Solvent-Free Friedel-Crafts Acylation: General Procedure
A mixture of harmine (
1, 100 mg), acylating agents (3.5 mL) and anhydrous AlCl
3 (400 mg) was thoroughly ground in an agate mortar with a pestle for 50 min in a fume cupboard. The reaction mixture was then kept at room temperature for 1 hour and poured into crushed ice, made basic with 30% aqueous NH
4OH and extracted with ethyl acetate. The ethyl acetate layer gave a solid mass after washing, drying (Na
2SO
4) and removal of solvents under reduced pressure. Further workup using column chromatography (silica gel; Merck 9385; CHCl
3-MeOH, in increasing order of polarity from 9.95:0.05 to 9.5:0.5) afforded 10,12-diacyl,11-hydroxy (
23-30; TLC data: R
f ~ 0.90, 9.5:0.5 CHCl
3-MeOH), 12-acyl (
10-17; TLC data: R
f ~ 0.86, 9.5:0.5 CHCl
3-MeOH), 10-acyl,11-hydroxy (
18-22; TLC data: R
f ~ 0.70, 9.5:0.5 CHCl
3-MeOH ) and 10-acyl (
2-9; TLC data: R
f ~ 0.61, 9.5:0.5 CHCl
3-MeOH) derivatives, respectively, as colorless crystalline solids, in moderate yields (
Table 1).
10-Acetyl-11-methoxy-3-methyl-β-carboline (2). 17.3 mg; mp: 265-266 oC; IR (CHCl3) νmax cm-1: 3263.2 (indole N-H) 2962.6, 2847.8 (C-H), 1656.4 (ketone C=O), 1606.1, 1524.2, 1457.0 (aromatic C=C), 1162.3 (C-O); UV (MeOH) λmax nm: 330.1, 270.1, 229.7; 1H-NMR (CD3OD): δ 8.18 (1H, d, J = 5.7 Hz, H-5), 8.05 (1H, d, J = 5.7 Hz, H-6), 8.46 (1H, s, H-9), 7.14 (1H, s, H-12), 2.86 (3H, s, H-14), 2.98 (3H, s, H-2′), 4.01 (3H, s, OCH3); 13C-NMR (CD3OD): δ 136.5 (C-2), 142.1 (C-3), 139.3 (C-5), 113.2 (C-6), 116.0 (C-7), 130.8 (C-8), 125.9 (C-9), 123.9 (C-10), 161.6 (C-11), 94.5 (C-12), 146.6 (C-13), 19.6 (C-14), 204.6 (C-1′), 32.4 (C-2′), 56.8 (OCH3); HREIMS (m/z): 254.1048 [C15H14N2O2 calcd. 254.1055]; EIMS m/z (%): 254 [M+] (100), 239 (94), 224 (36), 211 (4), 196 (28).
10-Propionyl-11-methoxy-3-methyl-β-carboline (
3). 39.2 mg; mp: 268-269
oC; IR (CHCl
3) ν
max cm
-1: 3264.2 (indole N-H), 2963.2, 2848.6 (C-H), 1656.1 (ketone C=O), 1604.1, 1525.1, 1453.2 (aromatic C=C), 1166.3 (C-O); UV (MeOH) λ
max nm: 329.6, 269.4, 230.2;
1H-NMR (CD
3OD):
Table 2;
13C-NMR (CD
3OD):
Table 3; HREIMS (
m/z): 268.1202 [C
16H
16N
2O
2 calcd. 268.1212]; EIMS
m/z (%): 268 [M
+] (60), 253 (10), 239 (100), 224 (40), 211 (3), 196 (32).
10-Butyryl-11-methoxy-3-methyl-β-carboline (4). 42.7 mg; mp: 269-270 oC; IR (CHCl3) νmax cm-1: 3268.2 (indole N-H), 2927.1, 2854.2 (C-H), 1657.1 (ketone C=O), 1608.3, 1523.9, 1412.5 (aromatic C=C), 1152.1 (C-O); UV (MeOH) λmax nm: 329.8, 269.8, 229.5; 1H-NMR (CD3OD): δ 8.18 (1H, d, J = 5.4 Hz, H-5), 8.04 (1H, d, J = 5.4 Hz, H-6), 8.48 (1H, s, H-9), 7.15 (1H, s, H-12), 2.88 (3H, s, H-14), 3.03 (2H, t, J = 7.3 Hz, H-2′), 1.72 (2H, sextet, J = 7.3 Hz, H-3′), 0.99 (3H, t, J = 7.3 Hz, H-4′), 4.03 (3H, s, OCH3); 13C-NMR (CD3OD): δ 136.3 (C-2), 142.5 (C-3), 139.7 (C-5), 113.6 (C-6), 116.1 (C-7), 130.9 (C-8), 125.7 (C-9), 123.8 (C-10), 161.5 (C-11), 94.6 (C-12), 146.4 (C-13), 19.0 (C-14), 204.3 (C-1′), 46.0 (C-2′), 18.6 (C-3′), 14.2 (C-4′), 56.8 (OCH3); HREIMS (m/z): 282.1360 [C17H18N2O2 calcd. 282.1368]; EIMS m/z (%): 282 [M+] (30), 267 (6), 239 (100), 224 (10), 211 (2), 196 (28).
10-Isobutyryl-11-methoxy-3-methyl-β-carboline (5). 27.5 mg; mp: 273-274 oC; IR (CHCl3) νmax cm-1: 3252.2 (indole N-H), 2947.0, 2853.1 (C-H), 1656.2 (ketone C=O), 1607.5, 1524.7, 1456.5 (aromatic C=C), 1152.2 (C-O); UV (MeOH) λmax nm: 330.0, 269.7, 229.5; 1H-NMR (CD3OD): δ 8.20 (1H, d, J = 5.5 Hz, H-5), 8.04 (1H, d, J = 5.5 Hz, H-6), 8.47 (1H, s, H-9), 7.14 (1H, s, H-12), 2.86 (3H, s, H-14), 3.60 (1H, septet, J = 6.8 Hz, H-2′), 1.13 (6H, d, J = 6.8 Hz, H-3′ and H-4′), 4.02 (3H, s, OCH3); 13C-NMR (CD3OD): δ 136.4 (C-2), 142.2 (C-3), 139.2 (C-5), 113.5 (C-6), 116.3 (C-7), 130.5 (C-8), 125.8 (C-9), 124.1 (C-10), 161.4 (C-11), 94.5 (C-12), 146.4 (C-13), 19.2 (C-14), 208.4 (C-1′), 40.1 (C-2′), 18.8 (C-3′ and C-4′), 56.5 (OCH3); HREIMS (m/z): 282.1357 [C17H18N2O2 calcd. 282.1368]; EIMS m/z (%): 282 [M+] (92), 239 (100), 224 (6), 211 (8), 196 (21).
