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1 Electronic Supplementary Information (ESI) Mild and convenient one-pot synthesis of 2-amino-1,3,4-oxadiazoles promoted by trimethylsilyl isothiocyanate (TMSNCS) Dinneswara Reddy Guda, Hyeon Mo Cho, Myong Euy Lee* Department of Chemistry & Medical Chemistry, College of Science and Technology, Research & Education Center for Advanced Silicon Materials, Yonsei University, Wonju, Gangwon-do , South Korea. M.E.L: address, Contents 1. General Information 2. Experimental Section 3. Spectra 1. General Information Melting points were determined in open capillaries on a Stuart apparatus and are uncorrected. Reagents and solvents were obtained in the highest available purity and used without further purification unless indicated. The purity of the compounds was checked by TLC S1
2 (silica gel, ethyl acetate/hexane (1:3)). The IR spectra were recorded in KBr pellets on a Perkin Elmer Spectrum One FT-IR Spectrometer and the wave numbers were given in cm -1. The 1 H NMR and 13 C NMR spectra were recorded on a Bruker AMX 400 NMR spectrometer in DMSO. Mass spectra were recorded on a low-resolution (Agilent Technologies GC/MS: 6890N, 5973N mass selective detector) EI mass spectrometer. All products 2 were known compounds. 2. Experimental Section Typical experimental procedure for synthesis of 2-Amino-5-aryl-1,3,4-oxadiazole: A mixture of acid hydrazide (1.0 mmol) and trimethylsilyl isothiocyanate (1.0 mmol) and ethanol (10 ml) was refluxed for 2-4 h and then 1 ml of 5N NaOH was added, resulting in the formation of clear solution. To this 5% iodine in potassium iodide solution was added drop wise with stirring till the colour of iodine persisted at room temperature. The reaction mixture was refluxed for additional 1-2 h, cooled and poured into ice-cold water. Resultant solid was filtered on a Buchner funnel and dried. Recrystallization of the solid from ethanol afforded pure products 2a-m. 2-Amino-5-phenyl-1,3,4-oxadiazole (2a) S1 Compound 2a, Yield: 94%, white solid; m.p C (lit. S1 m.p C). IR: (KBr, cm - 1 ) 1022, 1282, 1490, 1597, 1652, 3109, 3266; 1 H NMR (400 MHz, DMSO): δ 7.14 (bs, 2H, NH 2 ) 7.46 (t, 3H, Ph-H), 7.79 (t, 2H, Ph-H). 13 C NMR (100 MHz, DMSO): δ , , , (Aromatic carbons), (C-5), (C-2). GC/MS: m/z (%), 161 (M +, 42), 118 (58), 105 (58), 89 (45), 77 (100), 63 (38), 51 (50). S2
