首次将TsOH·H 2 O / O 2和适当的双亲核试剂组合使用,将醇和醚确定为可持续的次甲基来源,用于合成喹唑啉酮和苯并咪唑衍生物。氘标记研究清楚地证明了合成杂环的C 2氢来自次甲基。这些独特的反应条件已成功地用于合成棘金龙酮(2e'),2f'(rutaecarpine和(±)evodiamine的常见前体)和二咪唑(6d)。该方法的显着特征包括低毒性,使用商业原料作为底物,成本低,对官能团的耐受性强以及对多种双亲核起始原料的适用性。
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.
<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。
Metal-free oxidative synthesis of quinazolinones via dual amination of sp<sup>3</sup> C–H bonds
作者:Dan Zhao、Teng Wang、Jian-Xin Li
DOI:10.1039/c4cc02648a
日期:——
A novel metal-free synthesis of quinazolinones via dual amination of sp3 C–H bonds was developed. The sp3 carbon in methylarenes or adjacent to a heteroatom in DMSO, DMF or DMA was used as the one carbon synthon.
Pd/C as an efficient heterogeneous catalyst for carbonylative four-component synthesis of 4(3H)-quinazolinones
作者:Kishore Natte、Helfried Neumann、Xiao-Feng Wu
DOI:10.1039/c5cy00907c
日期:——
activated charcoal (Pd/C) as a heterogeneous catalyst was investigated for the carbonylation of 2-iodoanilines with trimethyl orthoformate and amines via a multicomponent reaction approach, which provided excellent yields of 4(3H)-quinazolinones. It avoids the use of expensive phosphine ligands with an additional advantage of catalyst recovery. Furthermore, >5 new quinazolinone scaffolds containing the trifluoroethyl
Copper-promoted N-arylation of quinazolin-4(3H)-ones with boronic acid at room temperature in the presence of air has been investigated. This method is general and can be applied to synthesizing derivatives of quinazolin-4(3H)-one with medicinal values.