Catalyst-Free [3 + 3] Annulation/Oxidation of Cyclic Amidines with Activated Olefins: When the Substrate Olefin Is Also an Oxidant
作者:Wendan Han、Yuanhang Li、Kaki Raveendra Babu、Jing Li、Yuhai Tang、Yong Wu、Silong Xu
DOI:10.1021/acs.joc.1c00717
日期:2021.6.4
DBN (1,5-diazabicyclo(4.3.0)non-5-ene) with activated olefins, i.e., 2-arylidenemalononitriles and 2-cyano-3-aryl acrylates, to afford tricyclic 2-pyridones and pyridin-2(1H)-imines, respectively. The mechanism has been proposed based on DFT calculations. In the reaction, the cyclic amidines serve as C,N-bisnucleophiles for the cyclization, while the olefins play a dual role by acting as both reactants
在此,我们描述了环脒如 DBU(1,8-二氮杂双环(5.4.0)undec-7-ene)和 DBN(1,5-二氮杂双环(4.3 .0)non-5-ene)与活化的烯烃,即2-亚芳基丙二腈和2-氰基-3-芳基丙烯酸酯,分别提供三环2-吡啶酮和吡啶-2(1 H )-亚胺。该机制是基于 DFT 计算提出的。在反应中,环脒作为环化的C,N-双亲核试剂,而烯烃通过作为反应物和氧化剂发挥双重作用。