ESI for. A simple and efficient protocol for the palladium-catalyzed. ligand-free Suzuki reaction at room temperature in aqueous DMF.
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- Στράτων Ἀλεξανδρεύς Δάβης
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1 ESI for A simple and efficient protocol for the palladium-catalyzed ligand-free Suzuki reaction at room temperature in aqueous DMF Chun Liu,* Qijian i, Fanying Bao and Jieshan Qiu State Key Laboratory of Fine Chemicals, Dalian University of Technology, Linggong Road 2, Dalian , P R China, Fax: (+) ; chunliu70@yahoo.com Contents Materials, Methods and Experimental Procedures Control Experiments in Different Conditions S1 S1-S2 Characterization Data S2-S5 1 H MR Spectra for all Cross-Coupling Products S6-S20 Materials and Methods Unless stated otherwise, all the reactions were carried out under air. All aryl halides and arylboronic acids were purchased from Alfa Aesar, Avocado. All other chemicals were purchased from commercial sources and used without further purification. MR spectra were recorded on a Varian Inova 400 spectrometer. Chemical shifts are reported in ppm relative to TMS. All products were isolated by short chromatography on a silica gel (200~300 mesh) column using petroleum ether (60~90 C), unless otherwise noted. Experimental Procedure A mixture of aryl bromide (0.5 mmol), arylboronic acid (0.75 mmol), PdCl 2 (025 mmol, 0.44 mg), K 2 CO 3 (1 mmol), distilled water (2 ml) and DMF (2 ml) was stirred at room temperature under air for the indicated time. The mixture was added to brine (15 ml) and extracted four times with diethyl ether (4 15 ml). The solvent was concentrated under vacuum and the product was isolated by short chromatography on a silica gel (200~300 mesh) column. Control Experiments in Different Conditions The Suzuki Reaction of -Heteroaryl Halides with Arylboronic Acids: PdCl 2 (075 mmol, 1.32 mg), K 3 PO 4 7H 2 O (1 mmol) were used instead of PdCl 2 (025 mmol, 0.44 mg), K 2 CO 3 (1 mmol) in the above procedure. Suzuki reaction performed in nitrogen: Both the solid materials such as aryl halides, arylboronic acids, base and catalyst and solvent (DMF and water) were all degassed for three times. And then the mixture of them was stirred at 25 C for indicated time. The mixture was added to brine (15 ml) S-1
2 and extracted four times with diethyl ether (4 15 ml). The solvent was concentrated under vacuum and the product was isolated by short chromatography on a silica gel (200~300 mesh) column. Characterization Data 4-methoxybiphenyl 1 1 H MR (400 MHz, CDCl 3, TMS): δ 7.54 (t, J = 8.0 Hz, 4H), 7.42 (t, J = 7.6 Hz, 2H), 7.31 (d, J = 7.2 Hz, 1H), 6.98 (d, J = 8.8 Hz, 2H), 3.86 (s, 3H), ppm. 4-methylbiphenyl 2 1 H MR (400 MHz, CDCl 3, TMS): δ 7.58 (d, J = 7.6 Hz, 2H), 7.50 (d, J = 8.4 Hz, 2H), 7.44 (t, J = 7.2 Hz, 2H), 7.33 (t, J = 6.8 Hz, 1H), 7.25 (t, J = 3.2 Hz, 2H), 2.41 (s, 3H), ppm. 4-phenylbenzonitrile 