SUPPLEMENTARY MATERIAL

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1 /CH16014_AC The Authors 2016 Australian Journal of Chemistry 2016, 69(9), SUPPLEMENTARY MATERIAL A Green Approach for the Synthesis of Novel 7,11-Dihydro-6H-chromeno[3,4- e]isoxazolo[5,4-b]pyridin-6-one Derivatives Using Acidic Ionic Liquid [C 4 mim][hso 4 ] Sudesh Kumari, Rajeswari M. and J. M. Khurana* Department of Chemistry, University of Delhi, Delhi * jmkhurana1@yahoo.co.in, jmkhurana@chemistry.du.ac.in NMR Interpretation The structures of all the novel compounds were identified by NMR ( 1 H and 13 C), IR and mass spectral analysis. NMR spectra of compound 4a showed one singlet at δ 1.88 for three protons of methyl and one singlet at δ 5.16 for one methine proton. The eight aromatic protons appeared in the range of δ and 1 N-H proton appeared as singlet at δ One methyl carbon in 13 C NMR appeared at δ 9.8 and one methine carbon appeared at δ The 15 aromatic carbons and 2 olefinic carbons appeared in the range of δ The carbonyl carbon appeared at δ IR spectra showed peaks at 3223 cm -1 (N-H stretch) and 1679 cm -1 (Carbonyl stretch). Mass spectrum of 4a showed a molecular ion peak at (m/z) (M+H) +. The position of peaks methyl, methylene, methine and quaternary carbons were assigned by DEPT spectra of compound 4a. Spectral data 7-(4-Chlorophenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4a) White solid; Obs. M.p.: o C; Yield: Method A = 92%, Method B = 94%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.18 (d, 1H, J = 7.63 Hz, Ar-H), (t, 1H, Ar-H), (t, 1H, Ar-H), 7.36 (d, 1H, J = 8.39 Hz, Ar-H) (m, 4H, Ar- H), 5.16 (s, 1H, -CH), 1.88 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.2, 159.2,

2 158.4, 152.2, 144.3, 143.2, 132.3, 131.2, 129.8, 128.2, 124.2, 123.1, 116.8, 113.3, 100.1, 94.8, 36.8, 9.8; IR (νmax, cm -1 ) (KBr): 3223, 1679, 1509, 1264; HRMS (ESI) m/z calcd. for C20H13ClN2O3: , HRMS (ESI) found: [M+H] +. 7-(4-Methoxyphenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4- b]pyridin-6-one (4b) White solid; Obs. M.p.: o C; Yield: Method A = 93%, Method B = 92%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.14 (d, 1H, J = 6.87 Hz, Ar-H), (t, 1H, Ar-H), (t, 1H, Ar-H), 7.32 (d, 1H, J = 7.63 Hz, Ar-H), 7.12 (d, 2H, J = 7.63 Hz, Ar-H), 6.78 (d, 2H, J = 7.63 Hz, Ar-H), 5.03 (s, 1H, -CH), 3.64 (s, 3H, -OCH3), 1.86 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.2, 159.0, 158.5, 157.9, 152.1, 142.7, 137.6, 132.2, 128.9, 124.2, 123.0, 116.8, 113.6, 113.4, 100.8, 95.3, 55.0, 36.4, 9.8; IR (νmax, cm -1 ) (KBr): 3233, 1680, 1517, 1258; HRMS (ESI) m/z calcd. for C21H16N2O4: , HRMS (ESI) found: [M+H] +. 8-Methyl-7-(4-nitrophenyl)-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin-6- one (4c) Pale yellow solid; Obs. M.p.: o C; Yield: Method A = 90%, Method B = 90%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), (m, 3H, Ar-H), (m, 3H, Ar-H), (m, 2H, Ar-H), 5.26 (s, 1H, -CH), 1.84 (s, 1H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.3, 158.4, 152.5, 152.3, 146.2, 143.7, 132.5, 129.3, 124.3, 123.6, 123.2, 116.8, 113.2, 99.4, 94.2, 37.5, 9.9; IR (νmax, cm -1 ) (KBr): 3190, 1678, 1509, 1262, 1070; HRMS (ESI) m/z calcd. for C20H13N3O5: , HRMS (ESI) found: [M+H] +. 7-(4-Bromophenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4d)