10-Valeryl-11-hydroxy-3-methyl-β-carboline (6). 26.3 mg; mp: 272-273 oC; IR (CHCl3) νmax cm-1: 3252.6 (indole N-H), 2928.0, 2860.2 (C-H), 1655.8 (ketone C=O), 1601.6, 1525.4, 1423.1 (aromatic C=C), 1152.8 (C-O); UV (MeOH) λmax nm: 330.2, 269.8, 229.6; 1H-NMR (CD3OD): δ 8.18 (1H, d, J = 5.8 Hz, H-5), 8.08 (1H, d, J = 5.8 Hz, H-6), 8.45 (1H, s, H-9), 7.12 (1H, s, H-12), 2.87 (3H, s, H-14), 3.02 (2H, t, J = 7.3 Hz, H-2′), 1.66 (2H, quintet, J = 7.3 Hz, H-3′), 1.40 (2H, sextet, J = 7.3 Hz, H-4′), 0.94 (3H, t, J = 7.3 Hz, H-5′), 4.03 (3H, s, OCH3); 13C-NMR (CD3OD): δ 136.5 (C-2), 142.6 (C-3), 139.0 (C-5), 113.8 (C-6), 116.0 (C-7), 130.7 (C-8), 126.5 (C-9), 124.2 (C-10), 161.5 (C-11), 94.7 (C-12), 146.7 (C-13), 19.4 (C-14), 204.5 (C-1′), 44.2 (C-2′), 28.1 (C-3′), 23.5 (C-4′), 14.3 (C-5′), 56.6 (OCH3); HREIMS (m/z): 296.1512 [C18H20N2O2 calcd. 296.1525]; EIMS m/z (%): 296 [M+] (12), 267 (2), 254 (14), 239 (100), 224 (8), 211 (3), 196 (7).
10-Hexanoyl-11-methoxy-3-methyl-β-carboline (7). 29.3 mg; mp: 274-275 oC; IR (CHCl3) νmax cm-1: 3251.8 (indole N-H), 2925.8, 2856.4 (C-H), 1655.2 (ketone C=O), 1602.3, 1523.3, 1458.1 (aromatic C=C), 1168.1 (C-O); UV (MeOH) λmax nm: 330.1, 269.8, 231.4; 1H-NMR (CD3OD): δ 8.19 (1H, d, J = 5.4 Hz, H-5), 8.03 (1H, d, J = 5.4 Hz, H-6), 8.45 (1H, s, H-9), 7.12 (1H, s, H-12), 2.85 (3H, s, H-14), 3.02 (2H, t, J = 7.4 Hz, H-2′), 1.68 (2H, quintet, J = 7.4 Hz, H-3′), 1.36 (4H, m, H-4′ and H-5′), 0.91 (3H, t, J = 7.4 Hz, H-6′), 4.01 (3H, s, OCH3); 13C-NMR (CD3OD): δ 137.1 (C-2), 142.7 (C-3), 139.1 (C-5), 113.7 (C-6), 116.2 (C-7), 130.6 (C-8), 125.8 (C-9), 124.0 (C-10), 161.6 (C-11), 94.5 (C-12), 146.5 (C-13), 19.6 (C-14), 204.8 (C-1′), 44.5 (C-2′), 25.7 (C-3′), 32.8 (C-4′), 23.6 (C-5′), 14.3 (C-6′), 56.3 (OCH3); HREIMS (m/z): 310.1670 [C19H22N2O2 calcd. 310.1681]; EIMS m/z (%) : 310 [M+] (8), 267 (4), 254 (18), 239 (100), 224 (8), 211 (2), 196 (7).
10-Heptanoyl-11-methoxy-3-methyl-β-carboline (8). 40.9 mg; mp: 277-278 oC; IR (CHCl3) νmax cm-1: 3255.6 (indole N-H), 2923.5, 2858.1 (C-H), 1656.8 (ketone C=O), 1608.2, 1526.1, 1453.1 (aromatic C=C), 1150.2 (C-O); UV (MeOH) λmax nm: 330.2, 269.3, 231.8; 1H-NMR (CD3OD): δ 8.21 (1H, d, J = 5.4 Hz, H-5), 8.05 (1H, d, J = 5.4 Hz, H-6), 8.47 (1H, s, H-9), 7.15 (1H, s, H-12), 2.87 (3H, s, H-14), 2.99 (2H, t, J = 7.2 Hz, H-2′), 1.66 (2H, m, H-3′), 1.32 (6H, m, H-4′, H-5′ and H-6′), 0.90 (3H, t, J = 7.2 Hz, H-7′), 3.99 (3H, s, OCH3); 13C-NMR (CD3OD): δ 136.9 (C-2), 142.5 (C-3), 139.3 (C-5), 113.5 (C-6), 116.3 (C-7), 130.6 (C-8), 126.0 (C-9), 124.3 (C-10), 162.0 (C-11), 94.7 (C-12), 146.7 (C-13), 19.7 (C-14), 204.1 (C-1′), 44.6 (C-2′), 24.2 (C-3′), 30.3 (C-4′), 32.2 (C-5′), 23.2 (C-6′), 14.6 (C-7′), 56.6 (OCH3); HREIMS (m/z): 324.1851 [C20H24N2O2 calcd. 324.1838]; EIMS m/z (%): 324 [M+] (14), 267 (5), 254 (22) 239 (100), 224 (8), 211 (3), 196 (9).
10-Capryloyl-11-methoxy-3-methyl-β-carboline (9). 49.6 mg; mp: 280-281 oC; IR (CHCl3) νmax cm-1: 3250.2 (indole N-H), 2925.8, 2856.4 (C-H), 1657.1 (ketone C=O), 1607.8, 1521.8, 1454.8 (aromatic C=C), 1152.4 (C-O); UV (MeOH) λmax nm: 330.8, 270.1, 232.2; 1H-NMR (CD3OD): δ 8.22 (1H, d, J = 5.6 Hz, H-5), 8.06 (1H, d, J = 5.6 Hz, H-6), 8.46 (1H, s, H-9), 7.13 (1H, s, H-12), 2.89 (3H, s, H-14), 3.04 (2H, t, J = 7.3 Hz, H-2′), 1.69 (2H, quintet, J = 7.3 Hz, H-3′), 1.35 (2H, quintet, J = 7.3 Hz, H-4′), 1.33 (6H, m, H-5′, H-6′ and H-7′), 0.88 (3H, t, J = 7.3 Hz, H-8′), 4.05 (3H, s, OCH3); 13C-NMR (CD3OD): δ 136.1 (C-2), 142.6 (C-3), 139.2 (C-5), 113.8 (C-6), 116.1 (C-7), 130.5 (C-8), 126.1 (C-9), 124.2 (C-10), 161.4 (C-11), 94.8 (C-12), 146.6 (C-13), 19.5 (C-14), 204.5 (C-1′), 43.9 (C-2′), 25.1 (C-3′)*, 29.8 (C-4′)**, 29.6 (C-5′)**, 31.9 (C-6′), 25.4 (C-7′)*, 14.5 (C-8′), 56.7 (OCH3) (*,** values may be interchanged); HREIMS (m/z): 338.1985 [C21H26N2O2 calcd. 338.1994]; EIMS m/z (%): 338 [M+] (6), 267 (5), 254 (21), 239 (100), 224 (10), 211 (8), 196 (6).
