Oxidative Radical Skeletal Rearrangement Induced by Molecular Oxygen: Synthesis of Quinazolinones
作者:Yi-Feng Wang、Feng-Lian Zhang、Shunsuke Chiba
DOI:10.1021/ol4011745
日期:2013.6.7
Oxidative skeletal rearrangement of 5-aryl-4,5-dihydro-1,2,4-oxadiazoles into quinazolinones is induced by molecularoxygen (under a dry air atmosphere) that likely proceeds via transient iminyl radical species. Concise syntheses of biologically active quinazolinone derivatives were demonstrated using the present strategy.
Efficient one-pot tandem synthesis and cytotoxicity evaluation of 2,3-disubstituted quinazolin-4(3H)-one derivatives
作者:Hue Thi Buu Bui、Kiep Minh Do、Huy Tran Duc Nguyen、Hieu Van Mai、Thanh La Duc Danh、De Quang Tran、Hiroyuki Morita
DOI:10.1016/j.tet.2021.132426
日期:2021.10
moderate to good yields (25–82%). Their syntheses were based on a one pot tandem ring opening procedure followed by iodine-catalyzed oxidative cyclization of isatoic anhydride with aldehydes, using water as the only solvent under both classical and microwaveirradiation conditions. Cytotoxicity assays of the prepared compounds against three human cancer cell lines (HeLa, MCF-7, and A549) indicated that 2
Functionalized Carbodiimide Mediated Synthesis of 2,3-Disubstituted Quinazolin-4(3H)-ones via the Tandem Strategy of C-Nucleophilic Addition and Intramolecular NH-Substitution Cyclization
作者:Takao Saito、Hayato Nakano、Noriki Kutsumura
DOI:10.1055/s-0032-1316773
日期:——
moiety at the proximal estergroup. A facile synthesis of quinazolin-4(3H)-ones possessing carbon substituents at positions 2 and 3 has been developed. Key to the synthesis is a tandem strategy involving introduction of a 2-substituent and construction of the quinazolinone framework via C-nucleophilic addition to the carbodiimide cumulenic carbon followed by intramolecular nucleophilic substitution by
Readily available N-substituted amides or their requisite carboxylicacids or acidchlorides have been used to construct 2,3-disubstituted-3H-quinazolin-4-ones in a one-pot procedure. Key transformation in this convergent approach involves Ph3P–I2-mediated formation of amidine upon condensation of an amide or the intermediate amide with methyl anthranilate. Cyclization of the amidine-tethered anthranilate
Dirhodium(II) acetate‐catalyzed reactions of N‐tosylhydrazones with dihydroquinazolinones bearing different types of NHbonds that give N3‐benzyl/alkyl‐2‐arylquinazolin‐4(3H)‐ones through Csp3N bond formation by oxidative dehydrogenation and insertion of rhodium‐carbenoid into amide NH bond are reported for the first time. This method features good to excellent yields, good functional group tolerance