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Synlett 2016; 27(02): 259-261
DOI: 10.1055/s-0035-1560486
DOI: 10.1055/s-0035-1560486
letter
Copper-Catalyzed Domino Addition–Cyclization Reaction between Terminal Alkynes, Carbon Disulfide, and Oxiranes
Further Information
Publication History
Received: 06 July 2015
Accepted after revision: 03 September 2015
Publication Date:
13 October 2015 (online)
Abstract
Copper or silver salts promote a domino addition–cyclization reaction between terminal alkynes, carbon disulfide, and oxiranes in a regioselective manner to afford 1,4-oxathiane derivatives in good yield.
Supporting Information
- Supporting information for this article is available online at http://dx.doi.org/10.1055/s-0035-1560486.
- Supporting Information
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References and Notes
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- 18 Typical Procedure for Preparation of 4 and 6 To a mixture of terminal alkyne (1.5–2.0 mmol), Cu(OAc)2 (0.1–0.2 mmol), sodium ascorbate (0.2–0.3 mmol), and (i-Pr)2NEt (1.5–2.0 mmol) in H2O–t-BuOH (2:1, 3 mL) at 0 °C were added CS2 (3 mmol) and the oxirane or aziridine (1.0 mmol). After 30 min the resulting brownish mixture was warmed to ambient temperature and stirred for 8–14 h. After completion of the reaction, the mixture was diluted with EtOAc (5 mL) and sat. NH4Cl solution (5 mL) was added. The mixture was stirred for an additional 30 min and the organic layer separated. The aqueous layer was extracted with EtOAc (3 × 4 mL), and the combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by chromatography (silica gel; hexane–EtOAc, 3:1) to give the pure product.
- 19 N-Ts Aziridine 5 was prepared using the literature procedures.17 Representative Analytical Data 2-Benzylidene-6-methyl-1,4-oxathiane-3-thione (4a) Pale yellow oil; yield 0.19 g (79%). IR (KBr): νmax = 3025, 2967, 1610, 1543, 1326, 1121 cm–1. 1H NMR (500.1 MHz, CDCl3): δ = 1.29 (3 H, d, 3 J = 7.0 Hz, Me), 3.30 (1 H, dd, 2 J = 11.7 Hz, 3 J = 9.1 Hz, CH), 3.41 (1 H, dd, 2 J = 11.7 Hz, 3 J = 5.6 Hz, CH), 4.58–4.64 (1 H, m, CH), 5.49 (1 H, s, CH), 7.18 (1 H, t, 3 J = 6.9 Hz), 7.26 (2 H, d, 3 J = 6.8 Hz), 7.31 (2 H, d, 3 J = 6.6 Hz). 13C NMR (125.7 MHz, CDCl3): δ = 19.1 (Me), 42.8 (CH2), 79.1 (CH), 102.2 (CH), 125.4 (2 CH), 129.2 (CH), 131.0 (2 CH), 136.3 (C), 156.7 (C), 213.9 (C). MS: m/z (%) = 236 (2) [M+], 160 (38), 119 (56), 105 (74), 77 (100), 58 (42). Anal. Calcd for C12H12OS2 (236.35): C, 60.98; H, 5.12; S, 27.13. Found: C, 61. 15; H, 5.27; S, 27.19. 2-Benzylidene-6-ethyl-1,4-oxathiane-3-thione (4b) Pale yellow oil; yield 0.18 g (73%). IR (KBr): νmax = 3021, 3010, 2945, 1634, 1536, 1325, 1130 cm–1. 1H NMR (500.1 MHz, CDCl3): δ = 0.91 (3 H, t, 3 J = 6.2 Hz, Me), 1.56–1.60 (2 H, m, CH2), 3.25–3.37 (2 H, m, CH2), 4.61–4.66 (1 H, m, CH), 5.23 (1 H, s, CH), 7.14 (1 H, t, 3 J = 6.7 Hz), 7.24 (2 H, d, 3 J = 6.4 Hz), 7.31 (2 H, d, 3 J = 6.4 Hz). 13C NMR (125.7 MHz, CDCl3): δ = 14.3 (Me), 24.7 (CH2), 45.2 (CH2), 80.7 (CH), 101.5 (CH), 124.3 (2 CH), 127.4 (CH), 130.0 (2 CH), 136.2 (C), 153.8 (C), 215.4 (C). MS: m/z (%) = 250 (7) [M+], 174 (47), 119 (61), 105 (78), 77 (100), 72 (58). Anal. Calcd for C13H14OS2 (250.38): C, 62.36; H, 5.64; S, 25.61. Found: C, 62.56; H, 5.78; S, 25.69.