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Synlett 2014; 25(19): 2777-2780
DOI: 10.1055/s-0034-1379231
letter
© Georg Thieme Verlag Stuttgart · New York

Copper(II) Acetate Catalyzed Ullmann-Type C–O Coupling Reaction of Phenols with 4-Tosylcoumarin

Abdolali Alizadeh*
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran   Fax: +98(21)88006544   Email: abdol_alizad@yahoo.com   Email: aalizadeh@modares.ac.ir
,
Rashid Ghanbaripour
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran   Fax: +98(21)88006544   Email: abdol_alizad@yahoo.com   Email: aalizadeh@modares.ac.ir
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Further Information

Publication History

Received: 20 August 2014

Accepted after revision: 11 September 2014

Publication Date:
16 October 2014 (online)

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Abstract

A copper(II) acetate mediated Ullmann-type reaction of phenols with 4-tosylcoumarin for the synthesis of 4-aryloxycoumarins is reported. The method has some attractive features such as operational simplicity, moderate to good yields, and the use of ligand-free copper(II) acetate as a green and stable catalyst.

Key words

coumarins - ligand free - phenols - synthetic methods - Ullmann coupling
 

  • References and Notes

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  • 25 General Procedure: A solution of 4-toluenesulfonyloxycoumarin (1 mmol), phenol (1 mmol), K2CO3 (1.5 mmol), and Cu(OAc)2 (0.1 mmol) in DMF (6 mL), was stirred for 3 h at 80 °C. Upon completion, as monitored by TLC, the reaction mixture was cooled to room temperature and water (20 mL) was added. The mixture was extracted with CH2Cl2 (3 × 10 mL) and dried over anhydrous Na2SO4. The solution was filtered, concentrated, and the residue was purified by column chromatography (EtOAc–hexane, 1:10 v/v) to afford the product 2a–f. 4-Phenoxy-2H-chromene-2-one (2a): Yield: 0.154 g (65%); white powder; mp 99–101 °C. IR (KBr): 1714 (C=O), 1614, 1561 and 1483 (Ar), 1223 and 1183 (C–O) cm–1. 1H NMR (400 MHz, DMSO-d 6): δ = 5.18 (s, 1 H, CH3), 7.39 (d, 3 J H–H = 7.6 Hz, 2 H, CH ortho of Ph), 7.43–7.51 (m, 2 H, ArH), 7.58 (d, 3 J H–H = 7.6 Hz, 2 H, ArH), 7.59 (t, 3 J H–H = 8.0 Hz, 1 H, ArH), 7.77 (td, 3 J H–H = 8.0 Hz, 4 J H–H = 1.6 Hz, 1 H, ArH), 8.07 (dd, 3 J H–H = 8.0 Hz, 4 J H–H = 1.6 Hz, 1 H, ArH). 13C NMR (100 MHz, DMSO-d 6): δ = 92.83 (CH3), 115.18 (C4a), 116.59 (ArH), 121.28 (2 × CH meta of Ph), 123.01 (ArH), 124.52 (CH para of Ph), 126.90 (ArH), 130.60 (2 × CH ortho of Ph), 133.41 (ArH), 152.08 (C8a), 153.08 (C ipso -O), 161.10 (C4), 165.80 (CO2). MS: m/z = 238 [M+], 221, 210, 197, 181, 145, 118, 101, 89, 77, 63. Anal. Calcd for C15H10O3: C, 75.62; H, 4.23. Found: C, 75.69; H, 4.12. 4-(4-Ethylphenoxy)-2H-chromene-2-one (2b): Yield: 0.162 g (61%); yellow powder; mp 100–104 °C. IR (KBr): 1722 (C=O), 1619 and 1491 (Ar), 1179 (C-O) cm–1. 1H NMR (400 MHz, CDCl3): δ = 1.19 (t, 3 J H–H = 7.6 Hz, 3 H, CH3), 2.62 (q, 3 J H–H = 7.6 Hz, 2 H, CH2), 5.35 (s, 1 H, CH3), 6.99 (d, 3 J H–H = 8.4 Hz, 2 H, ArH), 7.21 (d, 3 J H–H = 8.4 Hz, 2 H, ArH), 7.26 (t, 3 J H–H = 8.0 Hz, 1 H, ArH), 7.28 (d, 3 J H–H = 8.0 Hz, 1 H, ArH), 7.52 (td, 3 J H–H = 7.2 Hz, 4 J H–H = 1.2 Hz, 1 H, ArH), 7.94 (d, 3 J H–H = 7.6 Hz, 1 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 15.59 (CH3), 28.32 (CH2), 93.46 (CH3), 115.55 (C4a), 116.82 (ArH), 121.00 (2 × ArH), 123.09 (CH of Ar), 124.03 (ArH), 129.68 (2 × ArH), 132.70 (ArH), 142.97 (C ipso -Et), 150.38 (C8a), 153.71 (C ipso -O), 162.62 (C4), 166.55 (CO2). MS: m/z = 266 [M+], 238, 181, 165, 155, 146, 131, 121, 101, 89, 77, 63. Anal. Calcd for C17H14O3: C, 76.68; H, 5.30. Found: C, 76.72; H, 5.38. 