Palladium-Catalyzed and Quinazoline-Directed C–H Selective Acetoxylation of 2-Arylquinazolines
作者:Yiyuan Peng、Song Wei、Banlai Ouyang、Zhihong Deng、Qin Yang
DOI:10.1055/s-0037-1611908
日期:2019.10
successfully synthesized via the Pd-catalyzed and quinazoline-directed C–H activation/acetoxylation of the corresponding 2-arylquinazolines with iodobenzene diacetate in AcOH/Ac2O. A series of acetoxylated 2-arylquinazolines have been successfully synthesized via the Pd-catalyzed and quinazoline-directed C–H activation/acetoxylation of the corresponding 2-arylquinazolines with iodobenzene diacetate in AcOH/Ac2O
抽象的 通过在相应的2-芳基喹唑啉在AcOH / Ac 2 O中用碘代苯二乙酸酯进行Pd催化和喹唑啉定向的CH活化/乙酰氧基化,已成功合成了一系列乙酰氧基化的2-芳基喹唑啉。 通过在相应的2-芳基喹唑啉在AcOH / Ac 2 O中用碘代苯二乙酸酯进行Pd催化和喹唑啉定向的CH活化/乙酰氧基化,已成功合成了一系列乙酰氧基化的2-芳基喹唑啉。
Design, Synthesis and Molecular Properties Prediction of Novel Quinazoline Derivatives as Potent Antibacterial Agents
A novel series of compounds were synthesized by C-C bond formation of substituted quinazolinones (1) with substituted boronic acids (2) to get 2,4-disubstituted quinazoline (3a-3n) in good to excellent yields. The structures of the new compounds were confirmed by IR, 1H NMR, 13C NMR and mass spectral data. An antibacterial and antifungal activity screening results showed that compounds 3b, 3e, 3i and 3l possess excellent activity against Gram (+), Gram (-) bacteria (S. aureus, Klebsiella species, P. aeruginosa) compared to standard drugs. 3l, 3g and 3n showed better antifungal activity against A. nigeri and C. albicans organisms. In this investigation, the target compounds 3a-3n were subjected to in silico molecular properties prediction and drug likeness by employing Molinspiration (Molinspiration, 2014) and MolSoft (MolSoft, 2007) property explorer tool kits for predicting their high oral bioavailability.
An efficient route to 4-arylquinazolines via arylation of quinazolin-4-ones under mild condition is described. The reaction is carried out by the palladium-catalyzed coupling of quinazolin-4-ones with arylboronic acids in the presence of TsCl leading to 4-arylquinazolines in good to excellent yields.
Ru(II)-Catalyzed C–H Activation and Annulation Reaction via Carbon–Carbon Triple Bond Cleavage
作者:Rashmi Prakash、Bidisha R. Bora、Romesh C. Boruah、Sanjib Gogoi
DOI:10.1021/acs.orglett.8b00643
日期:2018.4.20
An unprecedented Ru(II)-catalyzed C–H activation and annulation reaction, which proceeds via C–C triple bond cleavage, is reported. This reaction of 2-phenyldihydrophthalazinediones with alkynes, which works most efficiently in the presence of bidented ligand 1,3-bis(diphenylphosphino)propane, affords good yields of substituted quinazolines.