A recyclable palladium-catalyzed modified Friedländer quinoline synthesis
作者:Chan Sik Cho、Wen Xiu Ren
DOI:10.1016/j.jorganchem.2007.06.022
日期:2007.9
2-Aminobenzyl alcohol reacts with an array of ketones in toluene/poly(ethylene glycol) (PEG-2000) at 100 °C in the presence of a palladium catalyst along with KOH under an atmosphere of air to give the corresponding quinolines in good yields. The catalytic system could be recovered and reused five times without any loss of catalytic activity.
The α-alkylation of ketones using an earth-abundant and nonprecious NiBr2/L1 system is reported. This nickel-catalyzed reaction could be performed in gram scale and successfully applied in the synthesis of donepezil (Alzheimer’s drug) and functionalization of steroid hormones and fatty acid derivatives. Synthesis of N-heterocycles, methylation of ketones, and one-pot double alkylation to bis-hetero
An N-heterocyclic carbene-catalyzed approach to the indirect Friedländer quinoline synthesis
作者:Yanfang Zhu、Chun Cai
DOI:10.1039/c4ra07858f
日期:——
Quinolines have been obtained through the indirect Friendländer annulation starting from 2-aminobenzyl alcohol or derivatives from it and ketones catalyzed by N-heterocyclic carbene, and the synthesis of polysubstituted quinolines through a one-pot, two-step tandem reaction starting from readily available ketones and alcohols via alpha-alkylation and indirectFriedländer annulation under air also has
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.
Preparation of 2-arylquinolines from β-arylpropionitriles with aryllithiums and NIS through iminyl radical-mediated cyclization
作者:Hiroki Naruto、Hideo Togo
DOI:10.1039/c9ob00944b
日期:——
Treatment of β-arylpropionitriles with aryllithiums, followed by the reaction with water and then with NIS under irradiation with a tungsten lamp gave 2-arylquinolines in good to moderate yields. The present reaction proceeds through the formation of N-iodoimines from imines with NIS, the generation of imino-nitrogen-centered radicals, and their cyclization onto the aromatic rings of the imines to