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1 Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry. This journal is The Royal Society of Chemistry 2014 Supporting information Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazoles synthesis Fengtian Wu, Jie Zhang, Qianbing Wei, Ping Liu, Jianwei Xie*, Haojie Jiang and Bin Dai School of Chemistry and Chemical Engineering / Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi , China cesxjw@gmail.com Table of Contents Page no. General information Optimization of ligands for intramolecular O-arylation of N-(2-bromophenyl)benzamide...2 General procedure for benzoxazoles synthesis via intramolecular O-arylation..3 General procedure for benzoxazoles synthesis via domino C-N/C-O coupling reaction 3 The 1 H NMR and 13 C NMR spectra datas of the benzoxazoles Copies of 1 H NMR and 13 C NMR spectra of the benzoxazoles
2 General information All reagents were purchased from commercial suppliers and used without further purification. Column chromatography was performed with silica gel ( mesh) purchased from Qingdao Haiyang Chemical Co. Ltd. Thin-layer chroma-tography was carried out with Merck silica gel GF254 plates. All 2-substituted benzoxazoles were characterized by 1 H NMR, 13 C NMR and MS, which were compared with the previously reported data. NMR spectra were recorded at room temperature on a Bruker Avance III HD 400 instrument at 400 MHz for 1 H NMR and 100 MHz for 13 C NMR. Mass spectra were recorded on GC-MS (Agilent 7890A/5975C) instrument under EI model. Optimization of ligands for intramolecular O-arylation of N-(2-bromophenyl)benzamide: Table 1. Optimization of ligands O N H OH L1 NH 2 H N O Br 1a Ph O N H OH CuI, L KOH, DMF 90 C, 12 h H N O O N H NH 2 L2 L3 L4 L5 N O 2a Ph O O O O O O Entry Ligand Yield (%) b Entry Ligand Yield (%) b 1 L L L L L3 35 a Reaction conditions: N-(2-bromophenyl)benzamide (0.5 mmol), CuI (10 mol%), L (20 mol%), KOH (1.0 mmol), DMF (1.0 ml), 90 C, 12 h. b Isolated yield. 2
3 General procedure for benzoxazoles synthesis via intramolecular O-arylation: To a 10 ml of tube was added CuI (0.05 mmol), L (0.1 mmol), N-(2-halophenyl)benzamide (0.5 mmol), K 3 PO 4 (1.0 mmol) and anhydrous DMF (1 ml). The tube was then sealed with a rubber septum without inert atmosphere and heated at 90 C (for 2-iodoanilides and 2-bromoanilides) or 135 C (for 2-chloroanilides) in a preheated oil bath for 12 h. The reaction mixture was cooled to room temperature, diluted with 10 ml water and extracted with ethyl acetate (3 20 ml). The combined organic phase was washed with water and brine, dried over anhydrous Na 2 SO 4, and concentrated in vacuo. The residue was purified by flash column chromatograph on silica gel (ethyl acetate/petroleum ether as the eluent) to afford the target products. General procedure for benzoxazoles synthesis via domino C-N/C-O coupling reaction: To a 10 ml of tube was