12-Acetyl-11-methoxy-3-methyl-β-carboline (10). 15.0 mg; mp: 283-284 oC; IR (CHCl3) νmax cm-1: 3388.7 (indole N-H), 2922, 2848.7 (C-H), 1648.2 (ketone C=O), 1608.3, 1545.7, 1427.2 (aromatic C=C), 1151.6 (C-O); UV (MeOH) λmax nm: 361.8, 321.3, 269.7, 232.5; 1H-NMR (CDCl3): δ 8.35 (1H, d, J = 5.3 Hz, H-5), 7.83 (1H, d, J = 5.3 Hz, H-6), 8.23 (1H, d, J = 8.6 Hz, H-9), 6.99 (1H, d, J = 8.6 Hz, H-10), 2.95 (3H, s, H-14), 2.78 (3H, s, H-2′), 4.09 (3H, s, OCH3), 11.17 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.2 (C-2), 137.9 (C-3), 131.2 (C-5), 113.9 (C-6), 115.9 (C-7), 131.8 (C-8), 129.4 (C-9), 107.7 (C-10), 163.8 (C-11), 109.7 (C-12), 145.0 (C-13), 16.2 (C-14), 203.2 (C-1′), 33.6 (C-2′), 56.6 (OCH3); HREIMS (m/z): 254.1042 [C15H14N2O2 calcd. 254.1055]; EIMS m/z (%): 254 [M+] (96), 239 (100), 224 (31), 211 (3), 196 (33).
12-Propionyl-11-methoxy-3-methyl-β-carboline (
11). 15.7 mg; mp: 284-285
oC; IR (CHCl
3) ν
max cm
-1: 3388.2 (indole N-H), 2934.1, 2841.2 (C-H), 1648.7 (ketone C=O), 1607.2, 1545.7, 1472.1 (aromatic C=C), 1152.4 (C-O); UV (MeOH) λ
max nm: 361.4, 321.6, 269.4, 232.5;
1H-NMR (CD
3OD):
Table 2;
13C-NMR (CD
3OD):
Table 3; HREIMS (
m/z): 268.1223 [C
16H
16N
2O
2 calcd. 268.1212]; EIMS
m/z (%): 268 [M
+] (46,), 253 (4), 239 (100), 224 (31), 211 (4), 196 (29).
12-Butyryl-11-methoxy-3-methyl-β-carboline (12). 10.5 mg; mp: 287-288 oC; IR (CHCl3) νmax cm-1: 3390.1 (indole N-H) 2956.7, 2871.8 (C-H), 1647.9 (ketone C=O), 1610.3, 1544.5, 1434.9 (aromatic C=C), 1152.4 (C-O); UV (MeOH) λmax nm: 361.2, 321.4, 269.8, 232.4 nm; 1H-NMR (CDCl3): δ 8.33 (1H, d, J = 5.4 Hz, H-5), 7.81 (1H, d, J = 5.4 Hz, H-6), 8.19 (1H, d, J = 8.7 Hz, H-9), 6.95 (1H, d, J = 8.7 Hz, H-10), 2.98 (3H, s, H-14), 3.14 (2H, t, J = 7.3 Hz, H-2′), 1.79 (2H, sextet, J = 7.3 Hz, H-3′), 1.03 (3H, t, J = 7.3 Hz, H-4′), 4.06 (3H, s, OCH3), 11.16 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.4 (C-2), 138.1 (C-3), 131.0 (C-5), 113.9 (C-6), 116.0 (C-7), 131.9 (C-8), 129.3 (C-9), 107.5 (C-10), 163.6 (C-11), 109.8 (C-12), 145.0 (C-13), 16.4 (C-14), 203.3 (C-1′), 45.3 (C-2′), 18.0 (C-3′), 14.2 (C-4′), 56.9 (OCH3); HREIMS (m/z): 282.1377 [C17H18N2O2 calcd. 282.1368]; EIMS m/z (%): 282 [M+] (32), 267 (8), 239 (100), 224 (17), 211 (3), 196 (28).
12-Isobutyryl-11-methoxy-3-methyl-β-carboline (13). 16.6 mg; mp: 290-291 oC; IR (CHCl3) νmax cm-1: 3384.1 (indole N-H), 2927.2, 2857.2 (C-H), 1648.9 (ketone C=O), 1614.2, 1544.7, 1460.6 (aromatic C=C), 1151.3 (C-O); UV (MeOH) λmax nm: 361.3, 321.4, 269.4, 232.2; 1H-NMR (CDCl3): δ 8.34 (1H, d, J = 5.5 Hz, H-5), 7.80 (1H, d, J = 5.5 Hz, H-6), 8.21 (1H, d, J = 8.7 Hz, H-9), 6.98 (1H, d, J = 8.7 Hz, H-10), 2.96 (3H, s, H-14), 3.88 (1H, septet, J = 6.7 Hz, H-2′), 1.23 (6H, d, J = 6.7 Hz, H-3′ and H-4′), 4.08 (3H, s, OCH3), 11.21 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.2 (C-2), 138.1 (C-3), 131.3 (C-5), 113.6 (C-6), 116.2 (C-7), 131.8 (C-8), 129.2 (C-9), 107.5 (C-10), 163.8 (C-11), 109.6 (C-12), 145.1 (C-13), 16.1 (C-14), 207.4 (C-1′), 40.7 (C-2′), 18.8 (C-3′and C-4′), 56.8 (OCH3); HREIMS (m/z): 282.1362 [C17H18N2O2 calcd. 282.1368]; EIMS m/z (%): 282 [M+] (94), 239 (100), 224 (8), 211 (6), 196 (17).
