Table 1.
NMR data for compound 1 [in CDCl3, 500 (1H) and 125 (13C) MHz, chemical shifts in δ, coupling constants in Hz]
| Position | δC | δH, Mult.(J in Hz) | HMBC (H → C) |
|---|---|---|---|
| 1, 1′ | 167.3 | – | – |
| 3, 3′ | 77.0 | – | – |
| 4, 4′ | 161.5 | – | – |
| 5a, 5a′ | 82.1 | 5.7, s | 6a, 10a, 10b, 11a |
| 6a, 6a′ | 148.9 | – | – |
| 7, 7′ | 110.9 | 6.7, d (8.0) | 8, 9, 10a |
| 8, 8′ | 130.1 | 7.1, ddd (8.0, 7.6, 1.1) | 6a, 10 |
| 9, 9′ | 120.5 | 6.8, ddd (8.0, 7.6, 1.1) | 7, 8, 10a |
| 10, 10′ | 128.3 | 7.8, d (7.6) | 6a, 10a |
| 10a, 10a′ | 129.5 | – | – |
| 10b, 10b′ | 65.8 | – | – |
| 11, 11′ | 83.3 | 5.2, s | 5a, 10b |
| 11a, 11a′ | 77.5 | – | – |
| 12, 12′ | 28.1 | 3.0, s | 1, 3 |
| 13,13′ | 24.6 | a 2.4, b 2.1, dd (14.5,7.3) | 3, 4, 14 |
| 14,14′ | 9.9 | 1.2, d (7.3) | 3, 13 |
| OH-11, OH-11′ | 5.1, s | – | |
| NH-6, NH-6′ | 5.6, s | 5a |
Abbreviations: Mult., multiplicity.