added CuI (0.05 mmol), L (0.1 mmol), benzamides (0.75 mmol), 1,2-dihalobenzene (0.5 mmol), K 3 PO 4 (1.0 mmol) and anhydrous DMF (1 ml). The tube was then sealed with a rubber septum without inert atmosphere and heated at 135 C in a preheated oil bath for 12 h. The reaction mixture was cooled to room temperature, diluted with 10 ml water and extracted with ethyl acetate (3 20 ml). The combined organic phase was washed with water and brine, dried over anhydrous Na 2 SO 4, and concentrated in vacuo. The residue was purified by flash column chromatograph on silica gel (ethyl acetate/petroleum ether as the eluent) to afford the target products. 3
4 The 1 H NMR and 13 C NMR spectra datas of the benzoxazoles. 2-Phenylbenzo[d]oxazole 1 (2a) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), (m, 1H), (m, 4H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.1, 150.8, 142.2, 131.6, 129.0, 127.7, 127.3, 125.2, 124.7, 120.1, GC-MS (EI): m/z = 195 [M] +. 2-p-Tolylbenzo[d]oxazole 2 (2b) White solid. m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), (m, 1H), (m, 1H), (m, 4H), 2.44 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.4, 150.8, 142.3, 142.1, 129.7, 127.7, 124.9, 124.6, 124.5, 119.9, 110.6, GC-MS (EI): m/z = 209 [M] +. 2-m-Tolylbenzo[d]oxazole 3 (2c) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ 8.09 (s, 1H), 8.05 (d, J = 7.6 Hz, 1H), (m, 1H), (m, 1H), 7.40 (t, J = 7.6 Hz, 1H), (m, 3H), 2.45 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.3, 150.8, 142.2, 138.8, 132.4, 128.9, 128.2, 127.1, 125.1, 124.8, 124.6, 120.0, 110.6, GC-MS (EI): m/z = 209 [M] +. 2-o-Tolylbenzo[d]oxazole 1 (2d) 4
5 White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 1H), (m, 1H), (m, 1H), (m, 5H), 2.83 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.5, 150.4, 142.2, 139.0, 131.9, 131.0, 130.0, 126.3, 126.2, 125.1, 124.5, 120.2, 110.6, GC-MS (EI): m/z = 209 [M] +. 2-(4-Methoxyphenyl)benzo[d]oxazole 1 (2e) White solid, m.p.:52-54 C. 1 H NMR (400 MHz, CDCl 3 ) : δ 8.19 (d, J = 8.4 Hz, 2H), (m, 1H), (m, 1H), (m, 2H), 7.02 (d, J = 8.8 Hz, 2H), 3.88 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.3, 162.4, 150.8, 142.4, 129.5, 124.7, 124.5, 119.8, 119.7, 114.5, 110.5, GC-MS (EI): m/z = 225 [M] +. 2-(4-Fluorophenyl)benzo[d]oxazole 4 (2f) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ) : δ (m, 2H), (m, 1H), (m, 1H), (m, 2H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ): δ 166.2, 163.7, 162.3, 150.9, 142.2, (d, J = 8.8 Hz), 125.3, 124.8, (d, J = 3.2 Hz), 120.1, (d, J = 22.1 Hz), GC-MS (EI): m/z = 213 [M] +. 4-(Benzo[d]oxazol-2-yl)benzonitrile 5 (2g) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), (m, 3H), (m, 1H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ): δ 161.0, 151.0, 142.0, 132.8, 131.2, 128.1, 126.3, 125.2, 120.7, 118.3, 114.8, GC-MS (EI): m/z = 220 [M] +. 5
