Resumo

ZHANG, Tengfei; ZHANG, Wei; DONG, Hao  e  LIU, Qing. H₃PW₁₂O₄₀ Anchored on the Three-Dimensional and Networked SBA-15 as an Efficient and Recyclable Catalyst for Mannich Reaction. J. Mex. Chem. Soc [online]. 2020, vol.64, n.1, pp.1-13.  Epub 31-Dez-2020. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v64i1.1034.

The three-dimensional and networked SBA-15 (3D-SBA-15) supported phosphotungstic acid (PW) was used as heterogeneous catalyst for the one-pot three-components Mannich reaction at room temperature. The H3PW12O40/3D-SBA-15 catalyst was prepared using an impregnation method and confirmed by series of characterizations such as Fourier-transform infrared spectra (FT-IR), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), N2 physisorption and thermogravimetric (TG) analysis. 50PW/3D-SBA-15 catalyst with H3PW12O40 loading of 50 wt% showed the highest yield of 93% in 1.8 h for the Mannich reaction of benzaldehyde, aniline and acetophenone under solvent-free condition. A series of β-aminoketone derivatives were synthesized successfully in the presence of this catalyst. In addition, H3PW12O40/3D-SBA-15 catalyst can be easily recovered and reused four times without significant decrease of the activity. This work provides an improved modification of the three-component Mannich reaction in terms of mild reaction conditions, clean reaction profiles, small quantity of catalyst and a simple workup procedure.

Palavras-chave : H₃PW₁₂O₄₀; 3D-SBA-15; heterogeneous catalysis; Mannich reaction.