling; Chen, Ling-Ching, Journal of the Chinese Chemical Society, 1995, vol. 42, # 3, p. 593 - 596