An easy and effective approach towards heterogeneous Pt/SiO₂-cinchonidine catalyst system for enantioselective hydrogenation of ethyl pyruvate
2011
Azmat, Muhammad Usman | Guo, Yong | Guo, Yun | Wang, Yanqin | Lu, Guanzhong
A single unit catalyst system (Pt/silica–chiral modifier) is developed for the enantioselective hydrogenation of ethyl pyruvate. Cinchonidine was tethered directly without prior modification over carboxylate functionalized SBA-15 by the reaction of vinyl group in cinchonidine with –COOH group in functionalized SBA-15 through ester linkage. Then Pt nanoparticles were deposited over cinchonidine tethered SBA-15. The mesostructures were characterized by small-angle XRD, N₂ sorption and TEM, while the surface functionalization was confirmed by FTIR, TG/DTA and solid state ¹³C NMR. Enantioselectivity of the catalyst system for hydrogenation of ethyl pyruvate was determined by GC/FID. The highest enantiomeric excess was achieved as 70.8% and the catalyst recyclability was authenticated even after 3rd reuse without significant loss in enantiomeric excess.
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