Metal-free synthesis of benzimidazo[1,2-c]quinazolin-6-ones with indole and benzenediamine oxidized by I2/TBHP
作者:Zhen Dai、Songhua Li、Yunyi Li、Lei Feng、Chen Ma
DOI:10.1016/j.tet.2019.02.022
日期:2019.3
A variety of benzimidazo[1,2-c]quinazolin-6-ones derivatives can be accessed in moderate to good yields under simple and metal-free reaction conditions using indoles and o-benzenediamines oxidized by iodine and TBHP. This procedure works in reasonable yields for different indoles as well as o-benzenediamines thus may provide a good synthesis of quinazolinones. A TBHP oxidized ring expansion reaction
Copper-Catalyzed C-C Bond Cleavage/Double Cyclization of α-Ketoamides with o-Phenylene Diamines: Synthesis of Benzimidazo[1,2-<i>c</i>
]quinazolin-6-ones
作者:Liang-Hua Zou、Cheng Yan、Kai Shi、Liang Su、Shuai Zhu、Zhe-Kang Jia、Qiuan Wang
DOI:10.1002/ejoc.201901642
日期:2019.12.19
α‐Ketoamides have been successfully employed to synthesize benzimidazo[1,2‐c]quinazolin‐6‐ones through C–Cbondcleavage/doublecyclization, in which two new C–N and one new C=N bonds are simultaneously formed by copper catalysis under air atmosphere. This new protocol provides an important foundation for the preparation of benzimidazo[1,2‐c]quinazolin‐6‐ones in high yields.
α-酮酰胺已成功用于通过C-C键裂解/双环化反应合成苯并咪唑[1,2 - c ]喹唑啉-6-酮,其中两个新的C–N和一个新的C = N键通过大气气氛下铜的催化作用。该新方案为高产率制备苯并咪唑[1,2 - c ]喹唑啉-6-酮提供了重要的基础。
New methodology for the preparation of quinazoline derivatives via tandem aza-wittig/heterocumulene-mediated annulation. Synthesis of 4(3H)-quinazolinones, benzimidazo[1,2-c] quinazolines, quinazolino[3,2-a]quinazolines and benzothiazolo[3,2-c]quinazolines
作者:Pedro Molina、Mateo Alajarín、Angel Vidal
DOI:10.1016/s0040-4020(01)81321-1
日期:1989.1
2-substituted-4(3H)-quinazolinones . Iminophosphoranes also react with carbon disulfide and carbon dioxide to give the quinazolinones and respectively. Iminophosphorane , derived from 2-(o-azidophenyl)benzimidazole, reacts with isocyanates, carbon disulfide and carbon dioxide to form 6-substituted benzimidazo[1,2-c]quinazolines and respectively. In benzene at room temperature, iminophosphorane , reacts
perceptive and facile approach for the synthesis of new benzo[4,5]imidazo[1,2-c]quinazolin-6(5H)-one derivatives by one-pot two component condensation involving various o-phenylenediamines and substituted isatins in aqueous ethanol at 80 °C. In this methodology, the generation of CN bond and cleavage of CC bond have been conveniently established. This protocol furnishes an alternative route to synthesize
我们已经开发出一种易于理解的方法,可以通过一锅两组分缩合反应合成各种新的苯并[4,5]咪唑并[1,2 - c ]喹唑啉-6(5 H)-one衍生物,该方法涉及各种邻苯二胺和80°C的乙醇水溶液中的取代的靛红。在这种方法中,已经方便地建立了C N键的产生和C C键的断裂。该方案提供了另一种合成苯并[4,5]咪唑并[1,2 - c ]喹唑啉-6(5 H)-的途径。该反应在较短的反应时间内即可提供优异至优异的收率,可用于轻松生成新的生物活性的苯并[4,5]咪唑并[1,2 - c ]喹唑啉-6(5 H)-那些。通过1 H NMR,13 C NMR,FT-IR和XRD确认合成的化合物。