Synlett 2011(9): 1308-1312  
DOI: 10.1055/s-0030-1260544
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Stereoselective Synthesis of (E)-Alkenyl Sulfones from Alkenes or Alkynes via Copper-Catalyzed Oxidation of Sodium Sulfinates

Nobukazu Taniguchi*
Department of Chemistry, Fukushima Medical University, Fukushima 960-1295, Japan
Fax: +81(24)5471369; e-Mail: taniguti@fmu.ac.jp;
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Publikationsverlauf

Received 27 January 2011
Publikationsdatum:
20. April 2011 (online)

Abstract

Alkenyl sulfones can be stereoselectively synthesized from alkenes or alkynes using sodium sulfinates. The reaction can be performed by a copper-catalyzed oxidation of sodium sulfinates in air. The reaction of alkenes gives (E)-alkenyl sulfones via anti addition of sulfonyl cation and elimination process. Furthermore, the employment of alkynes produces (E)-β-haloalkenyl sulfones in the presence of potassium halides.

    References and Notes

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11

Typical Procedure of Alkenyl Sulfones Using Alkenes
To a mixture of CuI (4.6 mg, 0.024 mmol), bpy (3.7 mg, 0.024 mmol), PhSO2Na (2a, 59.4 mg, 0.33 mmol), and KI (24.9 mg, 0.15 mmol) in DMSO (0.15 mL) and AcOH (0.15 mL) was added styrene 1a (31.2 mg, 0.3 mmol), and the mixture was stirred at 100 ˚C for 18 h in air. After the residue was dissolved in Et2O, the solution was washed with sat. NaHCO3, H2O, and sat. NaCl and dried over anhyd MgSO4. Chromatography on silica gel (30% Et2O-hexane) gave phenyl (E)-2-phenylethenyl sulfone (3aa, 68.7 mg, 94%). ¹H NMR (270 MHz, CDCl3): δ = 7.96-7.93 (m, 2 H), 7.68 (d, J = 15.5 Hz, 1 H), 7.58-7.30 (m, 8 H), 6.87 (d, J = 15.5 Hz, 1 H). ¹³C NMR (67.5 MHz, CDCl3): δ = 142.4, 140.6, 133.3, 132.2, 131.1, 129.3, 128.9, 128.5, 127.6, 127.2. IR (CHCl3): 3061, 3025, 1613, 1447, 1306 cm. Anal. Calcd for C14H12O2S: C, 68.83; H, 4.95. Found: C, 68.75; H, 5.13.

13

Typical Procedure of β-Haloalkenyl Sulfones Using Alkynes
To a mixture of CuI (4.6 mg, 0.024 mmol), bpy (3.7 mg, 0.024 mmol), PhSO2Na (2a, 59.4 mg, 0.33 mmol), and KBr (39.3 mg, 0.33 mmol) in AcOH (0.3 mL) was added phenylacetylene 1a (30.6 mg, 0.3 mmol), and the mixture was stirred at 100 ˚C for 18 h in air. After the residue was dissolved in Et2O, the solution was washed with sat. NaHCO3, H2O, and sat. NaCl and dried over anhyd MgSO4. Chromatography on silica gel (40% Et2O-hexane) gave (E)-1-phenylsulfonyl-2-bromo-2-phenylethene (7aa, 60.7 mg, 63%). ¹H NMR (270 MHz, CDCl3): δ = 7.61-7.51 (m, 3 H), 7.42-7.30 (m, 7 H), 7.17 (s, 1 H). ¹³C NMR (67.5 MHz, CDCl3): δ = 140.2, 138.7, 135.9, 134.1, 133.5, 130.4, 128.9, 128.5, 127.9, 127.7. IR (CHCl3): 3056, 1611, 1590, 1446, 1324 cm. Anal. Calcd for C14H11O2SBr: C, 52.03; H, 3.43. Found: C, 51.42; H, 3.17.

14

In the presence of the proton, the disproportionation of copper ion easily proceeds, see ref. 12.