Synlett 2018; 29(03): 340-343
DOI: 10.1055/s-0036-1591496
letter
© Georg Thieme Verlag Stuttgart · New York

Aluminum(III) Chloride Promoted Oxygen Transfer: Selective Oxidation of Sulfides to Sulfoxides

Yongtao Xie
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
,
Yuxin Li
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
,
Sha Zhou
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
,
Shaa Zhou
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
,
Yan Zhang
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
,
Minggui Chen
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
,
Zhengming Li*
State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Weijin Road 94th, Tianjin 300071, P. R. of China   Email: zml@nankal.edu.cn
› Author Affiliations
We acknowledge financial support from the Natural Science Foundation of China (NSFC, Grant Nos. 31370039 and 21602118) and from the Tianjin Natural Science Foundation (16JCYBJC29400).
Further Information

Publication History

Received: 10 August 2017

Accepted after revision: 26 September 2017

Publication Date:
24 November 2017 (online)


Abstract

An efficient selective oxidation of sulfides to sulfoxides has been developed by means of AlCl3-promoted oxygen transfer from phenyliodine diacetate [PhI(OAc)2]. AlCl3 proved to be the optimal ­Lewis acid for the activation of PhI(OAc)2. Various substituted sulfides were selectively transformed into the corresponding sulfoxides in good to excellent yields (≤99%). The high efficiency, excellent functional-group compatibility, broad substrate scope, and mild conditions render the current transformation useful for the synthesis of sulfoxides.

Supporting Information

 
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  • 15 The composition of the byproduct mixture was rather complicated. The main byproduct, (phenylsulfanyl)methyl acetate was isolated in 37% yield.
  • 16 Sulfoxides 2; General Procedure A 25 mL glass tube was charged with the appropriate sulfide 1 (1 mmol), MeOH (0.5 mL), and CH2Cl2 (4.5 mL). AlCl3 (0.5 mmol) was added, and the mixture was stirred at r.t. for 1 min. PhI(OAc)2 (1.0 equiv) was then added and the solution was stirred at r.t. until the sulfide was consumed (TLC). The solvent was removed under reduced pressure and the crude product was purified by column chromatography [silica gel (200–300 mesh), EtOAc–PE]. Methyl Phenyl Sulfoxide (2a) Colorless oil; yield: 138.6 mg (99%). 1H NMR (400 MHz, CDCl3): δ = 7.65 (dd, J = 7.8, 1.8 Hz, 2 H), 7.56–7.47 (m, 3 H), 2.72 (s, 3 H). 13C NMR (101 MHz, CDCl3): δ = 145.33, 130.99, 129.28, 123.41, 43.71. MS (ESI): m/z [M + H]+ calcd for C7H9OS: 141.0; found: 141.0. 4-Fluorophenyl Methyl Sulfoxide (2b) Colorless oil; yield: 132.7 mg (84%). 1H NMR (400 MHz, CDCl3): δ = 7.70–7.63 (m, 2 H), 7.28–7.21 (m, 2 H), 2.73 (s, 3 H). 13C NMR (101 MHz, CDCl3): δ = 165.47, 162.97, 140.94, 125.88, 125.80, 116.73, 116.50, 43.97. MS (ESI): m/z [M + H]+ calcd for C7H8FOS: 159.0; found: 158.8. 4-Chlorophenyl Methyl Sulfoxide (2c) Colorless oil; yield: 160.1 mg (92%). 1H NMR (400 MHz, CDCl3): δ = 7.59 (d, J = 8.4 Hz, 2 H), 7.51 (d, J = 8.6 Hz, 2 H), 2.72 (s, 3 H). 13C NMR (101 MHz, CDCl3): δ = 144.05, 137.06, 129.52, 124.92, 43.84. MS (ESI): m/z [M + H]+ calcd for C7H8ClOS: 175.0; found: 175.1. 4-Bromophenyl Methyl Sulfoxide (2d) White solid; yield: 189.7 mg (87%); mp 79–81°C. 1H NMR (400 MHz, CDCl3): δ = 7.65 (d, J = 8.5 Hz, 2 H), 7.51 (d, J = 8.5 Hz, 2 H), 2.70 (s, 3 H). 13C NMR (101 MHz, CDCl3): δ = 144.85, 132.58, 125.47, 125.19, 44.00. MS (ESI): m/z [M + H]+ calcd for C7H8BrOS: 218.9; found: 218.9.