Catalysts for enantioselective Biginelli reaction based on the composite silica-zirconia xerogels prepared using different zirconium sources
authors Krivtsov, IV; Titova, YA; Ilkaeva, MV; Avdin, VV; Fedorova, OV; Khainakov, SA; Garcia, JR; Rusinov, GL; Charushin, VN
nationality International
journal JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
author keywords Silica-zirconia; Biginelli reaction; Enantioselective catalyst; Sol-gel method
keywords ONE-POT SYNTHESIS; OXIDES; ACID
abstract The composite silica-zirconia xerogels have been prepared via sol-gel method using zirconium oxychloride, oxynitrate, acetate and sodium silicate as the precursors. The prepared materials have been characterized using FTIR, TG/DTA, EDX and surface area analyses. It has been established that surface area of silica-zirconia xerogels significantly depends on the zirconium source, but phase transitions and structural features of the xerogels seem to be unaffected by the choice of the zirconia precursor. Prepared xerogels increase the activity of chiral inductor in the asymmetric Biginelli reaction. The anion of the zirconium salt adsorbed on the surface of the synthesized material and the presence of Si-O-Zr heterolinkages determines the reaction yield. The highest chemo- and enantioselectivity towards formation of ee isomer have been provided by the catalyst prepared from zirconium oxychloride.
publisher SPRINGER
issn 0928-0707
year published 2014
volume 69
issue 2
beginning page 448
ending page 452
digital object identifier (doi) 10.1007/s10971-013-3242-z
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000330975000027
link https://link.springer.com/article/10.1007%2Fs10971-013-3242-z
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