3 White solid; Obs. M.p.: o C; Yield: Method A = 92%, Method B = 94%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.18 (d, 1H, J = 7.63 Hz, Ar-H), (t, 1H, Ar-H), (t, 1H, Ar-H), 7.36 (d, 1H, J = 8.39 Hz, Ar-H) 7.30 (s, 4H, Ar-H), 5.15 (s, 1H, -CH), 1.88 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.2, 158.5, 152.2, 144.3, 143.2, 132.4, 131.2, 129.8, 128.2, 124.2, 123.1, 116.8, 113.3, 100.1, 94.8, 36.8, 9.8; IR (νmax, cm -1 ) (KBr): 3137, 1673, 1557, 1258; HRMS (ESI) m/z calcd. for C20H13BrN2O3: , HRMS (ESI) found: [M+H] +. 8-Methyl-7-(4-methylphenyl)--7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4e) White solid; Obs. M.p.: o C; Yield: Method A = 92%, Method B = 90%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.16 (d, 1H, J = 7.63 Hz, Ar-H ), (t, 1H, Ar-H), (t, 1H, Ar-H), 7.34 (d, 1H, J = 8.39 Hz, Ar-H), (q, 4H, Ar- H), 5.06 (s, 1H, -CH), 2.20 (s, 3H, -CH3), 1.87 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSOd6) δc: 160.2, 159.0, 158.4, 152.1, 142.9, 142.5, 135.7, 132.1, 128.8, 127.7, 124.1, 123.0, 116.7, 113.3, 100.6, 95.2, 36.9, 20.6, 9.8; IR (νmax, cm -1 ) (KBr): 3193, 1678, 1510, 1062; HRMS (ESI) m/z calcd. for C21H16N2O3: , HRMS (ESI) found: [M+H] +. 7-(4-Fluorophenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4f) White solid; Obs. M.p.: o C; Yield: Method A = 92%, Method B = 93%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.13 (d, 1H, J = 7.63 Hz, Ar-H ), (t, 1H, Ar-H), (t, 1H, Ar-H), (m, 3H, Ar-H), (t, 2H, Ar-H), 5.08 (s, 1H, -CH), 1.83 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.2, 159.1, 158.4, 152.2, 143.0, 141.6, 132.2, 129.8, 124.2, 123.1, 116.8, 114.9, 113.3, 100.3, 95.0, 36.6, 9.8 ; IR (νmax, cm -1 ) (KBr): 3153, 1681, 1510, 1385, 1225; HRMS (ESI) m/z calcd. for C20H13FN2O3: , HRMS (ESI) found: [M+H] +.

4 8-Methyl-7-(naphthalen-2-yl)-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4g) White solid; Obs. M.p.: o C; Yield: Method A = 90%, Method B = 92%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.22 (d, 1H, J = 7.63 Hz, Ar-H), (m, 4H, Ar-H), (t, 1H, Ar-H), (m, 5H, Ar-H), 5.31 (s, 1H, -CH), 1.87 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.2, 158.6, 152.3, 143.3, 142.8, 132.8, 132.3, 132.0, 128.0, 127.8, 127.5, 126.5, 126.2, 125.8, 124.3, 123.2, 116.8, 113.4, 100.4, 95.1, 37.6, 21.1, 9.9; IR (νmax, cm -1 ) (KBr): 3223, 1681, 1518, 1260; HRMS (ESI) m/z calcd. for C24H16N2O3: , HRMS (ESI) found: [M+H] +. 8-Methyl-7-(3-nitrophenyl)-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin-6- one (4h) Pale yellow solid; Obs. M.p.: o C; Yield: Method A = 93%, Method B = 91%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), (m, 2H, Ar-H), 7.91 (s, 1H, Ar-H), (m, 3H, Ar-H), (m, 2H, Ar-H), 5.67 (s, 1H, -CH), 2.05 (s, 1H, - CH3) ; 13 C NMR (100 MHz, DMSO-d6) δc: 167.1, 163.2, 162.3, 160.6, 152.2, 147.9, 142.5, 134.3, 132.5, 129.6, 124.2, 123.7, 121.7, 121.1, 116.5, 116.1, 105.9, 89.0, 33.6, 10.5; IR (νmax, cm -1 ) (KBr): 3412, 1649, 1519, 1352, 1212; HRMS (ESI) m/z calcd. for C20H13N3O5: , HRMS (ESI) found: [M+H] +. 8-methyl-7-phenyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin-6-one (4i) White solid; Obs. M.p.: o C; Yield: Method A = 90%, Method B = 93%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.16 (d, 1H, J = 8.39 Hz, Ar-H), (t, 1H, Ar-H), (t, 1H, Ar-H), 7.34 (d, 1H, J = 8.39 Hz, Ar-H), (m, 4H, Ar- H), (m, 1H, Ar-H), 5.12 (s, 1H,-CH), 1.87 (s, 3H, Ar-H); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.1, 158.5, 152.2, 145.4, 143.1, 132.3, 128.3, 127.9, 126.7, 124.2,

