期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 264, 期 1-2, 页码 280-287出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2006.09.038
关键词
asymmetric catalysis; H2O2; sulfoxides; chiral Schiff bases; titanium complexes
Sulfoxidation catalysts generated in situ from titanium(IV) isopropoxide and enantiopure Schiff bases promote the enantioselective oxidation of alkyl aryl sulfides to the corresponding sulfoxides at low catalyst loadings (< 1 mol%), 30% aqueous hydrogen peroxide being the terminal oxidant. Upon screening of several ligands derived from beta-aminoalcohols and salicylaldehydes, a catalyst affording sulfoxides with over 90% chemoselectivity and up to 60% ee was found, and the kinetics of the catalytic reaction was analyzed by H-1 NMR. (c) 2006 Elsevier B.V. All rights reserved.
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