Metal-free C(sp 3 )–H oxidation of 2-methylquinolines with PIDA under microwave irradiation
摘要:
An efficient metal-free protocol has been developed for the sp(3) C-H bond oxidation of 2-methylquinolines in the presence of PIDA under microwave irradiation, providing 2-quinolinecarboxaldehydes with moderate to high yields and excellent selectivities. A wide range of 2-quinolinecarboxaldehydes with different functional groups have been synthesized. A tentative mechanism has been presented to explain this highly selective oxidation process. (C) 2016 Elsevier Ltd. All rights reserved.
Continuous Flow Synthesis of Ketones from Carbon Dioxide and Organolithium or Grignard Reagents
作者:Jie Wu、Xiaoqing Yang、Zhi He、Xianwen Mao、T. Alan Hatton、Timothy F. Jamison
DOI:10.1002/anie.201405014
日期:2014.8.4
describe an efficient continuousflowsynthesis of ketones from CO2 and organolithium or Grignard reagents that exhibits significant advantages over conventional batch conditions in suppressing undesired symmetric ketone and tertiary alcohol byproducts. We observed an unprecedented solvent‐dependence of the organolithium reactivity, the key factor in governing selectivity during the flow process. A facile
Radical C−H Acylation of Nitrogen Heterocycles Induced by an Aerobic Oxidation of Aldehydes
作者:Subhasis Paul、Manotosh Bhakat、Joyram Guin
DOI:10.1002/asia.201900857
日期:2019.9.16
ketones is described herein. The reaction involves cross-dehydrogenative coupling between aldehydes and heteroaromatic bases with molecularoxygen (O2 ). The key aspect of the method is the generation of reactive acyl radical via homolytic activation of aldehyde C-H bond using O2 as the sole oxidant. The reaction has a good substrate scope with respect to aldehydes and functionalized nitrogen heterocycles
An efficient one-step synthesis of 2-acylquinolines using a copper-catalyzed tandem reaction of 2-ethynylanilines with glyoxals in the presence of piperidine has been developed. This new protocol successfully avoids multi-step operation and the use of highly toxic cyanides required in traditional methods, and provides a practical tool for synthetic and pharmaceutical chemists. Various 2-acylquinolines