5 123.1, 116.8, 113.3, 100.5, 95.2, 37.3, 9.8; IR (νmax, cm -1 ) (KBr): 3201, 1680, 1510, 1262, 1061; HRMS (ESI) m/z calcd. for C20H14N2O3: , HRMS (ESI) found: [M+H] +. 7-(3-Chlorophenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4j) White solid; Obs. M.p.: o C; Yield: Method A = 92%, Method B = 90%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.14 (d, 1H, J = 7.63, Ar-H), (t, 1H, 7.18 (m, 2H, Ar-H), 5.12 (s, 1H, -CH), 1.85 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.3, 158.5, 152.2, 147.7, 143.5, 132.9, 132.4, 130.3, 127.7, 126.8, 124.3, 123.2, 116.9, 99.9, 94.7, 37.2, 9.9; IR (νmax, cm -1 ) (KBr): 3251, 1682, 1520, 1260, 1049; HRMS (ESI) m/z calcd. for C20H13ClN2O3: , HRMS (ESI) found: [M+H] +. Ar-H), (t, 1H, Ar-H), (m, 2H, Ar-H), 7.25 (d, 1H, J = 7.63, Ar-H), Methyl-7-(3,4,5-trimethoxyphenyl)-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4- b]pyridin-6-one (4k) White solid; Obs. M.p.: o C; Yield: Method A = 95%, Method B = 93%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, -NH), 8.14 (d, 1H, J = 6.87 Hz, Ar-H), 7.61 (s, 1H, Ar-H), (m, 2H, Ar-H), 6.49 (s, 2H, Ar-H), 5.10 (s, 1H, -CH), 3.63 (s, 6H, 2-OMe), 3.56 (s, 3H, -OMe), 1.95 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.2, 159.5, 158.3, 153.3, 152.2, 150.6, 148.2, 147.5, 143.9, 134.7, 132.2, 124.2, 122.9, 116.8, 115.9, 113.4, 112.6, 111.5, 99.9, 94.7, 56.2, 55.2, 31.9, 9.8; IR (νmax, cm -1 ) (KBr): 3227, 1681, 1519, 1126; HRMS (ESI) m/z calcd. for C23H20N2O6: , HRMS (ESI) found: [M+H] +. 7-(3-Bromophenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4l)

