Efficient Asymmetric Oxidation of Sulfides and Kinetic Resolution of Sulfoxides Catalyzed by a Vanadium−Salan System
作者:Jiangtao Sun、Chengjian Zhu、Zhenya Dai、Minghua Yang、Yi Pan、Hongwen Hu
DOI:10.1021/jo040221d
日期:2004.11.1
The asymmetricoxidation of sulfides to chiral sulfoxides with hydrogen peroxide in good yield and high enantioselectivity has been catalyzed very effectively by chiral vanadium−salan [N,N‘-alkyl bis(salicylamine)] complex. The salan ligand shows results superior in terms of reactivity and enantioselectivity to those of salen [N,N‘-alkylene bis(salicylideneimine)] analogue, and provides the sulfoxide
Asymmetricoxidation of sulfides was examined by using (salen)manganese(III) complexes as catalysts and (8S,8′S,1″S,2″S)-complex (3b) was found to show high asymmetric induction up to 90% ee. To be interested, however, (8R,8′R,1″S,2″S)-complex (1a) that showed excellent asymmetric induction in the epoxidation of simple olefins was a poor catalyst for the oxidation of sulfides.
Brunei, Jean-Michel; Kagan, Henri B., Bulletin de la Societe Chimique de France, 1996, vol. 133, # 11, p. 1109 - 1115
作者:Brunei, Jean-Michel、Kagan, Henri B.
DOI:——
日期:——
Synthesis of novel β-amino alcohols and their application in the catalytic asymmetric sulfoxidation of sulfides
作者:A. Ebru Aydin
DOI:10.1016/j.tetasy.2013.03.011
日期:2013.4
Novel chiral norephedrine-based beta-amino alcohol ligands containing a thiophene ring were prepared from norephedrine and substituted furan carbaldehydes (methyl- or ethyl-substituted) and used in combination with VO(acac)(2) for the asymmetric oxidation of aryl methyl sulfides using H2O2 as an oxidant. Amino alcohol derived Schiff bases 4,5a-b gave higher enantiomeric excesses than amino alcohol-derived reduced Schiff based ligands 6,7a-b. Of these chiral ligands, (1S,2R)-5b and (1S,2R)-7b gave high yields (90%) with moderate to high enantioselectivities (78%, 96% ee, respectively). The oxidation of other aryl methyl sulfides with (1S,2R)-5b and (1S,2R)-7b as ligands afforded the corresponding sulfoxides in 60-89% yields and with 92-99% ee. (C) 2013 Elsevier Ltd. All rights reserved.
Asymmetric Oxidation Catalysis by a Chiral Al(salalen) Complex: Highly Enantioselective Oxidation of Sulfides with Aqueous Hydrogen Peroxide