TBHP as Methyl Source under Metal-Free Aerobic Conditions To Synthesize Quinazolin-4(3<i>H</i>
)-ones and Quinazolines by Oxidative Amination of C(sp<sup>3</sup>
)-H Bond
作者:Sushobhan Mukhopadhyay、Dinesh S. Barak、Sanjay Batra
DOI:10.1002/ejoc.201800495
日期:2018.6.15
tert‐Butyl hydroperoxide (TBHP) served as the methylsourceunder metal‐free aerobicconditions in the oxidativeamination of a C(sp3)–Hbond to provide quinazolin‐4(3H)‐one and quinazoline derivatives.
Ultrasound Promoted and Ionic Liquid Catalyzed Cyclocondensation Reaction for the Synthesis of 4(3<i>H</i>)-Quinazolinones
作者:Omprakash B. Pawar、Fulchand R. Chavan、Sachin S. Sakate、Narayan D. Shinde
DOI:10.1002/cjoc.201090037
日期:2010.1
4(3H)‐Quinazolinones were synthesized in high yields by one‐pot three‐component condensation of anthranilic acid, carboxylic acid and aniline in the presence of ionicliquid such as 1‐n‐butyl‐3‐methylimidazolium tetrafluoroborate (BMImBF4) as catalyst under solvent free and neutral conditions.
The one-potsynthesis of quinazolinone derivatives from the reaction of anthranilic acid, trialkyl orthoformate and amines in the presence of lanthanum(III) nitrate hexahydrate or p-toluenesulfonic acid has been carried out. The reaction occurred in a few minutes undersolvent-freeconditions and in excellent yields.
An efficient synthesis of substituted quinazolin-4(3H)-ones by a one-pot ligand-free CuI-catalyzed coupling/condensative cyclization under mild conditions is described. Our study provides an alternative strategy for the preparation of biologically active quinazolin-4(3H)-ones.
Yb(OTf)<sub>3</sub>-CatalyzedOne-Pot Synthesis of Quinazolin-4(3<i>H</i>)-onesfrom Anthranilic Acid, Amines and Ortho Esters (or FormicAcid) in Solvent-Free Conditions
作者:Limin Wang、Jianjun Xia、Fang Qin、Changtao Qian、Jie Sun
DOI:10.1055/s-2003-39397
日期:——
An efficientsynthesis of an array of quinazolin-4(3 H)- ones from anthranilic acid, ortho esters (or formic acid) and amines using Yb(OTf)3 in one-pot undersolvent-freeconditions is de- scribed. Compared with the classical reactionconditions, this new synthetic method has the advantage of excellent yields (75-99%), shorter reaction time (few minutes) and reusability of the catalyst.