Table 1.
1H, 13C-NMR and HMBC of compound 1 a.
| Position | δC b | δH c | HMBC |
|---|---|---|---|
| 2 | 137.1 s | - | 11, 9 |
| 3 | 55.6 d | 4.08 brs | 19, 5a |
| 5a 5b |
52.7 t | 3.16 dd (9.0, 4.8) 2.92 brs |
|
| 7 | 107.5 s | - | 9, 5a |
| 8 | 128.3 s | - | 9, 10, 12 |
| 9 | 118.3 d | 7.38 d (7.8) | 11, 12 |
| 10 | 119.4 d | 6.96 ddd (7.8, 7.8, 1.2) | 12 |
| 11 | 121.4 d | 7.01 ddd (7.8, 7.8, 1.2) | 9 |
| 12 | 111.8 d | 7.30 d (7.8) | 10 |
| 13 | 137.3 s | - | 9, 11, Me |
| 14a 14b |
32.1 t | 2.14 m 2.10 m |
|
| 15 | 32.0 d | 1.66 m | |
| 16a 16b |
28.6 t | 1.70 ddd (16.8, 9.0, 4.2) 1.55 dd (9.0, 4.2) |
Me |
| 17a | 48.5 t | 2.77 m | |
| 17b | 2.68 m | ||
| 18a 18b |
116.8 t | 5.05 d (1.8) 5.04 d (1.8) |
|
| 19 | 140.5 d | 5.69 ddd (18.6, 12.0, 9.6) | 18a, 18b, 21a, 21b |
| 20 | 49.6 d | 2.28 brs | 18a, 18b, 19 |
| 21a 21b |
63.9 t | 3.66 dd (10.8, 6.0) 3.62 dd (10.8, 6.0) |
19 |
| N-CH3 | 49.6 s | 3.29 |
aAll assignments are based on 1D and 2D measurements (HMBC, HSQC, COESY). b Implied multiplicities were determined by DEPT (C = s, CH = d, CH2 = t). c J in Hz.