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Synlett 2008(6): 849-852  
DOI: 10.1055/s-2008-1042903
LETTER
© Georg Thieme Verlag Stuttgart · New York

Copper-Catalyzed Addition of Halide and Sulfide Groups to Alkynes Utilizing Disulfides with Tetrabutylammonium Halides

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

Received 28 November 2007
Publikationsdatum:
11. März 2008 (online)

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Abstract

A copper-catalyzed addition of halide and sulfide groups to internal alkynes was carried out using disulfides with n-Bu4NX (X = Br, I or Cl) in air. The present reaction can selectively prepare the corresponding anti-configured haloalkenyl sulfide, and uses both sulfide groups of the disulfide reagent.

Key words

alkenyl sulfides - alkenyl halides - copper catalyst - di­sulfides - internal alkynes

7

Typical Procedure: To a mixture of CuI (1.9 mg, 0.01 mmol), bpy (1.6 mg, 0.01 mmol), diphenyl disulfide (21.8 mg, 0.1 mmol), and TBAB (70.9 mg, 0.22 mmol) in AcOH (0.3 mL) was added 4-octyne (22.0 mg, 0.2 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 H2O and sat. NaCl and dried over anhyd MgSO4. Chromatography on silica gel(hexane) gave (E)-4-bromo-5-phenylthiooctene (48.7 mg, 81%).
( E )- n -Pr(PhS)C=C(Br) n -Pr: IR (neat): 2960, 2870, 1582, 1476, 1461 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.16-7.31 (m, 5 H), 2.90 (t, J = 7.5 Hz, 2 H), 2.38 (t, J = 7.5 Hz, 2 H), 1.51-1.67 (m, 4 H), 0.92 (t, J = 7.5 Hz, 3 H), 0.86 (t, J = 7.5 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 135.3, 132.8, 131.5, 129.2, 128.9, 126.2, 41.2, 38.8, 21.9, 21.0, 13.6, 13.1. Anal. Calcd for C14H19SBr: C, 56.19; H, 6.40. Found: C, 56.09; H, 6.27.
( E )- n -Pr(PhS)C=C(I) n -Pr: IR (neat): 2959, 1582, 1476, 1461 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.16-7.31 (m, 5 H), 2.94 (t, J = 7.3 Hz, 2 H), 2.39 (t, J = 7.3 Hz, 2 H), 1.50-1.66 (m, 4 H), 0.92 (t, J = 7.3 Hz, 3 H), 0.87 (t, J = 7.3 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 135.5, 135.4, 129.3, 128.9, 126.4, 113.0, 45.4, 43.9, 22.9, 21.3, 13.5, 12.9. Anal. Calcd for C14H19SI: C, 48.56; H, 5.53. Found: C, 48.48; H, 5.47.

9

( Z )- n -Pr(H)C=C(SPh) n -Pr: IR (neat): 2958, 1583, 1476 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.11-7.29 (m, 5 H), 5.90 (t, J = 7.1 Hz, 1 H), 2.31 (q, J = 7.2 Hz, 2 H), 2.14 (t, J = 7.2 Hz, 2 H), 1.36-1.56 (m, 4 H), 0.92 (t, J = 7.2 Hz, 3 H), 0.82 (t, J = 7.2 Hz, 3 H). The NOE was observed at two allyl positions {(CH2CH=, 15%) and [=C(SPh)CH2, 11%]} on irradiation at δ = 5.90 ppm (=CH). 13C NMR (67.5 MHz, CDCl3): δ = 136.7, 135.8, 133.0, 129.2, 128.7, 125.6, 39.6, 31.9, 22.7, 21.6, 13.8, 13.3. Anal. Calcd for C14H20SBr: C, 76.30; H, 9.15. Found: C, 76.03; H, 8.92.

10

In the absence of bpy, the yield of 3 was 39% yield.

