A convenient palladium-catalyzed carbonylative synthesis of 4(3H)-quinazolinones from 2-bromoformanilides and organo nitros with Mo(CO)<sub>6</sub> as a multiple promoter
A novel and convenient procedure for the synthesis of quinazolinones has been developed. Using 2-bromoformanilides and organo nitros as substrates and Mo(CO)6 as a multiple promoter, the desired products were isolated in moderate to excellent yields in the presence of a palladium catalyst. Here, Mo(CO)6 was not only a CO source, but also a nitro compound reducing reagent and a cyclization promoter
α-Hydroxy acid as an aldehyde surrogate: metal-free synthesis of pyrrolo[1,2-<i>a</i>]quinoxalines, quinazolinones, and other N-heterocycles <i>via</i> decarboxylative oxidative annulation reaction
and efficient procedure for the synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and indolo[1,2-a]quinoxaline has been developed. The key features of our method include the in situ generation of aldehyde from α-hydroxy acid in the presence of TBHP (tert-butyl hydrogen peroxide), and further condensation with various amines, followed by intramolecular cyclization and subsequent oxidation to afford
开发了一种无金属且有效的合成吡咯并[1,2- a ]喹喔啉、喹唑啉酮和吲哚[1,2- a ]喹喔啉的方法。该方法的主要特点包括在 TBHP(叔丁基过氧化氢)存在下,由 α-羟基酸原位生成醛,并与各种胺进一步缩合,然后进行分子内环化和随后的氧化,得到相应的喹喔啉、喹唑啉酮衍生物,产率中等至高。
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.
Synthesis of 3,4‐Dihydropyrimidine‐2(1<i>H</i>)‐thiones and Quinazolin‐4(3<i>H</i>)‐ones over Yb(III)‐Resin Catalyst Under Solvent‐free Conditions
作者:Zhidong Jiang、Ruifang Chen
DOI:10.1081/scc-200049766
日期:2005.3
reagent supported on ion exchange resin is applied to the multicomponent condensation reactions under solvent‐freeconditions. One‐pot synthesis of a library of 3,4‐dihydropyrimidine‐2(1H)‐thiones and quinazolin‐4(3H)‐ones were described. The advantages of easy separation and recyclability of the catalysts were demonstrated.
One-pot Synthesis of Substituted Quinazolin-4(3H)-ones under Microwave Irradiation
作者:Kurosh Rad-Moghadam、Mohammad S. Khajavi
DOI:10.1039/a802853b
日期:——
Synthesis of the title compounds by cyclocondensation of anthranilic acid, formic acid (or orthoesters) and an amine in one pot under microwave irradiation takes place in a few minutes.