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
Transition metal-free C–F/C–Cl/C–C cleavage of ClCF<sub>2</sub>COONa for the synthesis of heterocycles
作者:Yizhe Yan、Chang Cui、Jianyong Wang、Shaoqing Li、Lin Tang、Yanqi Liu
DOI:10.1039/c9ob01641d
日期:——
ClCF2COONa was employed as a C1 synthon for 1,3,5-triazines or quinazolinones in up to 96% yields under transition metal-free and external oxidant-free conditions.
New Strategy for the Synthesis of Heterocycles via Copper-Catalyzed Oxidative Decarboxylative Amination of Glyoxylic Acid
作者:Bin Niu、Shaoqing Li、Chang Cui、Yizhe Yan、Lin Tang、Jianyong Wang
DOI:10.1002/ejoc.201901538
日期:2019.12.31
A copper‐catalyzed oxidative decarboxylative amination of glyoxylic acid with substrates having two nitrogen‐nucleophilic sites was first demonstrated, affording 1,3,5‐triazines, quinazolinones and quinazolines in up to 93 % yields.
<i>N</i>,<i>N</i>-Dimethylformamide as Carbon Synthons for the Synthesis of <i>N</i>-Heterocycles: Pyrrolo/Indolo[1,2-<i>a</i>]quinoxalines and Quinazolin-4-ones
作者:Shichen Li、Jianing Ren、Chengcheng Ding、Yishou Wang、Chen Ma
DOI:10.1021/acs.joc.1c02067
日期:2021.12.3
N-dimethylformamide (DMF) as synthetic precursors contributing especially the methyl, acyl, and amino groups has played a significant role in heterocycle syntheses and functionalization. In this protocol, a wide range of pyrrolo/indolo[1,2-a]quinoxalines and quinazolin-4-ones were obtained in moderate to good yields by using elemental iodine without any metal or peroxides. We considered that N-methyl and
N , N-二甲基甲酰胺 (DMF) 作为合成前体,尤其是甲基、酰基和氨基,在杂环合成和功能化中发挥了重要作用。在该协议中,通过使用不含任何金属或过氧化物的元素碘,以中等至良好的收率获得了范围广泛的 pyrrolo/indolo[1,2 - a ]quinoxalines 和 quinazolin-4-ones。我们认为DMF的N-甲基和N-酰基通过不同的机理分别参与并完成反应,这表明DMF的潜力仍有待探索。
Highly Efficient Four-Component Synthesis of 4(3<i>H</i>)-Quinazolinones: Palladium-Catalyzed Carbonylative Coupling Reactions
Given the importance of quinazolinones and carbonylative transformations, a palladium‐catalyzed four‐component carbonylativecoupling system for the synthesis of diverse 4(3H)‐quinazolinone in a concise and convergent fashion has been developed. Starting from 2‐bromoanilines (1 mmol), trimethyl orthoformate (2 mmol), and amines (1.1 mmol), under 10 bar of CO, the desired products were isolated in good