6 (E)-2-styrylbenzo[d]oxazole 5 (2h) Yellow solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ 7.80 (d, J = 16.4 Hz, 1H), (m, 1H), (m, 2H), (m, 1H), (m, 5H), 7.09 (d, J = 16.4 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ): δ 162.9, 150.5, 142.3, 139.6, 135.3, 129.9, 129.1, 127.7, 125.3, 124.6, 120.0, 114.1, GC-MS (EI): m/z = 221 [M] +. 2-Undecylbenzo[d]oxazole 6 (2i) Pale yellow oli. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 1H), (m, 1H), (m, 2H), 2.92 (t, J = 7.6 Hz, 2H), 1.89 (apparent quintet, J = 7.6 Hz, 2H), (m, 16H), 0.88 (t, J = 7.6 Hz, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 167.4, 150.9, 141.5, 124.5, 124.2, 119.7, 110.4, 32.0, 29.7, 29.6, 29.5, 29.4, 29.3, 28.8, 26.9, 22.8, GC-MS (EI): m/z = 273 [M] +. 2-(4-Chlorophenyl)benzo[d]oxazole 1 (2j) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), (m, 1H), (m, 1H), (m, 2H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ): δ 162.2, 150.9, 142.2, 137.9, 129.4, 129.0, 125.8, 125.5, 124.9, 120.2, GC-MS (EI): m/z = 229 [M] +. 6-Bromo-2-phenylbenzo[d]oxazole 7 (2k) 6
7 White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), 7.76 (d, J = 1.6 Hz, 1H), 7.63 (d, J = 8.4, 1H), (m, 3H), 7.48 (q, J = 2.0 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.5, 151.2, 141.4, 131.9, 129.0, 128.0, 127.7, 126.7, 121.0, 118.0, GC-MS (EI): m/z = 273 [M] +. 6-Bromo-2-p-tolylbenzo[d]oxazole 7 (2l) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ ( m, 2H), 7.74 (d, J = 2.0 Hz, 1H), 7.61 (d, J = 8.4 Hz, 1H), 7.45 (dd, J = 8.4, 2.0 Hz, 1H), 7.33 (d, J = 8.8 Hz, 2H), 2.44 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.9, 151.3, 142.6, 141.5, 129.8, 128.0, 127.8, 124.0, 120.9, 117.8, 114.1, GC-MS (EI): m/z = 287 [M] +. 6-Bromo-2-m-tolylbenzo[d]oxazole 7 (2m) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ 8.06 (m, 1H), 8.02 (d, J = 7.6 Hz, 1H), 7.74 (dd, J = 1.6, 0.4 Hz, 1H), 7.62 (dd, J = 8.4, 0.4 Hz, 1H), (m, 1H), 7.42 (t, J = 3.6 Hz, 1H), (m, 1H) 2.46 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.9, 151.3, 141.5, 139.0, 132.9, 129.0, 128.4, 128.1, 126.7, 125.0, 121.0, 118.0, 114.2, GC-MS (EI): m/z = 287 [M] +. 6-Chloro-2-p-tolylbenzo[d]oxazole 3 (2n) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), 7.65 (dd, J = 8.4, 0.4 Hz, 1H), 7.58 (dd, J = 1.6, 0.4 Hz, 1H), (m, 3H), 2.45 (s, 3H); 13 C NMR 7
8 (100 MHz, CDCl 3 ): δ 164.0, 150.9, 142.5, 141.1, 130.5, 129.8, 127.7, 125.2, 124.0, 120.3, 111.2, GC-MS (EI): m/z = 243 [M] +. 6-Chloro-2-m-tolylbenzo[d]oxazole 3 (2o) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ 8.03 (s, 1H), 7.99 (d, J = 7.6 Hz, 1H), 7.64 (d, J = 8.4 Hz, 1H), 7.55 (d, J = 1.6 Hz, 1H), 7.39 (t, J = 7.6 Hz, 1H), (m, 2H), 2.44 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 164.0, 151.1, 141.1, 138.9, 132.7, 130.7, 129.0, 128.3, 126.6, 125.3, 124.9, 120.4, 111.3, GC-MS (EI): m/z = 243 [M] +. 