Manganese-Catalyzed [4 + 2] Annulation of N–H Amidines with Vinylene Carbonate via C–H Activation
作者:Yudong Li、Huan Wang、Ying Li、Yang Li、Yuxia Sun、Chungu Xia、Yuehui Li
DOI:10.1021/acs.joc.1c02473
日期:2021.12.17
Manganese-catalyzed C–H bond functionalization of aryl amidines for the synthesis of 1-aminoisoquinolines in the presence of vinylenecarbonate has been developed. The reaction features a broad substrate scope and proceeds under mild reaction conditions with only the carbonate anion as the byproduct.
Access to highly functionalized imidazolones bearing α-amino acid esters <i>via</i> KOH-promoted annulation of amidines, nitrosoarenes and malonic esters
作者:Wenhui Li、Jie Xin、Pingan Zhai、Jianying Lin、Shuangping Huang、Wenchao Gao、Xing Li
DOI:10.1039/d1ob00930c
日期:——
α-amino acid esters through KOH-mediated one-pot three-component annulation of amidines, nitrosoarenes and malonic esters is reported. This reaction features broad substrate scope, a cheap and readily available promoter, good to high yields for most substrates and mild reaction conditions. The mechanism study shows that the KOH-mediated formation of the imine intermediate via the reaction of nitrosoarenes
Metal‐Free Cascade 1,4‐Conjugate Addition/Selective Annulation Strategy for Divergent Synthesis of Polysubstituted Imidazoles and 4‐Alkenylquinazolines
作者:Qiang Tang、Keke Xu、Xinwei He、Yongjia Shang
DOI:10.1002/adsc.202200905
日期:2022.12.8
metal-free cascade annulation of propagylamines with amidines for divergent synthesis of polysubstituted imidazoles and 4-alkenylquinazolines has been developed. The reaction is believed to proceed by sequential 1,4-conjugate addition of amidines to propargylamines, 5-exo-dig annulation/aromatization to form the polysubstituted imidazoles, and nucleophilic addition/elimination/aromatization to quinazoline
Construction of 1,2-dihydro-1,3,5-triazines <i>via</i> reactions involving amidines
作者:Honghong Guo、Jianying Lin、Qiang Liu、Xing Li
DOI:10.1039/d3ob00283g
日期:——
synthesized through three sets of reactions of amidines with, respectively, paraformaldehyde, aldehydes and N-arylnitrones under different conditions. The catalysts used in these three reactions were Cu(OAc)2, ZnI2 and CuCl2·2H2O, respectively. Most of the substrates tested for these reactions provided the target products in moderate to good yields. In the reactionsinvolving paraformaldehyde, Cu(OAc)2 also