12-Valeryl-11-methoxy-3-methyl-β-carboline (14). 14.1 mg; mp: 289-290 oC; IR (CHCl3) νmax cm-1: 3385.1 (indole N-H), 2928.1, 2861.5 (C-H), 1648.8 (ketone C=O), 1612.5, 1543.9, 1416.2 (aromatic C=C), 1152.2 (C-O); UV (MeOH) λmax nm: 361.2, 321.8, 269.4, 232.6; 1H-NMR (CDCl3): δ 8.34 (1H, d, J = 5.3 Hz, H-5), 7.84 (1H, d, J = 5.3 Hz, H-6), 8.25 (1H, d, J = 8.7 Hz, H-9), 7.03 (1H, d, J = 8.7 Hz, H-10), 3.02 (3H, s, H-14), 3.16 (2H, t, J = 7.2 Hz, H-2′), 1.73 (2H, quintet, J = 7.2 Hz, H-3′), 1.45 (2H, sextet, J = 7.2 Hz, H-4′), 0.97 (3H, t, J = 7.2 Hz, H-5′), 4.10 (3H, s, OCH3), 11.26 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.2 (C-2), 138.4 (C-3), 131.4 (C-5), 113.8 (C-6), 116.0 (C-7), 132.1 (C-8), 129.4 (C-9), 107.6 (C-10), 163.9 (C-11), 110.1 (C-12), 144.9 (C-13), 16.2 (C-14), 203.2 (C-1′), 45.0 (C-2′), 26.5 (C-3′), 22.6 (C-4′), 14.0 (C-5′), 56.7 (OCH3); HREIMS (m/z): 296.1514 [C18H20N2O2 calcd. 296.1525]; EIMS m/z (%): 296 [M+] (86), 267 (39), 254 (52), 239 (100), 224 (19), 211 (2), 196 (10).
12-Hexanoyl-11-methoxy-3-methyl-β-carboline (15). 18.4 mg; mp: 292-293 oC; IR (CHCl3) νmax cm-1: 3385.0 (indole N-H), 2924.3, 2854.1 (C-H), 1648.8 (ketone C=O), 1614.5, 1546.4, 1460.0 (aromatic C=C), 1151.8 (C-O); UV (MeOH) λmax nm: 361.2, 321.5, 269.3, 232.8; 1H-NMR (CDCl3):δ 8.35 (1H, d, J = 5.4 Hz, H-5), 7.86 (1H, d, J = 5.4 Hz, H-6), 8.20 (1H, d, J = 8.6 Hz, H-9), 6.95 (1H, d, J = 8.6 Hz, H-10), 2.97 (3H, s, H-14), 3.15 (2H, t, J = 7.3 Hz, H-2′), 1.75 (2H, quintet, J = 7.3 Hz, H-3′), 1.40 (4H, m, H-4′ and H-5′), 0.94 (3H, t, J = 7.3 Hz, H-6′), 4.07 (3H, s, OCH3), 11.25 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.3 (C-2), 138.0 (C-3), 130.6 (C-5), 113.8 (C-6), 116.0 (C-7), 131.7 (C-8), 129.3 (C-9), 107.6 (C-10), 163.8 (C-11), 109.9 (C-12), 145.0 (C-13), 16.1 (C-14), 203.0 (C-1′), 44.2 (C-2′), 23.2 (C-3′), 31.1 (C-4′), 22.9 (C-5′), 14.2 (C-6′), 56.8 (OCH3); HREIMS (m/z): 310.1690 [C19H22N2O2 calcd. 310.1681]; EIMS m/z (%): 310 [M+] (26), 267 (6), 254 (11), 239 (100), 224 (12), 211 (6), 196 (8).
12-Heptanoyl-11-methoxy-3-methyl-β-carboline (16). 18.0 mg; mp: 296-297 oC; IR (CHCl3) νmax cm-1: 3384.5 (indole N-H), 2926.1, 2857.4 (C-H), 1648.2 (ketone C=O), 1608.2, 1542.9, 1455.2 (aromatic C=C), 1151.2 (C-O); UV (MeOH) λmax nm: 361.8, 321.2, 269.3, 232.1; 1H-NMR (CDCl3): δ 8.35 (1H, d, J = 4.7 Hz, H-5), 7.85 (1H, d, J = 4.7 Hz, H-6), 8.27 (1H, d, J = 8.7 Hz, H-9), 7.02 (1H, d, J = 8.7 Hz, H-10), 3.05 (3H, s, H-14), 3.15 (2H, t, J = 7.3 Hz, H-2′), 1.74 (2H, quintet, J = 7.3 Hz, H-3′), 1.40 (2H, quintet, J = 7.3 Hz, H-4′), 1.34 (4H, m, H-5′ and H-6′), 0.89 (3H, t, J = 7.3 Hz, H-7′), 4.11 (3H, s, OCH3), 11.17 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.2 (C-2), 137.9 (C-3), 131.0 (C-5), 114.0 (C-6), 115.7 (C-7), 131.8 (C-8), 129.4 (C-9), 107.5 (C-10), 163.8 (C-11), 110.0 (C-12), 145.1 (C-13), 16.0 (C-14), 203.4 (C-1′), 44.3 (C-2′), 24.1 (C-3′), 30.2 (C-4′), 32.2 (C-5′), 23.2 (C-6′), 14.4 (C-7′), 56.9 (OCH3); HREIMS (m/z): 324.1826 [C20H24N2O2 calcd. 324.1838]; EIMS m/z (%): 324 [M+] (84), 267 (53), 254 (66), 239 (100), 224 (12), 211 (7), 196 (8).
12-Capryloyl-11-methoxy-3-methyl-β-carboline (17). 18.3 mg; mp: 296-297 oC; IR (CHCl3) νmax cm-1: 3382.9 (indole N-H), 2923.9, 2854.5 (C-H), 1647.1 (ketone C=O), 1612.1, 1545.6, 1458.1 (aromatic C=C), 1153.2 (C-O); UV (MeOH) λmax nm: 361.2, 321.5, 269.3, 232.4; 1H-NMR (CDCl3): δ 8.35 (1H, d, J = 5.2 Hz, H-5), 7.83 (1H, d, J = 5.2 Hz, H-6), 8.25 (1H, d, J = 8.7 Hz, H-9), 7.01 (1H, d, J = 8.7 Hz, H-10), 3.02 (3H, s, H-14), 3.16 (2H, t, J = 7.3 Hz, H-2′), 1.74 (2H, quintet, J = 7.3 Hz, H-3′), 1.37 (2H, quintet, J = 7.3 Hz, H-4′), 1.30 (6H, m, H-5′, H-6′ and H-7′), 0.86 (3H, t, J = 7.1 Hz, H-8′), 4.12 (3H, s, OCH3), 11.23 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 134.2 (C-2), 137.7 (C-3), 130.4 (C-5), 114.0 (C-6), 115.7 (C-7), 132.3 (C-8), 129.5 (C-9), 107.8 (C-10), 163.9 (C-11), 110.2 (C-12), 145.1 (C-13), 15.7 (C-14), 203.1 (C-1′), 45.4 (C-2′), 24.3 (C-3′), 29.4 (C-4′)*, 29.3 (C-5′)*, 31.8 (C-6′), 22.6 (C-7′), 14.1 (C-8′), 56.9 (OCH3) (* values may be interchanged); HREIMS (m/z): 338.1988 [C21H26N2O2 calcd. 338.1994]; EIMS m/z (%): 338 [M+] (70), 267 (18), 254 (48), 239 (100), 224 (10), 211 (5), 196 (5).