3 2-Amino-5-(p-methylphenyl)-1,3,4-oxadiazole (2b) S1 Compound 2b, Yield: 91%, white solid; m.p C (lit. S1 m.p C). IR: (KBr, cm - 1 ) 1031, 1289, 1487, 1593, 1657, 2951, 3092, 3273; 1 H NMR (400 MHz, DMSO): δ 2.32 (s, 3H Ph-CH 3 ), δ 6.82 (bs, 2H, NH 2 ), 7.20 (d, 2H, Ph-H), 7.65 (d, 2H, Ph-H). 13 C NMR (100 MHz, DMSO): δ (CH 3 ), , , , (Aromatic carbons), (C-5), (C-2). GC/MS: m/z (%), 175 (M +, 100), 132 (43), 119 (58), 91 (53), 77 (11), 65 (17). 2-Amino-5-(p-chlorophenyl)-1,3,4-oxadiazole (2c) S1 Compound 2c, Yield: 92 %, white solid; m.p C (lit. S1 m.p C). IR: (KBr, cm - 1 ) 1023, 1272, 1481, 1594, 1643, 3081, 3285; 1 H NMR (400 MHz, DMSO): δ 7.30 (bs, 2H, NH 2 ), δ 7.56 (d, 2H, Ph-H), 7.79 (d, 2H, Ph-H). 13 C NMR (100 MHz, DMSO): δ , , , (Aromatic carbons), (C-5), (C-2). GC/MS: m/z (%), 195 (M +, 85), 152 (60), 139 (96), 111 (82), 75 (100), 50 (38). 2-Amino-5-(p-methoxyphenyl)- 1,3,4-oxadiazole (2d) S1 S3
4 Compound 2d, Yield: 91 %, brown solid; m.p C (lit. S1 m.p C). IR: (KBr, cm- 1 ) 1036, 1293, 1498, 1581, 1655, 2981, 3102, 3262; 1 H NMR (400 MHz, DMSO): δ 3.81 (s, 3H, OCH 3 ) 7.07 (d, 2H, Ph-H), 7.14 (bs, 2H, NH 2 ), 7.72 (d, 2H, Ph-H). 13 C NMR (100 MHz, DMSO): δ (OCH 3 ), , , , (Aromatic carbons), (C-5), (C-2). GC/MS: m/z (%), 191 (M +, 100), 148 (17), 135 (62), 105 (16), 77 (14), 63 (7). 2-Amino-5-(p-nitrophenyl) -1,3,4-oxadiazole (2e) S1 Compound 2e, Yield 88 %, brown solid; m.p C (lit. S1 m.p C). IR: (KBr, cm - 1 ) 1036, 1290, 1346, 1479, 1524, 1597, 1655, 3142, 3273; 1 H NMR (400 MHz, DMSO): δ 7.44 (bs, 2H, NH 2 ), 8.01 (d, 2H, Ph-H), 8.13 (d, 2H, Ph-H). 13 C NMR (100 MHz, DMSO): δ , , , (Aromatic carbons), (C-5), (C-2). GC/MS: m/z (%), 206 (M +, 100), 163 (93), 133 (13), 104 (23), 90 (17), 76 (25), 50 (14). S4
5 2-Amino-5-(o-methylphenyl)-1,3,4-oxadiazole (2f) S2 Compound 2f, Yield: 86 %, white solid; IR: (KBr, cm -1 ) 1042, 1279, 1481, 1593, 1658, 2964, 3108, 3283; 1 H NMR (400 MHz, DMSO): δ 2.32 (s, 3H, Ph-CH 3 ), 6.73 (bs, 2H, NH 2 ), (m, 4H, Ph-H). 13 C NMR (100 MHz, DMSO): δ (CH 3 ) , , , , , (Aromatic carbons), (C-5), (C-2). 2-Amino-5-(o-chlorophenyl)-1,3,4-oxadiazole (2g) S3 Compound 2g, Yield: 87 %, white solid; IR: (KBr, cm -1 ) 1051, 1283, 1478, 1596, 1641, 3082, 3267; 1 H NMR (400 MHz, DMSO): δ 6.89 (bs, 2H, NH 2 ), (m, 4H, Ph-H), 13 C NMR (100 MHz, DMSO): δ , , , , , (Aromatic carbons), (C-5), (C-2). GC/MS: m/z (%), 195 (M +, 52), 151 (60), 138 (52), 111 (51), 75 (100), 51 (16). S5
6 2-Amino-5-(o-methoxyphenyl)-1,3,4-oxadiazole (2h) S4 Compound 2h, Yield: 84 %, white solid; m.p C. IR: (KBr, cm -1 ) 1048, 1291, 1461, 1581, 1648, 3091, 3257; 1 H NMR (400 MHz, DMSO): δ 3.86 (s, 3H, OCH 3 ), 6.72 (bs, 2H, NH 2 ), (m, 4H, Ph-H). 13 C NMR (100 MHz, DMSO): δ (OCH 3 ), , , , , , (Aromatic carbons), (C-2), (C-2). 2-Amino-5-(o-nitrophenyl)-1,3,4-oxadiazole (2i) S5 Compound 2i, Yield: 83 %, red solid; IR: (KBr, cm -1 ) 1046, 1270, 1348, 1469, 1532, 1591, 1642, 3123, 3281; 1 H NMR (400 MHz, DMSO): δ 6.94 (bs, 2H, NH 2 ), (m, 4H, Ph-H). 13 C NMR (100 MHz, DMSO): δ , , , , , (Aromatic carbons), (C-5), (C-2). S6
