Synlett 2008(10): 1543-1546  
DOI: 10.1055/s-2008-1078427
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© Georg Thieme Verlag Stuttgart · New York

Optimization of Asymmetric Oxidation of Sulfides with the Fe(salan) Complex in Water and the Expanded Scope of its Application

Hiromichi Egami, Tsutomu Katsuki*
Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
Fax: +81(92)6422607; e-Mail: katsuscc@chem.kyushu-univ.jp;
Further Information

Publication History

Received 8 January 2008
Publication Date:
16 May 2008 (online)

Abstract

The scope of asymmetric oxidation of sulfides using Fe(salan) complex as a catalyst and aqueous hydrogen peroxide as an oxidant in water was broadened by optimizing the reaction conditions with respect to reaction temperature, catalyst loading, and amount of water solvent. The oxidation proceeded with high enantioselectivity under the optimized conditions. The undesired overoxidation of the resultant sulfoxides was significantly suppressed and the yields of sulfoxides were improved. Various functional groups were tolerant of the conditions.

15

In 1H NMR analysis (D2O), signals of methyl phenyl sulfide were broadened in the presence of 1 (sulfide/1 = 1:1).