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DOI: 10.1055/s-2006-944227
CuI/l-Proline-Catalyzed Coupling Reactions of Vinyl Bromides with Activated Methylene Compounds
Publication History
Publication Date:
04 July 2006 (online)
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Abstract
The Ullmann-type coupling reaction of vinyl bromides and activated methylene compounds under CuI/l-proline in DMSO, at 90 °C in the presence of Cs2CO3 gives the corresponding vinyl compounds in moderate to good yields. This is a good method for preparing compounds with multiple functional groups including double bonds, carbonyls, and/or esters.
Key words
carbon-carbon coupling reaction - Ullmann-type reaction - activated methylene compounds - copper iodide - vinyl bromide
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References and Notes
Typical Procedure: A two-necked flask was charged with vinyl bromide (0.5 mmol), CuI (0.05 mmol), l-proline (0.1 mmol), and Cs2CO3 (1.0 mmol), evacuated, and backfilled with nitrogen. The activated methylene compound (1.0 mmol) and DMSO (2 g) were added under nitrogen. The flask was immersed in a pre-heated oil bath, and the reaction mixture was stirred at 90 °C until the conversion was complete (detected by TLC). The cooled mixture was purified by column chromatography on silica gel (PE-EtOAc, 10:1 to 5:1) to provide the desired product.
(
E
)-3-Styrylpentane-2,4-dione (Table
[2]
, entry 1): IR (film): 3429.1, 3062.4, 3029.7, 2927.2, 1709.1, 1600.9, 1495.2, 1450.2, 1357.4, 1204.9, 1143.7, 1025.8, 976.2, 751.0, 699.4 cm-1. 1H NMR (400 MHz, CDCl3): δ = 2.21 (6 H, s, CH3), 6.41 (1 H, d, J = 16.4 Hz, CH), 6.74 (1 H, d, J = 16.4 Hz, CH), 7.34-7.43 (5 H, m, ArH) 16.75 (1 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 24.23, 111.30, 122.73, 126.05, 127.65, 128.66, 134.16, 137.02, 191.16. MS (70 eV): m/z (%) = 209.0992 (43), 176.0828 (100). HRMS (70 eV): m/z calcd for C13H14O2, 202.0988; found: 202.0992.
(
E
)-Ethyl-2-acetyl-4-phenylbut-3-enoate (Table
[2]
, entry 2): IR (film): 3459.6, 3061.9, 3029.3, 2982.8, 2936.7, 1732.5, 1599.7, 1449.9, 1368.5, 1247.5, 1079.8, 1018.0, 757.9, 699.6 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.29 (1.2 H, t, J = 7.2 Hz, CH3), 1.35 (1.8 H, t, J = 7.2 Hz, CH3), 2.22 (1.8 H, s, CH3), 2.28 (1.2 H, s, CH3), 4.23 (0.8 H, q, J = 7.2 Hz, CH2), 4.24 (0.4 H, s, CH), 4.30 (1.2 H, q, J = 7.2 Hz, CH2), 6.42 (0.4 H, dd, J = 16.0, 9.2 Hz, CH), 6.58 (0.4 H, d, J = 16.0 Hz, CH), 6.60 (0.6 H, d, J = 16.0 Hz, CH), 6.74 (0.6 H, d, J = 16.0 Hz, CH), 7.31-7.42 (5 H, m, ArH), 13.37 (0.6 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 14.03, 14.19, 20.28, 28.45, 60.92, 61.68, 63.87, 101.28, 120.99, 121.57, 125.91, 126.56, 127.04, 128.18, 128.54, 128.60, 130.62, 135.36, 135.99, 138.03, 168.41, 172.63, 174.64, 201.38. MS (70 eV): m/z (%) = 232.1099 (84) [M+], 205.0856 (100), 190.0986 (97), 171.0440 (62). HRMS (70 eV): m/z calcd for C14H16O3: 232.1094; found: 232.1099.
(
E
)-Diethyl-2-styrylmalonate (Table
[2]
, entry 3): IR (film): 2983.3, 2938.7, 2909.6, 1732.6, 1465.2, 1449.4, 1369.3, 1258.4, 1151.3, 1033.8, 967.1, 857.8, 757.9, 692.7 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.28 (6 H, t, J = 7.2 Hz, CH3), 4.17-4.26 (5 H, m, CH2, CH), 6.42 (1 H, dd, J = 16.0, 8.8 Hz, CH), 6.59 (1 H, d, J = 16.0 Hz, CH), 7.27-7.42 (5 H, m, ArH). 13C NMR (100 MHz, CDCl3): δ = 13.96, 55.86, 61.40, 120.84, 126.56, 128.01, 128.49, 134.96, 136.04, 167.96. MS (70 eV): m/z (%) = 262.1204 (100) [M+], 190.0989 (53), 189.0911 (28). HRMS (70 eV): m/z calcd for C15H18O4: 262.1200; found: 262.1204.