2 1 H MR (400 MHz, CDCl 3, TMS): δ 7.00 (m, 4H), 7.59 (d, J = 7.6 Hz, 2H), 7.50 (t, J = 7.2Hz, 2H), 7.45 (t, J = 9.2 Hz, 1H), ppm. 4-acetylbiphenyl 3,4 1 H MR (400 MHz, CDCl 3, TMS): δ 8.04 (d, J = 8.0 Hz, 2H), 7.69 (d, J = 8.0 Hz, 2H), 7.63 (d, J = 7.4 Hz, 2H), 7.48 (t, J = 7.4 Hz, 2H), 7.41 (t, J = 7.2 Hz, 1H), 2.62 (s, 3H), ppm. 4-methoxyl-4'-methylbiphenyl 5 1 H MR (400 MHz, CDCl 3, TMS): δ 7.48 (d, J = 8.8 Hz, 2H), 7.42 (d, J = 8.0 Hz, 2H), 7.20 (d, J = 8.0 Hz, 2H), 6.94 (d, J = 8.8 Hz, 2H), 3.82 (s, 3H), 2.36 (s, 3H), ppm. 4-methoxyl-3'-methylbiphenyl 6 1 H MR (400 MHz, CDCl 3, TMS): δ 7.52 (d, J = 9.2 Hz, 2H), 7.33 (m, 3H), 7.12 (d, J = 7.2 Hz, 1H), 6.96 (d, J = 8.8 Hz, 2H), 3.84 (s, 3H), 2.41 (s, 3H), ppm. 4,4'-dimethoxylbiphenyl 7 1 H MR (400 MHz, CDCl 3, TMS): δ 7.48 (d, J = 8.8 Hz, 4H), 6.96 (d, J = 8.8 Hz, 4H), 3.85 (s, 6H), ppm. 4-cyano-4'-methoxybiphenyl 4 1 H MR (400 MHz, CDCl 3, TMS): δ 7.67 (m, J = 6.0 Hz, 4H), 7.54 (d, J = 8.8 Hz, 2H), 7.01 (d, J = 8.8 Hz, 2H), 3.75 (s, 3H), ppm. 4-methoxyl-4'-fluorobiphenyl 5 1 H MR (400 MHz, CDCl 3, TMS): δ 7.50 (m, 4H), 7.10 (t, J = 8.8 Hz, 2H), 6.98 (d, J = 8.8 Hz, 2H), 3.85 (s, 3H), ppm. S-2
3 4-acetyl-4'-fluorobiphenyl 8 1 H MR (400 MHz, CDCl 3, TMS): δ 8.03 (d, J = 8.4 Hz, 2H), 7.64 (d, J = 2.0 Hz, 2H), 7.59 (m, J = 3.2 Hz, 2H), 7.16 (t, J = 6.0 Hz, 2H), 2.54 (s, 3H), ppm. 4'-methoxy-4-biphenylaldehyde 5 1 H MR (400 MHz, CDCl 3, TMS): δ 15 (s, 1H), 7.95 (d, J =8.0 Hz, 2H), 7.70 (d, J =8.0 Hz, 2H), 7.60 (d, J =8.8 Hz, 2H), 7.0 (d, J =8.8 Hz, 2H), 3.85 (s, 3H), ppm. 2-methylbiphenyl 9 1 H MR (400 MHz, CDCl 3, TMS): δ (m, 2H), (m, 3H), (m, 4H), 2.25 (s, 3H), ppm. 2-methoxylbiphenyl 2 1 H MR (400 MHz, CDCl 3, TMS): δ (m, 9H), 3.81 (s, 3H), ppm. 2-phenylbenzonitrile 6 1 H MR (400 MHz, CDCl 3, TMS): δ 7.75 (d, J = 6.8 Hz, 1H), 7.63 (t, J = 8.4 Hz, 1H), (m, 7H), ppm. 2-cyano-4'-methylbiphenyl 3 1 H MR (400 MHz, CDCl 3, TMS): δ 7.74 (d, J = 7.6 Hz, 1H), 7.61 (t, J = 7.6 Hz, 1H), 7.48 (d, J = 8.0 Hz, 1H), 7.45 (d, J = 8.0 Hz, 2H), 7.40 (t, J =7.6 Hz, 1H), 7.28 (d, J =8.0 Hz, 2H), 2.41 (s, 3H), ppm. 4-methoxyl-2'-methylbiphenyl 6 1 H MR (400 MHz, CDCl 3, TMS): δ (m, 6H), 6.92 (d, J = 8.4 Hz, 2H), 3.80 (s, 3H), 2.26 (s, 3H), ppm. 2,4'-dimethoxybiphenyl 5 1 H MR (400 MHz, CDCl 3, TMS): δ 7.47 (d, J = 9.2 Hz, 2H), 7.29 (t, J = 3.2 Hz, 2H), (m, 4H), 3.84 (s, 3H), 3.81 (s, 3H), ppm. 2,2'-dimethoxybiphenyl 7 1 H MR (400 MHz, CDCl 3, TMS): δ (m, 4H), 7.00 (m, 2H), 3.75 (s, 6H), ppm. 2-phenylpyridine 10 1 H MR (400 MHz, CDCl 3, TMS): δ 8.70 (d, J = 4.4 Hz, 1H), 7.99 (d, J = 7.2 Hz, 2H), 7.75 (m, 2H), (m, 3H), (m, 1H), ppm. 2-p-tolylpyridine 10 1 H MR (400 MHz, CDCl 3, TMS): δ 8.66 (d, J = 4.8 Hz, 1H), 7.90 (d, J = 8.0 Hz, 2H), (m, 2H), 7.28 (d, J = 8.0 Hz, 2H), (m, 1H), 2.41 (s, 3H), S-3
