Table 1.
NMR data (CDCl3) for nothospondin (1)a
| No. | δ C | δH (J in Hz) | gHMBC |
|---|---|---|---|
| 1 | 209.1 | ||
| 2 | 76.9 | 4.71 d (8.7) | 1, 3, 19 |
| 3 | 83.7 | 2.93 dd (10.1, 8.7) | 2, 4, 18 |
| 4 | 34.7 | 1.96 m | 3, 5, 18 |
| 5 | 41.6 | 1.30 m | 19 |
| 6a | 25.7 | 1.82 ddd (14.8, 12.4, 2.1) | 5, 10 |
| 6b | 2.10 dt (14.8, 3.6) | 4, 5, 8, 10 | |
| 7 | 82.1 | 4.29 brt (2.9) | 5, 9 |
| 8 | 36.9 | ||
| 9 | 47.5 | 3.15 s | 1, 7, 8, 10, 11, 17, 18 |
| 10 | 48.1 | ||
| 11 | 190.8 | ||
| 12 | 148.4 | ||
| 13 | 140.5 | ||
| 14 | 47.3 | 2.42 dd (12.1, 7.0) | 8, 9, 12, 13, 17, 20 |
| 15a | 31.7 | 2.55 dd (18.6, 12.1) | 12, 13, 14 |
| 15b | 2.97 dd (18.6, 7.0) | 8, 9, 16 | |
| 16 | 169.0 | ||
| 17 | 23.2 | 1.20 s | 7, 8, 9, 14 |
| 18 | 14.9 | 1.04 d (6.5) | 3, 4, 5 |
| 19 | 15.6 | 1.46 s | 1, 5, 9, 10 |
| 20 | 16.0 | 1.89 s | 12, 13, 14 |
| OCH3 | 60.0 | 3.67 s | 12 |
a
Data were acquired with a Bruker Avance 111 600 MHz spectrometer; chemical shifts are in ppm and referenced to the residual solvent signal; J in Hz; HMBC correlations are from the proton(s) stated to the indicated carbon.