6-Chloro-2-o-tolylbenzo[d]oxazole 3 (2p) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 1H), 7.70 (dd, J = 4.4, 0.4 Hz, 1H), 7.60 (dd, J = 2.0, 0.4 Hz, 1H), (m, 1H), (m, 3H), 2.80 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 164.1, 150.5, 141.1, 139.1, 132.0, 131.3, 130.7, 130.0, 126.2, 125.8, 125.2, 120.7, 111.2, GC-MS (EI): m/z = 243 [M] +. 6-Chloro-2-(4-methoxyphenyl)benzo[d]oxazole 8 (2q) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), 7.63 (dd, J = 8.4, 0.4 Hz, 1H), 7.56 (dd, J = 6.0, 0.4 Hz, 1H), 7.31 (dd, J = 8.4, 2.0 Hz, 1H), (m, 2H), 3.90 (s, 3H); 13 C NMR (100 MHz, CDCl 3 ): δ 164.0, 162.7, 151.0, 141.2, 130.2, 129.6, 125.2, 120.2, 119.3, 114.6, 111.2, GC-MS (EI): m/z = 259 [M] +. 8
9 6-Chloro-2-phenylbenzo[d]oxazole 3 (2r) Pale pink solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), 7.68 (dd, J = 8.4, 0.4 Hz, 1H), 7.60 (dd, J = 2.0, 0.4 Hz, 1H), (m, 3H), 7.34 (dd, J = 8.8, 2.0 Hz, 1H); 13 C NMR (100 MHz, CDCl 3 ): δ 163.8, 151.1, 141.0, 131.9, 130.8, 129.1, 127.8, 126.8, 125.4, 120.6, GC-MS (EI): m/z = 229 [M] +. 6-Chloro-2-(4-fluorophenyl)benzo[d]oxazole 3 (2s) White solid, m.p.: C. 1 H NMR (400 MHz, CDCl 3 ): δ (m, 2H), 7.67 (d, J = 8.4 Hz, 1H), 7.59 (dd, J = 2.0, 0.4 Hz, 1H), 7.35 (dd, J = 8.4, 2.0 Hz, 1H), (m, 2H); 13 C NMR (100 MHz, CDCl 3 ): δ (d, J = Hz), (d, J = 1.0 Hz), 151.0, 141.0, 130.8, (d, J = 8.8 Hz), 125.5, (d, J = 3.3 Hz), 120.5, (d, J = 22.1 Hz), GC-MS (EI): m/z = 247 [M] +. References 1 A. B. Naidu and G. Sekar, Synthesis, 2010, 4, P. Saha, M. A. Ali, P. Ghosh and T. Punniyamurthy, Org. Biomol. Chem., 2010, 8, Y. Leng, F. Yang, W. Zhu, Y. Wu and X. Li, Org. Biomol. Chem., 2011, 9, L. Wan, Z.-G. Ma, X.-J. Wei, Q.-Y. Meng, D.-T. Yang, S.-F. Du, Z.-F. Chen, L.-Z. Wu and Q. Liu, Green Chem., 2014, 16, G. Evindar and R. A. Batey, J. Org. Chem., 2006, 71, R. D. Viirre, G. Evindae and R. A. Batey, J. Org. Chem., 2008, 73, Y. Leng, F. Yang, W. Zhu, D. Zou, Y. Wu and R. Cai, Tetrahedron, 2011, 67, A. M. Hamdy, N. Eleya, H. H. Mohammed, T. Patonay, A. Spannenber and P. Langer, Tetrahedron, 2013, 69,
10 Copies of 1 H NMR and 13 C NMR spectra of the benzoxazoles. 2-Phenylbenzo[d]oxazole (2a) 10
11 2-p-Tolylbenzo[d]oxazole (2b) 11
12 2-m-Tolylbenzo[d]oxazole (2c) 12
13 2-o-Tolylbenzo[d]oxazole (2d) 13
14 2-(4-Methoxyphenyl)benzo[d]oxazole (2e) 14
15 2-(4-Fluorophenyl)benzo[d]oxazole (2f) 15
16 4-(Benzo[d]oxazol-2-yl)benzonitrile (2g) 16
17 (E)-2-styrylbenzo[d]oxazole (2h) 17
18 2-Undecylbenzo[d]oxazole (2i) 18
19 2-(4-Chlorophenyl)benzo[d]oxazole (2j) 19
20 6-Bromo-2-phenylbenzo[d]oxazole (2k) 20
21 6-Bromo-2-p-tolylbenzo[d]oxazole (2l) 21
22 6-Bromo-2-m-tolylbenzo[d]oxazole (2m) 22
23 6-Chloro-2-p-tolylbenzo[d]oxazole (2n) 23
24 6-Chloro-2-m-tolylbenzo[d]oxazole (2o) 24
25 6-Chloro-2-o-tolylbenzo[d]oxazole (2p) 25
26 6-Chloro-2-(4-ethoxyphenyl)benzo[d]oxazole (2q) 26
27 6-Chloro-2-phenylbenzo[d]oxazole (2r) 27
28 6-Chloro-2-(4-fluorophenyl)benzo[d]oxazole (2s) 28
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