6 White solid; Obs. M.p.: o C; Yield: Method A = 94%, Method B = 92%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, -NH), 8.15 (d, J = 7.63 Hz, 1H, Ar-H), (t, 1H, Ar-H), (t, 1H, Ar-H), 7.33 (d, J = 8.39 Hz, 1H, Ar-H), 7.27 (s, 4H, Ar-H), 5.13 (s, 1H, -CH), 1.86 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.2, 158.4, 152.2, 147.9, 143.5, 132.2, 130.5, 129.6, 127.2, 125.4, 124.2, 123.2, 121.6, 116.8, 113.3, 99.8, 94.6, 37.1, 9.9; IR (νmax, cm -1 ) (KBr): 3252, 1681, 1519, 1048; HRMS (ESI) m/z calcd. for C20H13BrN2O3: , HRMS (ESI) found: [M+H] +. 7-(2,5-Dimethoxyphenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4- b]pyridin-6-one (4m) White solid; Obs. M.p.: o C; Yield: Method A = 93%, Method B = 95%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.15 (d, 1H, J = 7.63 Hz, Ar-H), (t, H), (m, 1H, Ar-H), 6.60 (s, 1H, Ar-H), 5.33 (s, 1H, -CH), 3.65 (s, 3H, -OMe), 3.56 (s, 3H, -OMe), 1.87 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.1, 159.4, 158.2, 153.2, 152.1, 150.6, 143.8, 134.6, 132.1, 124.1, 122.9, 116.7, 115.9, 113.3, 112.6, 111.5, 99.9, 94.7, 56.2, 55.2, 31.9, 9.7; IR (νmax, cm -1 ) (KBr): 3229, 1681, 1520, 1225, 1047; HRMS (ESI) m/z calcd. for C22H18ClN2O5: , HRMS (ESI) found: [M+H] +. 1H, Ar-H), (t, 1H, Ar-H), 7.34 (d, 1H, J = 7.63 Hz, Ar-H), (m, 1H, Ar- 8-Methyl-7-(4-(trifluoromethyl)phenyl)-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4- b]pyridin-6-one (4n) White solid; Obs. M.p.: o C; Yield: Method A = 92%, Method B = 92%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.16 (d, 1H, J = 7.63 Hz, Ar-H), (q, 5H, Ar-H), (t, 1H, Ar-H), 7.31 (d, 1H, J = 8.39 Hz, Ar-H), 5.21 (s, 1H, -CH), 1.84 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.2, 159.3, 158.4, 152.2, 149.7, 143.5, 132.4, 128.8, ( q for CF3), 125.2, 124.2, 123.1, 116.8, 113.2, 99.8, 94.5, 37.4, 9.8; IR (νmax, cm -1 ) (KBr): 3195, 1681, 1510, 1328, 1111; HRMS (ESI) m/z calcd. for C21H13F3N2O3: , HRMS (ESI) found: [M+H] +.

7 7-(2-Chlorophenyl)-8-methyl-7,11-dihydro-6H-chromeno[3,4-e]isoxazolo[5,4-b]pyridin- 6-one (4o) White solid; Obs. M.p.: o C; Yield: Method A = 90%, Method B = 92%; 1 H NMR (400 MHz, DMSO-d6) δh: (s, 1H, N-H), 8.19 (s, 1H, Ar-H), 7.65 (s, 1H, Ar-H), (m, 6H, Ar-H), 5.56 (s, 1H, -CH), 1.86 (s, 3H, -CH3); 13 C NMR (100 MHz, DMSO-d6) δc: 160.3, 159.4, 158.4, 152.5, 152.3, 146.3, 143.7, 132.5, 129.3, 124.3, 123.6, 123.2, 116.8, 113.2, 99.4, 94.2, 37.6, 37.5, 9.9; IR (νmax, cm -1 ) (KBr): 3240, 1682, 1510, 1262, 1061; HRMS (ESI) m/z calcd. for C20H13ClN2O3: , HRMS (ESI) found: [M+H] +.

8 1 H NMR of 4a

9 13 C NMR of 4a

10 DEPT-135 of 4a

11 1 H NMR of 4b

12 13 C NMR of 4b

13 1 H NMR of 4c

14 13 C NMR of 4c

15 1 H NMR of 4d

16 13 C NMR of 4d

17 1 H NMR of 4e

18 13 C NMR of 4e

19 1 H NMR of 4f

20 13 C NMR of 4f

21 19 F NMR of 4f

22 1 H NMR of 4g

23 13 C NMR of 4g

24 1 H NMR of 4h

25 13 C NMR of 4h

26 1 H NMR of 4i

27 13 C NMR of 4i

28 1 H NMR of 4j

29 13 C NMR of 4j

30 1 H NMR of 4k

31 13 C NMR of 4k

32 1 H NMR of 4l

33 13 C NMR of 4l

34 1 H NMR of 4m

35 13 C NMR of 4m

36 1 H NMR of 4n

37 13 C NMR of 4n

38 19 F NMR of 4n

39 1 H NMR of 4o

40 13 C NMR of 4o

41 Crystallographic study Figure S1: View of crystal packing of 4b shown along b axis according to symmetry equivalence Figure S2: View of crystal packing of 4b showing glide planes

42 Figure S3: View of crystal packing of 4b showing four Screw axes Figure S4: Intermolecular C-H..O, C-H..N and C-H..C interactions in the crystal packing of 4b

43 Figure S5: Intramolecular C-H..O and C-H..N interactions in the crystal structure of 4b

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