Quinazoline-directed selective ortho-iodination for the synthesis of 2-(2-iodoaryl)-4-arylquinazolines
摘要:
Palladium-catalyzed ortho-iodination of 2, 4-diarylquinazolines via C-H activation is described. These palladium catalytic quinazoline-directed mono-iodination reactions are very efficient, highly selective and with a broad substrate scope, producing the corresponding 2-(2-iodoaryl)-4-arylquinazolines with good yields. (C) 2017 Published by Elsevier B.V.
Lewis-Acid-Catalysed Activation of Nitriles: A Microwave-Assisted Solvent-Free Synthesis of 2,4-Disubstituted Quinazolines and 1,3-Diazaspiro[5.5]undec-1-enes
A single‐step, solvent‐free, and transition‐metal‐free reaction for the synthesis of quinazolines/quinazolinones starting from 2‐amino carbonyl compounds, and of 1,3‐diazaspiro[5.5]undec‐1‐ene derivatives starting from N‐tosyl‐2‐(cyclohexenyl)ethylamines, is reported. The Lewis‐acid‐catalysed activation of nitriles is a key feature of this reaction.
The first example of the palladium-catalyzed, three-component tandem reaction of 2-aminobenzonitriles, aldehydes, and arylboronic acids has been developed, providing a new approach for one-pot assembly of diverse quinazolines in moderate to good yields. A noteworthy feature of this method is the tolerance of bromo and iodo groups, which affords versatility for further synthetic manipulations. Preliminary
A novel and efficient methodology for the construction of quinazolines based on supported copper oxide nanoparticles
作者:Jintang Zhang、Chenmin Yu、Sujing Wang、Changfeng Wan、Zhiyong Wang
DOI:10.1039/c002454f
日期:——
A series of quinazolines were synthesized from 2-aminobenzophenones and benzylic amines in good to excellent yields by employing a new heterogeneous catalyst based on the copper oxide nanoparticles supported on kaolin.
Ru(II)-Catalyzed C–H Activation and Annulation Reaction via Carbon–Carbon Triple Bond Cleavage
作者:Rashmi Prakash、Bidisha R. Bora、Romesh C. Boruah、Sanjib Gogoi
DOI:10.1021/acs.orglett.8b00643
日期:2018.4.20
An unprecedented Ru(II)-catalyzed C–H activation and annulation reaction, which proceeds via C–C triple bond cleavage, is reported. This reaction of 2-phenyldihydrophthalazinediones with alkynes, which works most efficiently in the presence of bidented ligand 1,3-bis(diphenylphosphino)propane, affords good yields of substituted quinazolines.
The first Pd/C‐catalyzedoxidative C(sp3)−H bond amination of o‐nitroacetophenones with benzylamines or amino acids proceeding through C−N bond cleavage followed by C−N bond formation by a hydrogen‐transfer strategy was developed. These transformations proceeded smoothly in water to afford the desired quinazolines in moderate to good yields. This protocol has a broad substrate scope and good tolerance