(
E
)-3-(4-Chlorostyryl)pentane-2,4-dione (Table
[2]
, entry 5): IR (film): 3055.4, 2913.6, 1443.6, 1071.7, 748.8, 692.1 cm-1. 1H NMR (400 MHz, CDCl3): δ = 2.22 (6 H, s, CH3), 6.36 (1 H, d, J = 16.4 Hz, CH), 6.72 (1 H, d, J = 16.4 Hz, CH), 7.30-7.36 (4 H, m, ArH) 16.78 (1 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 24.27, 111.12, 123.38, 127.23, 128.78, 132.74, 133.22, 135.51, 191.20. MS: m/z (%) = 236.0601 (100) [M+], 238.0575 (35) [M+ + 2], 221.0365 (30). HRMS (70 eV): m/z calcd for C13H13ClO2: 236.0599; found: 236.0601.
(
E
)-Ethyl-2-acetyl-4-(4-chlorophenyl)but-3-enoate (Table
[2]
, entry 6): IR (film): 3471.5, 2982.2, 2929.3, 1722.1, 1592.1, 1491.8, 1368.8, 1247.0, 1092.0, 1013.7, 974.4, 828.9 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.30 (1.2 H, t, J = 7.2 Hz, CH3), 1.36 (1.8 H, t, J = 7.2 Hz, CH3), 2.22 (1.8 H, s, CH3), 2.29 (1.2 H, s, CH3), 4.24 (0.8 H, q, J = 7.2 Hz, CH2), 4.25 (0.4 H, s, CH), 4.30 (1.2 H, q, J = 7.2 Hz, CH2), 6.40 (0.4 H, dd, J = 16.0, 8.8 Hz, CH), 6.52 (0.4 H, d, J = 16.0 Hz, CH), 6.56 (0.6 H, d, J = 16.0 Hz, CH), 6.71 (0.6 H, d, J = 16.0 Hz, CH), 7.27-7.34 (4 H, m, ArH), 13.41 (0.6 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 14.04, 14.22, 20.32, 28.56, 61.02, 61.81, 63.72, 76.61, 101.10, 121.67, 122.15, 127.06, 127.77, 128.66, 128.79, 129.09, 132.50, 134.07, 134.48, 136.58, 168.27, 172.53, 175.02, 201.13. MS (70 eV): m/z (%) = 216.1146 (100) [M+], 268.0679 (38) [M+ + 2], 240.0554 (40), 224.0598 (80), 220.0288 (74), 207.0022 (42), 205.0052 (98). HRMS (70 eV): m/z calcd for C14H15ClO3: 266.0704; found: 216.1146.
(
E
)-Diethyl-2-(4-chlorostyryl)malonate (Table
[2]
, entry 7): IR (film): 2983.7, 2934.6, 1732.7, 1492.2, 1465.7, 1446.6, 1369.5, 1256.7, 1151.2, 1094.7, 1035.1, 968.7, 821.9 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.29 (6 H, t, J = 7.2 Hz, CH3), 4.16-4.26 (5 H, m, CH2, CH), 6.40 (1 H, dd, J = 16.0, 8.8 Hz, CH), 6.55 (1 H, d, J = 16.0 Hz, CH), 7.28-7.35 (4 H, m, ArH). 13C NMR (100 MHz, CDCl3): δ = 13.89, 55.66, 61.33, 121.49, 127.71, 128.59, 133.65, 134.50, 167.73. MS (70 eV): m/z (%) = 296.0818 (100) [M+], 298.0784 (32) [M+ + 2], 224.0600(80), 223.0522 (35), 178.0181 (40).
HRMS (70 eV): m/z calcd for C15H17ClO4: 296.0810; found: 296.0818.
(
E
)-3-(4-Methylstyryl)pentane-2,4-dione (Table
[2]
, entry 8): IR (film): 3055.4, 2913.6, 1443.6, 1071.7, 748.8, 692.1 cm-1. 1H NMR (400 MHz, CDCl3): δ = 2.21 (6 H, s, CH3), 2.36 (3 H, s, CH3), 6.38 (1 H, d, J = 16.0 Hz, CH), 6.68 (1 H, d, J = 16.0 Hz, CH), 7.16 (2 H, d, J = 8.0 Hz, ArH), 7.16 (2 H, d, J = 8.0 Hz, ArH), 16.71 (1 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 21.18, 24.23, 111.40, 121.72, 125.99, 129.36, 134.17, 134.24, 137.61, 191.13. MS (70 eV): m/z (%) = 216.1148 (100) [M+], 201.0912 (61). HRMS (70 eV): m/z calcd for C14H16O3: 216.1145; found: 216.1148.
