18103-80-5Relevant articles and documents
Site-selective c-h acylation of pyridinium derivatives by photoredox catalysis
Jung, Sungwoo,Lee, Hyeonyeong,Moon, Yonghoon,Jung, Hoi-Yun,Hong, Sungwoo
, p. 9891 - 9896 (2019)
A strategy for visible-light-induced site-selective C-H acylation of pyridinium salts was developed by employing N-methoxy-or N-aminopyridinium salts, offering a powerful synthetic tool for accessing highly valuable C2- A nd C4-acylated pyridines. The met
Visible-light-initiated catalyst-free oxidative cleavage of (Z)-triaryl-substituted alkenes containing pyridyl motif under ambient conditions
Chen, Hua,Fu, Haiyan,Ge, Yicen,Li, Ruixiang,Li, Shun,Li, Wenjing,Luo, Lihua,Xu, Jiaqi,Yuan, Maolin,Zheng, Xueli
, p. 3649 - 3655 (2021/06/06)
The catalyst-free oxidative cleavage of (Z)-triaryl-substituted alkenes bearing a pyridyl motif in ambient air under the irradiation of blue LEDs at room temperature has been developed. The reaction was facile and scalable, and proceeded with good functional group tolerance, affording pharmaceutically useful 2-acyl pyridines. The electron paramagnetic resonance (EPR) studies together with control experiments showed that the singlet oxygen (1O2) and superoxide anion (O2˙?) are the reactive oxidants. The1O2generation mechanism correlated well with the photophysical properties of the substrate (Z)-triaryl-substituted alkenes, the excited state of which was proved to serve as the triplet sensitizer for the generation of1O2
Palladium-N-heterocyclic carbene an efficient catalytic system for the carbonylative cross-coupling of pyridine halides with boronic acids
Maerten, Eddy,Sauthier, Mathieu,Mortreux, André,Castanet, Yves
, p. 682 - 689 (2007/10/03)
Carbonylative cross-coupling of different pyridyl halides with various boronic acids was studied using catalytic systems constituted of N-heterocyclic carbene type ligands and palladium. These systems easily obtained in situ from the corresponding imidazolium salt and palladium acetate appear more efficient toward bromopyridines than catalysts based on hindered and basic alkylphosphines such as tricyclohexylphosphine. Their higher efficiency was also evidenced by coupling using chloro- or dichloropyridines and chloroquinolines, which practically do not react with catalytic systems based on phosphines.