4 ppm. 2-(4-methoxyphenyl)pyridine 10 1 H MR (400 MHz, CDCl 3, TMS): δ 8.66 (d, J = 4.4 Hz, 1H), 7.95 (d, J = 8.8 Hz, 2H), (m, 2H), 7.17 (t, J = 6.0 Hz, 1H), 7.01 (d, J = 8.8 Hz, 2H), 3.86 (s, 3H), ppm. 2-(4-fluorophenyl)pyridine 10 1 H MR (400 MHz, CDCl 3, TMS): δ 8.66 (d, J = 4.8 Hz, 1H), (m, 2H), (m, 2H), (m, 3H), ppm. 2-methoxyl-5-phenylpyridine 11 1 H MR (400 MHz, CDCl 3, TMS): δ 8.39 (s, 1H), 7.78 (d, J = 8.4 Hz, 1H), (m, 2H), 7.43 (t, J = 7.6 Hz, 2H), 7.34 (t, J = 7.2 Hz, 1H), 6.81 (d, J = 8.4 Hz, 1H), 3.98 (s, 3H), ppm. 2-methoxy-5-p-tolyl-pyridine 1 H MR (400 MHz, CDCl 3, TMS): δ 8.36 (d, J = 2.4 Hz, 1H), 7.28 (dd, 1H), 7.39 (d, J = 8.0 Hz, 2H), 6.96 (t, J = 4.0 Hz, 2H), 6.78 (d, J = 8.8 Hz, 1H), 3.96 (s, 3H), 2.96 (s, 3H), ppm; 13 C MR δ 163.5, 144.8, 137.4, 137.2, 13, 130.1, 129.7, , 110.8, 53.6, 21.2, ppm. 2-methoxyl-5-(4-fluorophenyl)pyridine 1 H MR (400 MHz, CDCl 3, TMS): δ 8.33 (d, J = 2.4 Hz, 1H), 7.74 (dd, J = 8.4, 2.4 Hz, 1H), (m, 2H), (m, 2H), 6.81 (d, J = 8.4, 1H), 3.98 (s, 3H), ppm; 13 C MR δ (d, J = 8.0 Hz), 161.2, 144.8, 137.4, (d, J = 3.0 Hz), 129.2, (d, J = 8. 0 Hz), (d, J = 22.0 Hz), 110.9, 53.57, ppm; MS (EI) m/z 203 (M +, 100%): 204, 175, 172, 146, 133, 132, 107, 83, 63. Melting Point: methoxyl-5-(2-methyl phenyl)pyridine 1 H MR (400 MHz, CDCl 3, TMS): δ 8.13 (d, J = 2.8 Hz, 1H), 7.54 (dd, J = 8.8, 2.4 Hz, 1H), (m, 4H), 6.79 (d, J = 8.4, 1H), 3.98 (s, 3H), 2.27 (s, 3H), ppm; 13C MR δ 163.3, 146.7, 139.7, 138.3, 135.9, 130.7, 130.6, 130.1, 127.8, 126.2, 110.3, 53.6, 20.6, ppm; MS (EI) m/z 199 (M +, 100%): 200, 198, 170, 169, 167,154, 141, 128, 127, 115, 102, 89, 77, 63, 48, phenylpyrazine 10 1 H MR (400 MHz, CDCl 3, TMS): δ 9.03 (s, 1H), 8.64 (s, 1H), 8.52 (d, J =2.4 Hz, 1H), 8.03 (d, J =7.6 Hz, 2H), 7.54 (m, 3H), ppm. 2-(4-methyl phenyl) pyrazine 10 1 H MR (400 MHz, CDCl 3, TMS): δ 9.01 (s, 1H), 8.61 (s, 1H), 8.48 (d, J = 2.4 Hz, S-4
5 1H), 7.93 (d, J = 8.0 Hz, 2H), 7.52 (d, J = 8.0 Hz, 2H), 2.43 (s, 3H), ppm. Reference (1) C. Deng, S. Guo, Y. Xie and J. Li, Eur. J. Org. Chem., 2007, (2) D. Saha, K. Chattopadhyay and B. Ranu, Tetrahedron Lett., 2009, 50, (3) A. Indolese, Tetrahedron Lett., 1997, 38, (4) Z. Weng, L. Koh and T. Hor, J. Organomet. Chem., 2004, 689, 18. (5) Y. Kitamura, A. Sakurai, T. Udzu, T. Maegawa, Y. Monguchi and H. Sajiki, Tetrahedron, 2007, 63, (6) L. Ackermann, C. Gschrei, A. Althammer and M. Riederer, Chem. Commun., 2006, (7) V. Courtois, R. Barhdadi, M. Troupel and J. Périchon, Tetrahedron, 1997, 53, (8). Bumagin and V. Bykov, Tetrahedron, 1997, 53, (9) T. Mino, Y. Shirae, M. Sakamoto and T. Fujita, J. Org.Chem., 2005, 70, (10) C. Liu and W. Yang, Chem. Commun., 2009, (11) J. Li, Q. Zhu and Y. Xie, Tetrahedron, 2006, 62, S-5
6 1 H MR Spectra for all Cross-Coupling Products O ppm ppm S-6
7 C ppm (f1) O ppm (f1) S-7
8 MeO O S-8
9 MeO OMe C OMe S-9
10 O F F COCH S-10
11 MeO CHO S-11
12 OMe C S-12
13 C O ppm (f1) S-13
14 OMe OMe OMe MeO S-14
15 S-15
16 O F S-16
17 H 3 CO MeO ppm (f1) S-17
18 MeO ppm (f1) F H 3 CO S-18
19 H 3 CO S-19
20 ppm (f1) 1 S-20
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