Access to 2‐Arylquinazolin‐4(3H)‐ones through Intramolecular Oxidative C(sp
3
)−H/N−H Cross‐Coupling Mediated by I
2
/DMSO
摘要:
AbstractA novel approach for the synthesis of 2‐arylquinazolin‐4(3H)‐ones was developed. A series of title compounds were obtained with good functional group tolerance and good yields by I2/DMSO‐mediated intramolecular oxidative cross‐coupling of 2‐(benzylamino)benzamides to form C=N double bonds. This method was applicable for gram‐scale synthesis. A proposed reaction pathway based on some control experiments was also provided.
the synthesis of quinazolinones, quinoxalinones, benzooxazinones, and benzothiazoles from the reactions of α-keto acids with 2-aminobenzamides, benzene-1,2-diamines, 2-aminophenols, and 2-aminobenzenethiols, respectively, is described. The reactions were conducted under catalyst-free conditions, using water as the sole solvent with no additive required, and successfully applied to the synthesis of sildenafil
Palladium-Catalyzed Oxidative Three-Component Coupling of Anthranilamides with Isocyanides and Arylboronic Acids: Access to 2,3-Disubstituted Quinazolinones
作者:Chun Qian、Kui Liu、Shou-Wei Tao、Fang-Ling Zhang、Yong-Ming Zhu、Shi-Lin Yang
DOI:10.1021/acs.joc.8b01218
日期:2018.8.17
A novel palladium-catalyzedoxidative three-component coupling of easily accessible N-substituted anthranilamides with isocyanides and arylboronicacids is achieved. This protocol offers an alternative approach toward 2,3-disubstituted quinazolinones with a wide substrate scope and good functional group tolerance.
Synthesis of 2-aryl quinazolinones <i>via</i> iron-catalyzed cross-dehydrogenative coupling (CDC) between N–H and C–H bonds
作者:Yoonkyung Jang、Seok Beom Lee、Junhwa Hong、Simin Chun、Jeeyeon Lee、Suckchang Hong
DOI:10.1039/d0ob00866d
日期:——
describe the direct synthesis of quinazolinones via cross-dehydrogenative coupling between methylarenes and anthranilamides. The C–H functionalization of the benzylic sp3 carbon is achieved by di-t-butyl peroxide under air, and the subsequent amination–aerobic oxidation process completes the annulation process. Iron catalyzed the whole reaction process and various kinds of functional groups were tolerated
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.
We demonstrate the direct use of benzylic alcohols for a multicomponent reaction of readily available isatoic anhydrides with amines in water, which is a synthetic route for the direct construction of a series of 2-aryl quinazolinones. This one-pot synthetic method involves the dehydrative N-benzylation of in situ generated anthranilamides followed by an amide-directed benzylic C−H amination process