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.
Direct Construction of Diverse Polyheterocycles Bearing Pyrrolidinediones via Rh(III)‐Catalyzed Cascade C−H Activation/Spirocyclization
作者:Shreedhar Devkota、Ha‐Jin Lee、Sung Hong Kim、Yong Rok Lee
DOI:10.1002/adsc.201901019
日期:2019.12.17
Rh(III)‐catalyzed cascade oxidative annulation of 2‐arylquinazolinones with various maleimides to afford spiroisoindoloquinazolinones bearing pyrrolidinediones is described. Sequential ortho C−H functionalization and spirocyclization via aza‐Michael addition result in the formation of both C−C and C−N bonds in a single operation. This atom‐ and step‐economic strategy provides an efficient and novel
by nature, organic chemists have been using a divergent strategy to improve the synthetic efficiency of diverse molecules. Transition-metal-catalyzed C–H functionalization has become one of the most straightforward, powerful, and atom-economical methods to construct complex scaffolds. However, C–H activation initiated divergent transformation to prepare diverse molecules is still limited. To address
A transition-metal-catalyzed C−H activation cascade strategy to rapidly construct diverse quinazolinone derivatives in a one-pot manner is reported. The catalysts play an important role in the different transformations. Additionally, the procedure is scalable, proceeds with high efficiency and good chemo-/regio-selectivity, and tolerates a range of functional groups.
Green light-mediated dual eosin Y/PdII-catalyzed C(sp2)–H arylation of N–H unprotected 2-arylquinazolinones
作者:Shuvam Mondal、Ranjan Jana
DOI:10.1039/d4ob00779d
日期:——
An eosin Y/PdII dual catalytic highly regio- and chemoselective C(sp2)–H monoarylation of N–H unprotected 2-phenyl quinazolinones with diazonium salts under visible light irradiation is disclosed.