10-Propionyl-11-hydroxy-3-methyl-β-carboline (
18). 28.5 mg; mp: 322-323
oC; IR (CHCl
3) ν
max cm
-1: 3378.2 (OH and indole N-H), 2932.3, 2845.2 (C-H), 1646.8 (ketone C=O), 1612.1, 1535.3, 1443.1 (aromatic C=C), 1153.4 (C-O); UV (MeOH) λ
max nm: 347.2, 340.4, 275.2, 236.3;
1H-NMR (CD
3OD):
Table 2;
13C-NMR (CD
3OD):
Table 3; HREIMS (
m/z): 254.1070 [C
15H
14N
2O
2 calcd. 254.1055]; EIMS
m/z (%): 254 [M
+] (79), 236 (9), 225 (100), 197 (6).
10-Butyryl-11-hydroxy-3-methyl-β-carboline (19). 8.8 mg; mp: 323-324 oC; IR (CHCl3) νmax cm-1: 3379.5 (OH and indole N-H), 2954.3, 2863.1 (C-H), 1646.6 (ketone C=O), 1608.7, 1536.5, 1432.1 (aromatic C=C), 1158.3 (C-O); UV (MeOH) λmax nm: 347.4, 340.2, 275.3, 236.5; 1H-NMR (CD3OD): δ 8.22 (1H, d, J = 5.6 Hz, H-5), 8.08 (1H, d, J = 5.6 Hz, H-6), 8.89 (1H, s, H-9), 6.94 (1H, s, H-12), 2.82 (3H, s, H-14), 3.20 (2H, t, J = 7.3 Hz, H-2′), 1.85 (2H, sextet, J = 7.4 Hz, H-3′), 1.08 (3H, t, J = 7.3 Hz, H-4′); 13C-NMR (CD3OD): δ 137.2 (C-2), 142.3 (C-3), 139.2 (C-5), 113.6 (C-6), 115.7 (C-7), 131.3 (C-8), 127.2 (C-9), 116.2 (C-10), 164.2 (C-11), 98.5 (C-12), 147.9 (C-13), 19.3 (C-14), 208.0 (C-1′), 38.2 (C-2′), 18.7 (C-3′), 14.3 (C-4′); HREIMS (m/z): 268.1220 [C16H16N2O2 calcd. 268.1212]; EIMS m/z (%): 268 [M+] (28), 253 (7), 240 (20), 225 (100), 197 (4).
10-Isobutyryl-11-hydroxy-3-methyl-β-carboline (20). 20.2 mg; mp: 326-327 oC; IR (CHCl3) νmax cm-1: 3378.2 (OH and indole N-H), 2925.1, 2854.9 (C-H), 1647.2 (ketone C=O), 1608.1, 1537.1, 1458.3 (aromatic C=C), 1158.2 (C-O); UV (MeOH) λmax nm: 347.5, 340.2, 275.1, 236.4; 1H-NMR (CD3OD): δ 8.18 (1H, d, J = 5.4 Hz, H-5), 7.97 (1H, d, J = 5.4 Hz, H-6), 8.83 (1H, s, H-9), 6.91 (1H, s, H-12), 2.77 (3H, s, H-14), 3.93 (1H, septet, J = 6.8 Hz, H-2′), 1.29 (6H, d, J = 6.8 Hz, H-3′ and H-4′); 13C-NMR (CD3OD): δ 137.4 (C-2), 141.8 (C-3), 138.7 (C-5), 114.2 (C-6), 115.0 (C-7), 131.6 (C-8), 127.4 (C-9), 116.2 (C-10), 165.4 (C-11), 98.9 (C-12), 148.3 (C-13), 18.8 (C-14), 212.0 (C-1′), 35.9 (C-2′), 20.1 (C-3′ and C-4′); HREIMS (m/z): 268.1218 [C16H16N2O2 calcd. 268.1212]; EIMS m/z (%): 268 [M+] (97), 253 (12), 225 (100), 197 (4).
10-Hexanoyl-11-hydroxy-3-methyl-β-carboline (21). 14.2 mg; mp: 327-328 oC; IR (CHCl3) νmax cm-1: 3373.2 (OH and indole N-H), 2923.9, 2854.5 (C-H), 1645.2 (ketone C=O), 1610.8, 1536.6, 1461.9 (aromatic C=C), 1199.6 (C-O); UV (MeOH) λmax nm: 347.6, 340.0, 275.0, 236.2; 1H-NMR (CD3OD): δ 8.20 (1H, d, J = 5.2 Hz, H-5), 8.00 (1H, d, J = 5.2 Hz, H-6), 8.83 (1H, s, H-9), 6.91 (1H, s, H-12), 2.78 (3H, s, H-14), 3.20 (2H, t, J = 7.3 Hz, H-2′), 1.80 (2H, quintet, J = 7.3 Hz, H-3′), 1.43 (4H, m, H-4′ and H-5′), 0.95 (3H, t, J = 7.3 Hz, H-6′); 13C-NMR (CD3OD): δ 137.4 (C-2), 142.5 (C-3), 139.5 (C-5), 113.8 (C-6), 115.7 (C-7), 131.2 (C-8), 127.3 (C-9), 116.4 (C-10), 164.6 (C-11), 98.5 (C-12), 147.9 (C-13), 19.5 (C-14), 208.1 (C-1′), 38.9 (C-2′), 25.8 (C-3′), 32.6 (C-4′), 23.6 (C-5′), 14.3 (C-6′); HREIMS (m/z): 296.1518 [C18H20N2O2 calcd. 296.1525]; EIMS m/z (%): 296 [M+] (34), 278 (10), 253 (17), 240 (25), 225 (100), 197 (6).
