Table 1.
NMR spectroscopy data (MeOD-d4) for compound 1.
| Pos. | δH (mult., J = Hz) | δc | 1H-1H COSY | HMBC |
|---|---|---|---|---|
| 2 | 174.9s | |||
| 3 | 6.73 (s) | 111.6d | C-14, C-2, C-4, C-4a | |
| 4 | 182.1s | |||
| 4a | 120.6s | |||
| 5 | 138.0s | |||
| 6 | 7.47 (s) | 129.9d | C-13, C-12a, C-7, C-4a, C-6a | |
| 6a | 142.6s | |||
| 7 | 7.43 (s) | 117.4d | C-8, C-6, C-11a, C-6a, C-11 | |
| 7a | 147.8s | |||
| 8 | 4.95 (dd, 7.5, 3.8) | 69.0d | H-9 | C-10, C-7, C-7a |
| 9 | 2.18, 2.37 (m) | 32.7t | H-8, H-10 | C-10, C-8, C-7a, C-11 |
| 10 | 2.81, 3.00 (dq, 17.6, 4.6) | 36.8t | H-9 | C-9, C-8, C-11 |
| 11 | 207.0s | |||
| 11a | 113.3s | |||
| 12 | 165.8s | |||
| 12a | 114.7s | |||
| 12b | 159.1s | |||
| 13 | 4.16,4.26 (m) | 42.9t | C-13-COOH, C-5, C-4a, C-6 | |
| 13-COOH | 175.7s | |||
| 14 | 78.1s | |||
| 15 | 1.55 (s) | 24.0q | C-3, C-2, C-16 | |
| 16 | 5.28 (d, 10.5) | 71.5d | H-17 | C-3, C-2, C-15 |
| 17 | 5.73 (ddd, 11.7, 10.5, 1.5) | 130.0d | H-16, H-18 | C-19, C-16, C-14 |
| 18 | 5.88 (dq, 11.7, 6.8) | 130.1d | H-17, H-19 | C-19, C-16 |
| 19 | 1.92 (dd, 6.9, 1.8) | 14.4q | H-18 | C-17, C-16 |