A convenient and efficient synthesis of substituted quinolines via a simple one-pot reaction of an aniline, an aromatic aldehyde, and an enolizable aliphatic aldehyde in the presence of the iridium catalyst [IrCl2H(cod)]2 under oxygen as an oxidant was developed. The reaction proceeds with Mannich-type imine formation followed by nucleophilic addition to give β-amino aldehydes. Dehydrative cyclization takes place to give dihydroquinoline, which is then dehydrogenated by aerobic oxidation to give 2-aryl-3-alkylquinolines. Dialkylquinolines were obtained by the reaction with anilines and aliphatic aldehydes in good yields.
A convenient and efficient synthesis of substituted quinolines in a simple one-pot reaction of an arylamine 1, an aromatic aldehyde or aliphatic aldehyde 2 and an aliphatic aldehyde 3 in the presence of transition metal complexes or Lewis acids was developed. Among them, the iridium catalyst [Ir(cod)Cl] 2 catalyzed the reaction most efficiently.
Reaction behaviour of arylamines with nitroalkenes in the presence of bismuth(<scp>iii</scp>) triflate: an easy access to 2,3-dialkylquinolines
作者:Saghir Ali、Radhakrishna Gattu、Varun Singh、Santa Mondal、Abu T. Khan、Gurudutt Dubey、P. V. Bharatam
DOI:10.1039/c9ob02214g
日期:——
We report the reaction behaviour of arylamines with nitroalkenes in the presence of bismuth(iii) triflate (10 mol%) and diacetoxyiodobenzene (10 mol%). We obtained 2,3-dialkylquinoline derivatives instead of the expected 3-alkylindole derivatives. The present reaction is an alternative approach for the synthesis of 2,3-dialkylquinoline derivatives under milder conditions. Furthermore, we establish
Synthesis of Substituted Quinolines from Arylamines and Aldehydes via Tandem Reaction Promoted by Chlorotrimethylsilane
作者:Xiaoqin Bian、Lanhai Liu、Xin Geng、Zengyang Xie、Shuangshuang Li、Cunde Wang
DOI:10.3184/030823409x401835
日期:2009.2
Substituted quinolines were effectively synthesised by utilising chlorotrimethylsilane (TMSCl) as an efficient catalyst in the cyclisation condensation of aromatic amines and enolisable aldehydes via a tandem process in air and DMSO. The clean, mild reaction conditions, operational simplicity and high yields were attractive features of the reaction which enables a facile preparative procedure for building
Synthesis of 2,3-disubstituted quinolines from in situ generated imines and its enamine tautomer under radical cation induced conditions
作者:Xiaodong Jia、Fangfang Peng、Chang Qing、Congde Huo、Yaxin Wang、Xicun Wang
DOI:10.1016/j.tetlet.2013.07.014
日期:2013.9
A tandem cyclization/aromatization of anilines and aldehydes was achieved under catalytic radicalcation salt induced conditions, producing a series of 2,3-disubstituted quinolines in good yields. In this reaction, the in situ generated imine tautomerizes to enamine, which acts as a dienophile to participate in the tandem cyclization, and further elimination of the anilino group triggers the aromatization