Table 3. NMR Spectroscopic Data (500 MHz, CDCl3) of 9-Methoxycrotokilwaepoxide A (3).
| position | δC, type | δH (J in Hz) | HMBCa |
|---|---|---|---|
| 1 | 211.3, C | ||
| 2 | 36.9,CH | 2.57, ddq (8.4, 8.4, 7.1) | C-1, C-3, C-19 |
| 3 | 34.2, CH2 | 1.69 dd (13.9, 8.4) | C-2, C-4, C-5, C-19 |
| 2.90 dd (13.9, 8.4) | |||
| 4 | 61.4, C | ||
| 5 | 57.8, CH | 3.09 s | C-3, C-4, C-6, C-20 |
| 6 | 57.3, C | ||
| 7 | 38.0, CH | 3.02 d (12.8) | C-6, C-8, C-9, C-13, C-14, C-15 |
| 8 | 158.7, C | ||
| 9 | 109.8, C | ||
| OMe-9 | 52.0, CH3 | 3.55 s | C-9 |
| 10 | 30.5, CH2 | 1.75 ddd (15.0, 13.9, 4.0) | C-9, C-11, C-12 |
| 2.67 ddd (15.0, 3.9, 3.6) | C-8, C-9, C-11, C-12 | ||
| 11 | 32.9, CH2 | 1.49 ddd (13.8, 4.0, 3.6) | C-9, C-10, C-13, C-18 |
| 2.15 ddd (13.9, 13.8, 3.9) | C-9, C-10, C-12, C-13 | ||
| 12 | 58.4, C | ||
| 13 | 35.7, CH | 3.07 d (12.8) | C-7, C-8, C-11, C-12, C-14, C-18 |
| 14 | 64.3, C | ||
| 15 | 129.9, C | ||
| 16 | 170.8, C | ||
| 17 | 10.0, CH3 | 1.95 s | C-6, C-7, C-8, C-9, C-10, C-15, C-16 |
| 18 | 57.9, CH2 | 2.78 s | C-11, C-12, C-13 |
| 19 | 13.1, CH3 | 1.11 d (7.1) | C-1, C-2, C-3 |
| 20 | 20.5, CH3 | 1.15 s | C-6, C-7 |
a
HMBC correlations, optimized for 6 Hz, are from the stated proton(s) to the indicated carbon.