52997-82-7Relevant articles and documents
The reaction of enaminones with carboxamidines: A convenient route for the synthesis of polyaza heterocycles
Bejan,Ait Haddou,Daran,Balavoine
, p. 1012 - 1018 (1996)
A simple and efficient synthetic method to polyaza heterocyclic structures containing 1,3-pyrimidine units has been developed. It is based on the reaction of the enaminones such as 5, 7 and 9 with the appropriate carboxamidines under basic conditions. By this procedure several new polyaza heterocycles have been prepared in good yields.
Mechanistic Studies on Ruthenium(II)-Catalyzed Base-Free Transfer Hydrogenation Triggered by Roll-Over Cyclometalation
Kerner, Christian,Lang, Johannes,Gaffga, Maximilian,Menges, Fabian S.,Sun, Yu,Niedner-Schatteburg, Gereon,Thiel, Werner R.
, p. 212 - 224 (2017/03/07)
The synthesis of 2-substituted pyridine–pyrimidine ligands and their complexation with arene ruthenium(II) chloride moieties is reported. Depending on the electronic and steric influences of the ligand, the catalysts undergo CH activation by roll-over cyclometalation. This process opens up the route to the catalytic transfer hydrogenation of ketones with isopropanol as the hydrogen source under base-free and mild conditions. Barriers related to the roll-over cyclometalation process can be determined experimentally by collision-induced dissociation ESI mass spectrometry. They are supported by DFT calculations and allow the classification of the ligands according to their electronic and steric properties, which is also in accordance with critical bond parameters derived from X-ray structure data. DFT calculations furthermore reveal that the formation of a ruthenium(II) hydrido species is plausible through β-hydride elimination from isopropanol.
Highly active and recyclable silica gel-supported palladium catalyst for mild cross-coupling reactions of unactivated heteroaryl chlorides
Lee, Dong-Hwan,Jung, Ji-Young,Jin, Myung-Jong
experimental part, p. 2024 - 2029 (2011/02/22)
Silica gel-supported β-ketoiminatophosphane-Pd complex (Pd@SiO 2) was shown to be a highly active and long-lived catalyst for aqueous Suzuki, Stille and Sonogashira coupling reactions of heteroaryl chlorides. A wide range of heteroaryl chlorides could be efficiently coupled with different nucleophilic partners in the presence of only 0.5 mol% catalyst and under mild conditions. This is one of the most powerful heterogeneous catalysts for the couplings of diverse heteroaryl chlorides. Furthermore, the catalyst could be reused with almost consistent activity. The Royal Society of Chemistry 2010.