期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 353, 期 8, 页码 1234-1240出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201100062
关键词
click chemistry; direct immobilization; enantioselective aerobic oxidation; recyclable catalysts; vanadyl compounds
资金
- National Science Council of Taiwan
The direct immobilization of two different C-5-propargyl ether-modified, chiral N-salicylidene vanadyl(V) tert-leucinates onto 4-azidomethyl-substituted polystyrene by click chemistry was examined. Among the eight different solvents investigated, the resulting polystyrene-supported catalysts promote the asymmetric, aerobic oxidation of a-hydroxy (thio) esters and amides with enantioselectivities of up to 99% ee (selectivity factor up to 41) in chloroform. These polystyrene-supported catalysts can be readily recovered by filtration and reused for at least four consecutive runs without discernible loss of reactivity and enantioselectivity.
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