10-Heptanoyl-11-hydroxy-3-methyl-β-carboline (22). 8.6 mg; mp: 329-330 oC; IR (CHCl3) νmax cm-1: 3375.4 (OH and indole N-H), 2924.2, 2856.1 (C-H), 1646.4 (ketone C=O), 1608.7, 1536.2, 1422.7 (aromatic C=C), 1182.1 (C-O); UV (MeOH) λmax nm: 347.1, 339.9, 275.1, 236.3; 1H-NMR (CD3OD): δ 8.17 (1H, d, J = 5.7 Hz, H-5), 7.97 (1H, d, J = 5.7 Hz, H-6), 8.88 (1H, s, H-9), 6.92 (1H, s, H-12), 2.85 (3H, s, H-14), 3.07 (2H, t, J = 7.3 Hz, H-2′), 1.72 (2H, quintet, J = 7.3 Hz, H-3′), 1.37 (2H, quintet, J = 7.3 Hz, H-4′), 1.27 (4H, m, H-5′ and H-6′), 0.81 (3H, t, J = 7.3 Hz, H-7′); 13C-NMR (CD3OD): δ 137.5 (C-2), 142.3 (C-3), 139.5 (C-5), 113.7 (C-6), 115.8 (C-7), 131.1 (C-8), 127.2 (C-9), 116.3 (C-10), 164.3 (C-11), 98.4 (C-12), 147.6 (C-13), 19.4 (C-14), 207.9 (C-1′), 38.4 (C-2′), 24.4 (C-3′), 29.2 (C-4′), 31.9 (C-5′), 22.9 (C-6′), 14.7 (C-7′); HREIMS (m/z): 310.1673 [C19H22N2O2 calcd. 310.1681]; EIMS m/z (%): 310 [M+] (79), 292 (55), 253 (57), 240 (35), 225 (100), 197 (10).
10,12-Diacetyl-11-hydroxy-3-methyl-β-carboline (23). 17.0 mg; mp: 328-329 oC; IR (CHCl3) νmax cm‑1: 3384.2 (OH and indole N-H), 2928.0, 2850.1 (C-H), 1644.2 (ketone C=O), 1582.4, 1494.6, 1426.5 (aromatic C=C), 1189.7 (C-O); UV (MeOH) λmax nm: 364.5, 279.7, 230.2; 1H-NMR (CDCl3): δ 8.40 (1H, d, J = 5.3 Hz, H-5), 7.79 (1H, d, J = 5.3 Hz, H-6), 8.69 (1H, s, H-9), 2.88 (3H, s, H-14), 2.78 (3H, s, H-2′), 2.84 (3H, s, H-2′′), 14.67 (1H, s, OH), 11.33 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.1 (C-2), 140.9 (C-3), 137.9 (C-5), 112.9 (C-6), 114.5 (C-7), 130.2 (C-8), 130.5 (C-9), 114.6 (C-10), 166.9 (C-11), 109.0 (C-12), 146.6 (C-13), 18.5 (C-14), 206.6 (C-1′), 32.2 (C-2′), 203.3 (C-1′′), 36.9 (C-2′′); HREIMS (m/z): 282.1012 [C16H14N2O3 calcd. 282.1004]; EIMS m/z (%): 282 [M+] (91), 267 (100), 251 (18), 249 (32), 239 (4), 237 (18).
10,12-Dipropionyl-11-hydroxy-3-methyl-β-carboline (
24). 16.6 mg; mp: 330-331
oC; IR (CHCl
3) ν
max cm
-1: 3383.2 (OH and indole N-H), 2927.2, 2851.0 (C-H), 1646.1 (ketone C=O), 1580.4, 1493.8, 1461.3 (aromatic C=C), 1189.2 (C-O); UV (MeOH) λ
max nm: 366.2, 279.8, 230.2;
1H-NMR (CD
3OD):
Table 2;
13C-NMR (CD
3OD):
Table 3; HREIMS (
m/z): 310.1325 [C
18H
18N
2O
3 calcd. 310.1317]; EIMS
m/z (%): 310 [M
+] (100), 292 (12), 281 (98), 253 (5), 251 (19), 237 (24).
10,12-Dibutyryl-11-hydroxy-3-methyl-β-carboline (25). 15.5 mg; mp: 331-332 oC; IR (CHCl3) νmax cm-1: 3383.5 (OH and indole N-H), 2926.5, 2856.5 (C-H), 1646.2 (ketone C=O), 1580.2, 1494.3, 1416.2 (aromatic C=C), 1188.5 (C-O); UV (MeOH) λmax nm: 366.2, 279.7, 230.0; 1H-NMR (CDCl3): δ 8.41 (1H, d, J = 5.3 Hz, H-5), 7.82 (1H, d, J = 5.3 Hz, H-6), 8.69 (1H, s, H-9), 2.87 (3H, s, H-14), 3.14 (2H, t, J = 7.3 Hz, H-2′), 1.88 (2H, sextet, J = 7.3 Hz, H-3′), 1.08 (3H, t, H-4′), 3.24 (2H, t, J = 7.3 Hz, H-2′′), 1.79 (2H, sextet, J = 7.3 Hz, H-3′′), 1.04 (3H, t, J = 7.3 Hz, H-4′′), 14.74 (1H, s, OH), 11.28 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.2 (C-2), 141.2 (C-3), 137.7 (C-5), 112.8 (C-6), 114.6 (C-7)*, 130.6 (C-8 and C-9), 114.8 (C-10)*, 167.0 (C-11), 108.9 (C-12), 146.7 (C-13), 18.5 (C-14), 206.7 (C-1′), 40.3 (C-2′), 18.3 (C-3′), 14.0 (C-4′)**, 203.1 (C-1′′), 47.2 (C-2′′), 17.6 (C-3′′), 13.9 (C-4′′)** (*,** values may be interchanged); HREIMS (m/z): 338.1625 [C20H22N2O3 calcd. 338.1630]; EIMS m/z (%): 338 [M+] (63), 323 (10), 295 (100), 282 (30), 277 (24), 267 (16), 251 (16), 237 (22).
10,12-Diisobutyryl-11-hydroxy-3-methyl-β-carboline (26). 12.6 mg; mp: 333-334 oC; IR (CHCl3) νmax cm-1: 3385.1 (OH and indole N-H), 2926.0, 2854.0 (C-H), 1645.1 (ketone C=O), 1581.2, 1494.5, 1455.2 (aromatic C=C), 1187.2 (C-O); UV (MeOH) λmax nm: 365.8, 279.8, 230.1; 1H-NMR (CDCl3): δ 8.41 (1H, d, J = 5.3 Hz, H-5), 7.82 (1H, d, J = 5.3 Hz, H-6), 8.75 (1H, s, H-9), 2.88 (3H, s, H-14), 3.89 (1H, septet, J = 7.3 Hz, H-2′), 1.33 (6H, d, J = 7.3 Hz, H-3′ and H-4′), 3.98 (1H, septet, J = 7.3 Hz, H-2′′), 1.26 (6H, d, J = 7.3 Hz, H-3′′′and H-4′′), 14.71 (1H, s, OH), 11.41 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.1 (C-2), 141.1 (C-3), 137.8 (C-5), 112.9 (C-6), 114.4 (C-7), 130.2 (C-8), 130.7 (C-9), 114.5 (C-10), 166.9 (C-11), 108.8 (C-12), 146.5 (C-13), 18.6 (C-14), 211.8 (C-1′), 36.8 (C-2′), 19.3 (C-3′ and C-4′), 207.2 (C-1′′), 40.4 (C-2′′), 19.1 (C-3′′ and ′C-4′′); HREIMS (m/z): 338.1644 [C20H22N2O3 calcd. 338.1630]; EIMS m/z (%): 338 [M+] (36), 295 (100), 277 (45), 251 (22), 237 (26).