11

( E )- n -Pr(4-MeC 6 H 4 S)C=C(Br) n -Pr: IR (neat): 2960, 2929, 1894, 1602, 1491 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.15 (d, J = 8.3 Hz, 2 H), 7.09 (d, J = 8.3 Hz, 2 H), 2.90 (t, J = 7.4 Hz, 2 H), 2.34 (t, J = 7.4 Hz, 2 H), 2.32 (s, 3 H), 1.49-1.67 (m, 4 H), 0.93 (t, J = 7.4 Hz, 3 H), 0.86 (t, J = 7.4 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 136.5, 132.2, 131.5, 131.4, 130.1, 129.8, 41.2, 38.5, 21.9, 21.0, 13.6, 13.1. Anal. Calcd for C15H21SBr: C, 57.50; H, 6.76. Found: C, 57.21; H, 6.67.
( E )- n -Pr(4-MeOC 6 H 4 S)C=C(Br) n -Pr: IR (neat): 2960, 2930, 1592, 1493 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.24 (d, J = 8.9 Hz, 2 H), 6.84 (d, J = 8.9 Hz, 2 H), 3.79 (s, 3 H), 2.91 (t, J = 7.3 Hz, 2 H), 2.28 (t, J = 7.5 Hz, 2 H), 1.48-1.68 (m, 4 H), 0.94 (t, J = 7.4 Hz, 3 H), 0.85 (t, J = 7.4 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 159.2, 133.3, 132.8, 129.5, 125.1, 114.6, 55.3, 41.1, 38.0, 21.9, 20.9, 13.6, 13.1. Anal. Calcd for C15H21OSBr: C, 54.71; H, 6.43. Found: C, 54.53; H, 6.38.
( E )- n -Pr(4-BrC 6 H 4 S)C=C(Br) n -Pr: IR (neat): 2960, 2929, 1889, 1603, 1471 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.40 (d, J = 8.6 Hz, 2 H), 7.08 (d, J = 8.6 Hz, 2 H), 2.87 (t,
J = 7.2 Hz, 2 H), 2.37 (t, J = 7.7 Hz, 2 H), 1.49-1.67 (m, 4 H), 0.92 (t, J = 7.4 Hz, 3 H), 0.87 (t, J = 7.4 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 134.7, 133.7, 132.0, 130.9, 130.2, 120.1, 41.3, 38.8, 21.9, 21.0, 13.6, 13.0. Anal. Calcd for C14H18SBr2: C, 44.46; H, 4.80. Found: C, 44.32; H, 4.89.
( E )- n -Pr(MeS)C=C(Br) n -Pr: IR (neat): 2960, 2928, 1602, 1459 cm-1. 1H NMR (270 MHz, CDCl3): δ = 2.81 (t, J = 7.2 Hz, 2 H), 2.48 (t, J = 7.7 Hz, 2 H), 2.20 (s, 3 H), 1.54-1.63 (m, 4 H), 0.95 (t, J = 5.3 Hz, 3 H), 0.91 (t, J = 5.3 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 133.4, 127.4, 40.8, 37.4, 21.7, 21.0, 16.4, 13.6, 12.9. Anal. Calcd for C9H17SBr: C, 45.57; H, 7.22. Found: C, 45.60; H, 6.93.
( E )- n -Pr( n -BuS)C=C(Br) n -Pr: IR (neat): 2960, 2929, 1601, 1462 cm-1. 1H NMR (270 MHz, CDCl3): δ = 2.84 (t,
J = 7.4 Hz, 2 H), 2.61 (t, J = 7.1 Hz, 2 H), 2.45 (t, J = 7.6 Hz, 2 H), 1.51-1.65 (m, 6 H), 1.36-1.48 (m, 2 H), 0.88-0.94 (m, 9 H). 13C NMR (67.5 MHz, CDCl3): δ = 132.4, 128.9, 40.9, 37.8, 32.5, 31.9, 21.9, 21.8, 21.1, 13.6, 13.0. Anal. Calcd for C12H23SBr: C, 51.61; H, 8.30. Found: C, 51.36; H, 8.17.
( E )- n -Pr(BnS)C=C(Br) n -Pr: IR (neat): 2960, 2929, 1601, 1494, 1453 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.19-7.31 (m, 5 H), 3.80 (s, 2 H), 2.65 (t, J = 7.2 Hz, 2 H), 2.48 (t, J = 7.5 Hz, 2 H), 1.53-1.67 (m, 2 H), 1.36-1.49 (m, 2 H), 0.94 (t, J = 7.4 Hz, 3 H), 0.81 (t, J = 7.4 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 137.8, 131.8, 131.5, 128.8, 128.5, 127.0, 40.7, 38.5, 37.9, 21.7, 21.0, 13.6, 12.9. Anal. Calcd for C15H21SBr: C, 57.50; H, 6.76. Found: C, 57.15; H, 6.85.
( E )- n -Pr(PhSe)C=C(Br) n -Pr: IR (neat): 2959, 2929, 1608, 1577, 1475 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.36-7.42 (m, 2 H), 7.23-7.28 (m, 3 H), 2.89 (t, J = 7.4 Hz, 2 H), 2.41 (t, J = 7.4 Hz, 2 H), 1.46-1.69 (m, 4 H), 0.92 (t, J = 7.2 Hz, 3 H), 0.86 (t, J = 7.2 Hz, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 132.1, 130.6, 129.5, 129.3, 129.2, 127.1, 43.3, 40.7, 21.9, 21.3, 13.5, 13.0. Anal. Calcd for C14H19SeBr: C, 48.58; H, 5.53. Found: C, 48.82; H, 5.54.
( E )-Ph(Br)C=C(SPh)Me: IR (neat): 3057, 1581, 1475, 1439 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.24-7.41 (m, 10 H), 2.21 (s, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 140.5, 134.5, 130.5, 130.2, 129.1, 129.0, 128.5, 128.1, 126.9, 123.3, 24.9. Anal. Calcd for C15H13SBr: C, 59.02; H, 4.29. Found: C, 58.94; H, 4.37.
( E )-Ph(Br)C=C(SPh)CH 2 OAc: IR (neat): 3058, 1743, 1581, 1477, 1440 cm-1. 1H NMR (270 MHz, CDCl3): δ = 7.20-7.41 (m, 10 H), 4.96 (s, 2 H), 2.00 (s, 3 H). 13C NMR (67.5 MHz, CDCl3): δ = 170.4, 139.7, 133.9, 130.3, 129.4, 129.3, 129.0, 128.8, 128.1, 127.2, 66.2, 20.6. Anal. Calcd for C17H15O2SBr: C, 56.21; H, 4.16. Found: C, 56.32; H, 4.25.

12

The stereochemistry of compounds in entries 12 and 14 was determined by NOE after the debromination.

15

When PhSCu was treated with acetic acid, (PhS)2 was obtained in 80% yield.