7 2-Amino-5-methyl-1,3,4-oxadiazole (2j) S6 Compound 2j, Yield: 79 %, white solid; m.p C (lit. S6 m.p C). IR: (KBr, cm - 1 ) 1041, 1289, 1468, 1581, 1657, 2984, 3257; 1 H NMR (400 MHz, DMSO): δ 2.15 (s, 3H, CH 3 ) (bs, 2H, NH 2 ) 13 C NMR (100 MHz, DMSO): δ (CH 3 ), (C-5), (C-2). 2-Amino-5-propyl-1,3,4-oxadiazole (2k) S7 Compound 2k, Yield: 81 %, white solid; IR: (KBr, cm -1 ) 1091, 1267, 1360, 1461, 1588, 1644, 2949, 3266; 1 H NMR (400 MHz, DMSO): δ 0.82 (t, 3H, CH 3 ), (q, 2H, CH 2 ) 2.42 (t, 2H, CH 2 ), 6.56 (bs, 2H, NH 2 ). 13 C NMR (100 MHz, DMSO): δ (CH 3 ), (CH 2 ), (CH 2 ), (C-5), (C-2). 2-Amino-5-(pyridin-4-yl)-1,3,4-oxadiazole (2l) S5 S7
8 Compound 2l, Yield: 86 %, yellow solid; IR: (KBr, cm -1 ) 1037, 1298, 1425, 1590, 1665, 3040, 3284; 1 H NMR (400 MHz, DMSO): δ 7.41 (bs, 2H, NH 2 ), 7.67 (d, 2H, Py-H), 8.69 (s, 2H, Py- H). 13 C NMR (100 MHz, DMSO): δ , , (Pyridine carbons), (C-5), (C-2). 2-Amino-5-(thiophen-2-yl)- 1,3,4-oxadiazole (2m) S8 Compound 2m, Yield: 88 %, pale yellow solid; IR: (KBr, cm -1 ) 1053, 1251, 1442, 1582, , 3290; 1 H NMR (400 MHz, DMSO): δ 7.09 (bs, 2H, NH 2 ), 7.10 (t, 1H, Th-H), 7.45 (d, 1H, Th-H), 7.55 (d, 1H, Th-H). 13 C NMR (100 MHz, DMSO): δ , , , (Thiophene carbons), (C-5), (C-2). GC/MS: m/z (%), 167 (M +, 100), 124 (57), 111 (34), 97 (26), 69 (17), 57 (5). References S1. C. Gautam and S. R. Partha, Synth. Commun. 2011, 41, S2. K. Sanjeev, Turk. J. Chem., 2011, 35, 99. S3. M. Mitsuhiko, S. Takuji, M. Toshimi and I. Kin-Ichi, Chem. Pharm. Bull., 1976, 24(11), S4. H. Gehlen and K. Moeckel, Justus Liebigs Annalen der Chemie, 1962, 660, 144. S5. (a) S. Kumar and D. P. Srivastava, Indian J. Pharm. Sci., 2010, 72(4), 458; (b) S. Laxmi Kath, S. Susma and R. K. P. Singh, Indian J. Chem., 2011, 50B, 110. S6. A. A. Hassan, E. M. Aboul-Fetouh and H. A. Ashraf, ARKIVOC, 2007, (i), 222. S7. S.Kumar, J. Korean Chem. Soc., 2009, 53(2), 159. S8. G. D. Fallon, C. L. Francis, K. Johansson, A. J. Liepa and R. C. J. Woodgate, Australian J. Chem., 2005, 58(12), 891. S8
9 Spectra of Compound 2a-m GC / MS of 2a S9
10 IR of 2a S10
11 1 H NMR of 2a S11
12 13 C NMR of 2a S12
13 GC / MS of 2b S13
14 1 H NMR of 2b S14
15 13 C NMR of 2b S15
16 GC / MS of 2c S16
17 1 H NMR of 2c S17
18 13 C NMR of 2c S18
19 GC/MS of 2d S19
20 1 H NMR of 2d S20
21 13 C NMR of 2d S21
22 GC-MS of 2e S22
23 1 H NMR of 2e S23
24 13 C NMR of 2e S24
25 GC-MS of 2g S25
26 1 H NMR of 2g S26
27 13 C NMR of 2g S27
28 1 H NMR of 2j S28
29 13 C NMR of 2j S29
30 IR of 2l S30
31 1 H NMR of 2l S31
32 13 C NMR of 2l S32
33 GC-MS of 2m S33
34 1 H NMR of 2m S34
35 13 C NMR of 2m S35
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