10,12-Divaleryl-11-hydroxy-3-methyl-β-carboline (27). 25.5 mg; mp: 332-333 oC; IR (CHCl3) νmax cm-1: 3383.0 (OH and indole N-H), 2927.4, 2862.8 (C-H), 1644.2 (ketone C=O), 1582.4, 1495.3, 1418.7 (aromatic C=C), 1199.8 (C-O); UV (MeOH) λmax nm: 364.8, 279.8, 230.0; 1H-NMR (CDCl3): δ 8.43 (1H, d, J = 5.3 Hz, H-5), 7.89 (1H, d, J = 5.3 Hz, H-6), 8.74 (1H, s, H-9), 2.93 (3H, s, H-14), 3.16 (2H, t, J = 7.3 Hz, H-2′), 1.80 (2H, quintet, J = 7.3 Hz, H-3′), 1.49 (2H, sextet, J = 7.3 Hz, H-4′), 0.99 (3H, t, J = 7.3 Hz, H-5′), 3.25 (2H, t, J = 7.3 Hz, H-2′′), 1.74 (2H, quintet, J = 7.3 Hz, H-3′′), 1.45 (2H, sextet, J = 7.3 Hz, H-4′′), 0.96 (3H, t, J = 7.3 Hz, H-5′′), 14.75 (1H, s, OH), 11.40 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.2 (C-2), 141.0 (C-3), 137.7 (C-5), 112.8 (C-6), 114.6 (C-7), 130.0 (C-8), 130.6 (C-9), 114.6 (C-10), 166.9 (C-11), 109.0 (C-12), 146.6 (C-13), 18.5 (C-14), 206.8 (C-1′), 38.1 (C-2′), 26.3 (C-3′), 22.5 (C-4′)*, 14.0 (C-4′)**, 203.3 (C-1′′), 44.9 (C-2′′), 26.9 (C-3′′), 22.4 (C-4′′)*, 13.9 (C-5′′)** (*,** values may be inter-changed); HREIMS (m/z): 366.1935 [C22H26N2O3 calcd. 366.1943]; EIMS m/z (%): 366 [M+] (20), 348 (24), 337 (77), 324 (25), 309 (100), 295 (22), 282 (16), 267 (20), 251 (18), 237 (25).
10,12-Dihexanoyl-11-hydroxy-3-methyl-β-carboline (28). 25.1 mg; mp: 335-336 oC; IR (CHCl3) νmax cm-1: 3384.2 (OH and indole N-H), 2924.6, 2855.2 (C-H), 1645.2 (ketone C=O), 1581.2, 1494.8, 1456.3 (aromatic C=C), 1189.2 (C-O); UV (MeOH) λmax nm: 364.9, 279.6, 230.2; 1H-NMR (CDCl3): δ 8.40 (1H, d, J = 5.2 Hz, H-5), 7.81 (1H, d, J = 5.2 Hz, H-6), 8.70 (1H, s, H-9), 2.89 (3H, s, H-14), 3.10 (2H, t, J = 7.3 Hz, H-2′), 1.81 (2H, quintet, J = 7.3 Hz, H-3′), 1.36 (8H, m, H-4′, H-5′, H-4′′′and H-5′′), 0.93 (3H, t, J = 6.8 Hz, H-6′), 3.21 (2H, t, J = 7.3 Hz, H-2′′), 1.74 (2H, quintet, J = 7.3 Hz, H-3′′), 0.91 (3H, t, J = 6.8 Hz, H-6′′), 14.69 (1H, s, OH), 11.31 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.0 (C-2), 141.1 (C-3), 137.9 (C-5), 112.8 (C-6), 114.5 (C-7), 130.0 (C-8), 130.6 (C-9), 114.7 (C-10), 167.0 (C-11), 108.9 (C-12), 146.4 (C-13), 18.4 (C-14), 206.6 (C-1′), 38.3 (C-2′), 25.7 (C-3′), 32.9 (C-4′)*, 23.8 (C-5′)**, 14.2 (C-6′)ψ, 203.5 (C-1′′), 45.1 (C-2′′), 25.5 (C-3′′), 32.8 (C-4′′)*, 23.7 (C-5′′)**, 14.1 (C-6′′)ψ (*,**,Ψ values may be inter-changed); HREIMS (m/z): 394.2244 [C24H30N2O3 calcd. 394.2256]; EIMS m/z (%): 394 [M+] (100), 376 (32), 351 (87), 338 (6), 323 (98), 295 (30), 282 (19), 267 (13), 251 (21), 237 (18).
10,12-Diheptanoyl-11-hydroxy-3-methyl-β-carboline (29). 27.1 mg; mp: 336-337 oC; IR (CHCl3) νmax cm-1: 3383.8 (OH and indole N-H), 2925.3, 2855.4 (C-H), 1644.2 (ketone C=O), 1580.0, 1495.5, 1450.1 (aromatic C=C), 1201.1 (C-O); UV (MeOH) λmax nm: 366.8, 284.6, 231.8; 1H-NMR (CDCl3): δ 8.43 (1H, d, J = 5.3 Hz, H-5), 7.85 (1H, d, J = 5.3 Hz, H-6), 8.72 (1H, s, H-9), 2.92 (3H, s, H-14), 3.15 (2H, t, J = 7.3 Hz, H-2′), 1.82 (2H, quintet, J = 7.3 Hz, H-3′), 1.45 (2H, m, H-4′), 1.34 (8H, m, H-5′, H-6′, H-5′′ and ′H-6′′), 0.90 (3H, t, J = 6.8 Hz, H-7′), 3.25 (2H, t, J = 7.3 Hz, H-2′′), 1.75 (2H, quintet, J = 7.3 Hz, H-3′′), 1.42 (2H, m, H-4′′), 0.89 (3H, t, J = 6.8 Hz, H-7′′), 14.75 (1H, s, OH), 11.38 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.1 (C-2), 140.9 (C-3), 137.9 (C-5), 112.7 (C-6), 114.5 (C-7)*, 129.9 (C-8), 130.5 (C-9), 114.6 (C-10)*, 166.9 (C-11), 108.7 (C-12), 146.5 (C-13), 18.4 (C-14), 206.8 (C-1′), 38.4 (C-2′), 24.1 (C-3′), 29.1 (C-4′)**, 31.8 (C-5′)ψ, 22.6 (C-6′)ψψ, 14.1 (C-7′)†, 203.3 (C-1′′), 45.3 (C-2′′), 24.7 (C-3′′), 28.9 (C-4′′)**, 31.6 (C-5′′)ψ, 22.5 (C-6′′)ψψ, 14.0 (C-7′′)† (*,**,Ψ,ΨΨ,† values may be interchanged); HREIMS (m/z): 422.2581 [C26H34N2O3 calcd. 422.2569]; EIMS m/z (%): 422 [M+] (100), 404 (25), 365 (57), 352 (24), 337 (94), 309 (2), 295 (25), 282 (27), 267 (37), 251 (24), 237 (28).
