Metal‐organic framework [Fe(BTC) (BTC=1,3,5‐benzenetricarboxylic acid)] is a convenient heterogeneous catalyst for the carbon‐carbon bond forming reaction in toluene between acetophenone and benzaldehyde to give selectively chalcone in high yield. Fe(BTC) appears as a general catalyst able to synthesize selectively different chalcone derivatives bearing various functionalities. Fe(BTC) could be recycled
A regioselective and convenient one-pot multicomponent synthesis of 9-amino-3,5-diaryl-4,9-dihydro-5<i>H</i>-[1,2,4]triazolo[5,1-<i>c</i>][1,2,4]triazepine-8-thiol
作者:Amr Hassan Moustafa、Amer Anwar Amer
DOI:10.1080/00397911.2017.1314494
日期:2017.6.3
environment-friendly procedure for the synthesis of a new series of nitrogen bridge-head [1,2,4]triazolo[5,1-c][1,2,4]triazepine derivatives through one-pot three-component reaction of polyfunctional triazole with aromatic aldehydes and acetophenone derivatives using alcoholic sodium hydroxide solution. The same new products were prepared in classical route through reaction of triazole with the corresponding chalcones
to 9 kbar) allows for relatively fast (1–5 h) and highlyenantioselective 1,4-addition of nitromethane and 2-nitropropane to chalcones at room temperature with substantial reduction of catalyst loading (0.2–1 mol% of cinchonaalkaloid-based thioureas and squaramides). Various γ-nitroketones were obtained at 9 kbar with high yield and enantioselectivity (up to 98%), whereas in control experiments at atmospheric
Diastereo- and enantioselective direct vinylogous Michael addition of γ-substituted butenolides to 2-enoylpyridines catalyzed by chiral bifunctional amine-squaramides
The diastereo- and enantioselectivedirectvinylogousMichaeladdition reaction of [gamma]-substituted butenolides to 2-enoylpyridines has been achieved. A range of [gamma],[gamma]-disubstituted butenolide derivatives, bearing two consecutive tri- and tetrasubstituted stereogenic...
Iron-oxide nanoparticles were obtained using chitosan templates and their crystalline character and particle size have been confirmed through powder x-ray diffraction and transmission electron microscopy measurements. The particle sizes were found to be 10–25 nm. The diversified chalcones 2 were reacted with 1-hydrazinylisoquinoline 1 in the presence of iron-oxide nanoparticles to the corresponding pyrazolines 3a–j in high yield and purity. The pyrazolines were characterized by spectroscopic techniques.