124932-30-5Relevant academic research and scientific papers
Asymmetrische Katalysen. XLVI. Enantioselektive Hydrosilylierung von Ketonen mit 2 und optisch aktiven Stickstoff-Liganden
Botteghi, Carlo,Schionato, Alberto,Chelucci, Giorgio,Brunner, Henri,Kuerzinger, Alfred,Obermann, Uwe
, p. 17 - 32 (1989)
The synthesis and characterisation of 16 optically active nitrogen ligands, namely, pyridinethiazolidones, pyridinethiazolines, pyridinimidazolines, Schiff bases and bipyridines, are described.These ligands are used as cocatalysts together with the procat
Iridium-catalyzed highly chemoselective and efficient reduction of nitroalkenes to nitroalkanes in water
Chen, Yang,Liu, Changmeng,Xu, Dong,Xu, Jiaxi,Yang, Zhanhui
supporting information, p. 6050 - 6058 (2021/08/23)
An iridium-catalyzed highly chemoselective and efficient transfer hydrogenation reduction of structurally diverse nitroalkenes was realized at very low catalyst loading (S/C = up to 10000 or 20?000), using formic acid or sodium formate as a traceless hydride donor in water. Excellent functionality tolerance is also observed. The turnover number and turnover frequency of the catalyst reach as high as 18?600 and 19?200 h-1, respectively. An inert atmosphere protection is not required. The reactivities of nitroalkenes are dependent on their substitution pattern, and the pH value is a key factor to accomplish the complete conversion and excellent chemoselectivity. Purification of products is achieved by simple extraction without column chromatography. The reduction procedure is facilely amplified to 10 g scale at 10?000 S/C ratio. The potential of this green reduction in enantioselective hydrogenation has been demonstrated.
One-pot synthesis of imidazolines from aldehydes: detailed study about solvents and substrates
Fujioka, Hiromichi,Murai, Kenichi,Kubo, Ozora,Ohba, Yusuke,Kita, Yasuyuki
, p. 638 - 643 (2007/10/03)
Imidazolines were prepared in one-pot operation from aldehydes and diamines through oxidation of aminal intermediates by NBS. This method could be applied to various aromatic and aliphatic aldehydes and N-nonsubstituted and N-monosubstituted 1,2-diamines. Furthermore, it was found that CH2Cl2 could be altered to TBME, a more environmentally friendly solvent, in the reaction using N-nonsubstituted 1,2-diamines. The reaction conditions were very mild and chemoselective.
Chiral pyridylimidazolines: synthesis, arene ruthenium complexes and application in asymmetric catalysis
Davenport, Adam J.,Davies, David L.,Fawcett, John,Russell, David R.
, p. 1500 - 1503 (2007/10/03)
Condensation of (1S,2S)-1,2-diphenylethylenediamine and 2-cyanopyridine gives the chiral pyridylimidazoline (L1), deprotonation followed by treatment with methyl iodide gives an NMe derivative (L2). The pyridylimidazolines react with [RuCl2(mes)]2 (mes = 1,3,5-trimethylbenzene) in the presence of NaSbF6 to give [RuCl(L)(mes)][SbF6] (1, 2) which have been characterised by X-ray crystallography. After treatment with AgSbF6 both complexes are enantioselective catalysts for the Diels-Alder reaction of methacrolein and cyclopentadiene.