10,12-Dicapryloyl-11-hydroxy-3-methyl-β-carboline (30). 27.1 mg; mp: 339-340 oC; IR (CHCl3) νmax cm-1: 3381.0 (OH and indole N-H), 2925.8, 2858.3 (C-H), 1643.2 (ketone C=O), 1579.6, 1496.8, 1377.2 (aromatic C=C), 1202.8 (C-O); UV (MeOH) λmax nm: 365.9, 283.8, 231.6; 1H-NMR (CDCl3): δ 8.41 (1H, d, J = 5.4 Hz, H-5), 7.82 (1H, d, J = 5.4 Hz, H-6), 8.71 (1H, s, H-9), 2.91 (3H, s, H-14), 3.15 (2H, t, J = 7.3 Hz, H-2′), 1.80 (2H, quintet, J = 7.3 Hz, H-3′), 1.43 (2H, m, H-4′), 1.30 (12H, m, H-5′, H-6′, H-7′, H-5′′′′H-6′′ and H-7′′), 0.88 (3H, t, J = 6.8 Hz, H-8′), 3.25 (2H, t, J = 7.3 Hz, H-2′′), 1.76 (2H, quintet, J = 7.3 Hz, H-3′′), 1.41 (2H, m, H-4′′), 0.87 (3H, t, J = 6.8 Hz, H-8′′), 14.75 (1H, s, OH), 11.36 (1H, br.s, indole N-H); 13C-NMR (CDCl3): δ 135.0 (C-2), 141.0 (C-3), 137.8 (C-5), 112.9 (C-6), 114.2 (C-7), 131.0 (C-8), 131.1 (C-9), 115.0 (C-10), 167.3 (C-11), 108.9 (C-12), 146.5 (C-13), 18.3 (C-14), 206.9 (C-1′), 38.5 (C-2′), 24.8 (C-3′), 29.3 (C-4′)*, 29.2 (C-5′)*, 31.8 (C-6′)**, 22.6 (C-7′ and C-7′′), 14.1 (C-8′), 203.2 (C-1′′), 45.3 (C-2′′), 24.1 (C-3′′), 29.2 (C-4′′)*, 29.1 (C-5′′)*, 31.7 (C-6′′)**, 14.1 (C-8′′) (*,** values may be interchanged); HREIMS (m/z): 450.2898 [C28H38N2O3 calcd. 450.2882]; EIMS m/z (%): 450 [M+] (98), 432 (43), 403 (6), 379 (83), 366 (51), 351 (100), 323 (2), 295 (32), 282 (26), 267 (32), 251 (14), 237 (21).
Table 2.
1H-NMR data of 10-propionyl (3), 12-propionyl (11), 10-propionyl-11-hydroxy (18) and 10,12-dipropionyl-11-hydroxy (24) analogues of harmine (1).
Table 2.
1H-NMR data of 10-propionyl (3), 12-propionyl (11), 10-propionyl-11-hydroxy (18) and 10,12-dipropionyl-11-hydroxy (24) analogues of harmine (1).
H | 3 | 11 | 18 | 24 |
---|
5 | 8.21 (d, 5.7) | 8.35 (d, 5.5) | 8.15 (d, 5.3) | 8.42 (d, 5.3) |
6 | 8.06 (d, 5.7) | 7.82 (d, 5.5) | 7.94 (d, 5.3) | 7.87 (d, 5.3) |
9 | 8.50 (s) | 8.23 (d, 8.7) | 8.81 (s) | 8.72 (s) |
10 | - | 6.99 (d, 8.7) | - | - |
12 | 7.16 (s) | - | 6.91 (s) | - |
14 | 2.87 (s) | 2.97 (s) | 2.77 (s) | 2.94 (s) |
2′ | 3.06 (q, 7.3) | 3.19 (q, 7.1) | 3.20 (q,7.2) | 3.23 (q, 7.3) |
3′ | 1.18 (t, 7.3) | 1.24 (t, 7.1) | 1.25 (t, 7.2) | 1.34 (t, 7.3) |
OCH3 | 4.04 (s) | 4.08 (s) | - | - |
2′′ | - | - | - | 3.31 (q, 7.3) |
3′′ | - | - | - | 1.25 (t, 7.3) |
OH | - | - | Not observed | 14.69 (s) |
Indole N-H | Not observed | 11.20 (br.s) | Not observed | 11.40 (br.s) |
Table 3.
13C-NMR data of 10-propionyl (3), 12-propionyl (11), 10-propionyl-11-hydroxy (18) and 10,12-dipropionyl-11-hydroxy (24) analogues of harmine (1).
Table 3.
13C-NMR data of 10-propionyl (3), 12-propionyl (11), 10-propionyl-11-hydroxy (18) and 10,12-dipropionyl-11-hydroxy (24) analogues of harmine (1).
C | 3 | 11 | 18 | 24 |
---|
2 | 137.0 | 134.3 | 137.4 | 135.0 |
3 | 142.5 | 138.0 | 142.4 | 141.0 |
5 | 139.5 | 131.5 | 139.3 | 137.7 |
6 | 113.6 | 113.7 | 113.8 | 112.8 |
7 | 116.2 | 116.1 | 115.6 | 114.6 |
8 | 130.6 | 131.9 | 131.2 | 129.9 |
9 | 126.0 | 129.4 | 127.1 | 130.6 |
10 | 124.1 | 107.6 | 116.3 | 114.5 |
11 | 161.9 | 163.5 | 164.4 | 167.0 |
12 | 94.6 | 109.9 | 98.5 | 108.9 |
13 | 146.8 | 144.9 | 147.8 | 146.7 |
14 | 19.3 | 15.8 | 19.4 | 18.3 |
1′ | 204.2 | 203.4 | 208.2 | 206.7 |
2′ | 37.5 | 37.0 | 32.2 | 32.4 |
3′ | 9.4 | 9.2 | 8.9 | 9.2 |
OCH3 | 56.4 | 56.7 | - | - |
1′′ | - | - | - | 203.5 |
2′′ | - | - | - | 44.9 |
3′′ | - | - | - | 9.5 |