4-(3,5-Dimethylphenoxy)-2H-chromene-2-one (2c): Yield: 0.196 g (74%); yellow powder; mp 109–113 °C. IR (KBr): 1716 (C=O), 1621, 1565 and 1487 (Ar), 1273 and 1223 (C–O) cm–1. 1H NMR (400 MHz, CDCl3): δ = 2.28 (s, 6 H, CH3), 5.38 (s, 1 H, CH3), 6.70 (s, 2 H, ArH), 6.88 (s, 1 H, ArH), 7.26 (t, 3 J H–H = 7.6 Hz, 1 H, ArH), 7.26 (d, 3 J H–H = 7.2 Hz, 1 H, ArH), 7.53 (td, 3 J H–H = 8.0 Hz, 4 J H–H = 1.6 Hz, 1 H, ArH), 7.93 (dd, 3 J H–H = 7.2 Hz, 4 J H–H = 1.6 Hz, 1 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 21.21 (2 × CH3), 93.54 (CH3), 115.59 (C4a), 116.82 (ArH), 118.67 (2 × ArH), 123.05 (ArH), 124.02 (ArH), 128.33 (ArH), 132.65 (ArH), 140.43 (2 × C ipso -Me), 152.45 (C8a), 153.71 (C ipso -O), 162.73 (C4), 166.42 (CO2). MS: m/z = 266 [M+], 249, 238, 195, 155, 145, 121, 105, 91, 77. Anal. Calcd for C17H14O3: C, 76.68; H, 5.30. Found: C, 76.59; H, 5.35. 4-(3-Methylphenoxy)-2H-chromene-2-one (2d): Yield: 0.181 g (72%); beige powder; mp 118–120 °C. IR (KBr): 1715 (C=O), 1621, 1567 and 1484 (Ar), 1240 (C–O) cm–1. 1H NMR (400 MHz, CDCl3): δ = 2.43 (s, 6 H, CH3), 5.46 (s, 1 H, CH3), 6.99 (d, 3 J H–H = 7.6 Hz, 1 H, ArH), 7.00 (s, 1 H, ArH), 7.17 (d, 3 J H–H = 7.6 Hz, 1 H, ArH), 7.38 (t, 3 J H–H = 7.6 Hz, 1 H, ArH), 7.39 (d, 3 J H–H = 8.0 Hz, 1 H, ArH), 7.64 (t, 3 J H–H = 8.0 Hz, 1 H, ArH), 8.05 (d, 3 J H–H = 8.0 Hz, 1 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 21.29 (CH3), 93.58 (CH3), 115.51 (C4a), 116.85 (ArH), 118.13 (ArH), 121.76 (ArH), 123.07 (ArH), 124.05 (ArH), 127.52 (ArH), 130.09 (ArH), 124.05 (ArH), 132.71 (ArH), 140.85 (C ipso -Me), 152.45 (C8a), 153.71 (C ipso -O), 162.66 (C4), 166.37 (CO2). MS: m/z = 252 [M+], 235, 224, 211, 195, 181, 145, 132, 121, 101, 89, 77, 63. Anal. Calcd for C16H12O3: C, 76.18; H, 4.79. Found: C, 76.30; H, 4.75. 4-(4-Fluorophenoxy)-2H-chromene-2-one (2e): Yield: 0.174 g (68%); yellow powder; mp 118–121 °C. IR (KBr): 1722 (C=O), 1621 and 1495 (Ar), 1182 (C-O) cm–1. 1H NMR (400 MHz, CDCl3): δ = 5.31 (s, 1 H, CH3), 7.08–7.17 (m, 2 H, ArH), 7.17–7.19 (m, 2 H, ArH), 7.22–7.31 (m, 2 H, ArH), 7.52-7.57 (m, 1 H, ArH), 7.92–7.95 (m, 1 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 93.61 (CH3), 115.28 (C4a), 117.00 (d, 2 J C–F = 169.0 Hz, 2 × ArH), 117.31 (ArH), 122.84 (d, 3 J C–F = 85.0 Hz, 2 × ArH), 123.00 (ArH), 124.14 (ArH), 132.91 (ArH), 148.28 (C8a), 153.71 (C ipso -O), 160.75 (d, 1 J C–F = 244.0 Hz, C ipso -F), 162.33 (C4), 166.35 (CO2). MS: m/z = 256 [M+], 215, 199, 145, 136, 121, 101, 89, 75, 63. Anal. Calcd for C15H9FO3: C, 70.31; H, 3.54. Found: C, 70.26; H, 3.47. 4-(4-Methoxyphenoxy)-2H-chromene-2-one (2f): Yield: 0.209 g (78%); yellow oil. IR (KBr): 1685 (C=O), 1629, 1509 and 1455 (Ar), 1224 (C–O) cm–1. 1H NMR (400 MHz, CDCl3): δ = 3.78 (s, 3 H, OMe), 5.35 (s, 1 H, CH3), 6.90 (d, 3 J H–H = 9.2 Hz, 2 H, ArH), 7.02 (d, 3 J H–H = 9.2 Hz, 2 H, ArH), 7.27 (t, 3 J H–H = 8.0 Hz, 1 H, ArH), 7.29 (d, 3 J H–H = 8.0 Hz, 1 H, ArH), 7.54 (td, 3 J H–H = 7.6 Hz, 4 J H–H = 0.9 Hz, 1 H, ArH), 7.95 (d, 3 J H–H = 7.6 Hz, 1 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 55.73 (OMe), 93.35 (CH3), 114.49 (C4a), 115.39 (2 × ArH), 116.84 (ArH), 122.10 (2 × ArH), 123.07 (ArH), 124.04 (ArH), 132.06 (ArH), 151.86 (C8a), 152.50 (C ipso -O), 153.70 (C ipso -OMe), 162.68 (C4), 163.31 (CO2). MS: m/z = 268 [M+], 184, 145, 133, 121, 109, 101, 89, 77, 63. Anal. Calcd for C16H12O4: C, 71.64; H, 4.51. Found: C, 71.85; H, 4.37.