(
E
)-Ethyl-2-acetyl-4-
p-
tolylbut-3-enoate (Table
[2]
, entry 9): IR (film): 3459.1, 2981.7, 2923.5, 2868.0, 1721.8, 1639.5, 1604.2, 1513.6, 1369.4, 1245.6, 1061.4, 1019.3, 968.6, 860.4, 817.5 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.29 (1.2 H, t, J = 7.2 Hz, CH3), 1.34 (1.8 H, t, J = 7.2 Hz, CH3), 2.21 (1.8 H, s, CH3), 2.27 (1.2 H, s, CH3), 2.34 (3 H, s, CH3), 4.23 (0.8 H, q, J = 7.2 Hz, CH2), 4.24 (0.3 H, s, CH), 4.28 (1.2 H, q, J = 7.2 Hz, CH2), 6.36 (0.4 H, dd, J = 16.0, 8.8 Hz, CH), 6.54 (0.4 H, d, J = 16.0 Hz, CH), 6.55 (0.6 H, d, J = 16.0 Hz, CH), 6.68 (0.6 H, d, J = 16.0 Hz, CH), 7.13 (2 H, d, J = 8.0 Hz, ArH), 7.29-7.31 (2 H, m, ArH), 13.34 (0.6 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 14.02, 14.19, 20.23, 21.10, 21.17, 28.38, 60.85, 61.61, 63.91, 101.33, 119.90, 120.58, 125.82, 126.46, 129.22, 129.27, 130.66, 133.24, 135.22, 135.25, 136.85, 138.10, 168.51, 172.67, 174.32, 201.51. MS (70 eV): m/z (%) = 246.1254 (72) [M+], 204.1145 (38), 200.0832 (77), 185.0596 (100), 158.0727 (27). HRMS (70 eV): m/z calcd for C15H18O3: 246.1250; found: 246.1254.
(
E
)-Diethyl-2-(4-methylstyryl)malonate (Table
[2]
, entry 10): IR (film): 2982.2, 2937.9, 1732.6, 1513.8, 1463.9, 1446.3, 1368.5, 1293.0, 1257.3, 1177.2, 1096.2, 1032.1, 968.5, 862.0, 812.0 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.28 (6 H, t, J = 7.2 Hz, CH3), 2.33 (3 H, s, CH3), 4.16 (1 H, d, J = 9.2 Hz, CH), 4.23 (4 H, q, J = 7.2 Hz, CH2), 6.42 (1 H, dd, J = 16.0, 9.2 Hz, CH), 6.55 (1 H, d, J = 16.0 Hz, CH), 7.13 (2 H, d, J = 8.0 Hz, ArH), 7.31 (2 H, d, J = 8.0 Hz, ArH). 13C NMR (100 MHz, CDCl3): δ = 14.01, 21.19, 55.94, 61.73, 119.79, 126.50, 129.22, 133.31, 134.89, 137.95, 168.12. MS (70 eV): m/z (%) =(100) [M+], 204.1147 (26), 203.1071 (28), 157.0647 (21), 129.0698 (51). HRMS (70 eV): m/z calcd for C16H20O4: 276.1356; found: 276.1363.
(
E
)-3-(4-Methoxystyryl)pentane-2,4-dione (Table
[2]
, entry 11): IR (film): 3055.4, 2913.6, 1443.6, 1071.7, 748.8, 692.1 cm-1. 1H NMR (400 MHz, CDCl3): δ = 2.21 (6 H, s, CH3), 2.96 (3 H, s, CH3), 6.35 (1 H, d, J = 16.0 Hz, CH), 6.59 (1 H, d, J = 16.0 Hz, CH), 6.89-6.91 (2 H, m, ArH), 7.35-7.37 (2 H, m, ArH), 16.68 (1 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 24.24, 55.34, 111.47, 114.14, 120.57, 127.29, 130.23, 133.88, 140.17, 191.10. MS (70 eV): m/z (%) = 232.1099 (100) [M+], 204.0782 (63), 133.0648 (37). HRMS (70 eV): m/z calcd for C14H16O3: 232.1094; found: 232.1099.
(
E
)-3-(1-Phenylprop-1-en-2-yl)pentane-2,4-dione (Table
[2]
, entry 13): IR (film): 3055.4, 2913.6, 1443.6, 1071.7, 748.8, 692.1 cm-1. 1H NMR (400 MHz, CDCl3): δ = 1.99 (2 H, s, CH3), 2.05 (3 H, d, J = 1.2 Hz, CH3), 2.13 (4 H, s, CH3), 6.42 (0.65 H, s, CH), 6.52 (0.35 H, s, CH), 7.18-7.40 (5 H, m, ArH), 16.40 (0.65 H, s, OH), 16.50 (0.35 H, s, OH). 13C NMR (100 MHz, CDCl3): δ = 20.31, 22.84, 23.17, 27.05, 113.13, 118.18, 126.83, 126.92, 127.73, 128.25, 128.45, 128.64, 131.01, 132.60, 133.04, 133.46, 137.03, 137.34, 189.87, 190.14. MS (70 eV): m/z (%) = 216.1146 (100) [M+], 201.0912 (87), 173.0961 (25). HRMS (70 eV): m/z calcd for C14H16O2: 216.1145; found: 216.1146.