427900-17-2Relevant articles and documents
Rational Optimization of Lewis-Acid Catalysts for Direct Alcohol Amination, Part 2 – Titanium Triflimide as New Active Catalyst
Payard, Pierre-Adrien,Finidori, Céline,Guichard, Laurélia,Cartigny, Damien,Corbet, Matthieu,Khrouz, Lhoussain,Bonneviot, Laurent,Wischert, Raphael,Grimaud, Laurence,Pera-Titus, Marc
supporting information, p. 3225 - 3228 (2020/06/08)
The reactivity of a new titanium triflimide salt (see Part 1) was investigated for the direct amination of alcohols. The combination of this new Lewis acid with pyridine-based ligands allowed a significant increase of activity. The scope of the reaction was increased compared to other Lewis-acid-based protocols. Finally, mechanistic insights based on EPR spectroscopy and DFT calculations are provided.
Synthesis, structure, and fullerene-complexing property of azacalix[6]aromatics
Fa, Shi-Xin,Wang, Li-Xia,Wang, De-Xian,Zhao, Liang,Wang, Mei-Xiang
, p. 3559 - 3571 (2014/05/06)
Synthesis, structure, and fullerene-binding property of azacalix[6]aromatics were systematically studied. By means of [3 + 3] and [2 + 2 + 2] fragment coupling protocols, a number of azacalix[6]aromatics containing different combinations of benzene, pyridine, and pyrimidine rings and various substituents on the bridging nitrogen atoms were synthesized conveniently in moderate to good yields. The resulting macrocycles adopt in the solid state symmetric and heavily distorted 1,3,5-alternate conformations depending on the aromatic building units, whereas, in solution, they exist as a mixture of conformers that undergo rapid interchanges relative to the NMR time scale. All macrocycles were able to form 1:1 complexes with C60 and C 70 in toluene with the association constants up to 7.28 × 104 M-1. In the crystalline state, azacalix[6]aromatics form complexes with C60 and C70 with 2:1, 1:1, and 1:2 stoichiometric ratios between host and guest. Azacalix[6]aromatics interact with fullerene by forming mainly the sandwich structure in which C60 or C70 is sandwiched by two macrocycles. X-ray molecular structures revealed that multiple π-π and CH-π interactions between concave azacalix[6]aromatics and convex fullerenes C60 and C70 contribute a joint driving force to the formation of host-guest complexes.
Palladium-catalysed amination of halopyridines on a KF-alumina surface
Basu, Basudeb,Jha, Satadru,Mridha, Niranjan K.,Bhuiyan, Md. Mosharef H.
, p. 7967 - 7969 (2007/10/03)
Palladium-catalysed C-N hetero cross-coupling reactions between bromopyridines and amines (both primary and secondary) can be efficiently performed on a KF-alumina (basic) surface, thus negating the use of strong bases such as sodium tert-butoxide. The reaction conditions are optimised with reference to catalytic systems, solvents and the surface.