Table 2.
1H, 13C, 1H–1H COSY, and HMBC NMR data of 2.
| Position | δH (J in Hz) a | δC (Mult.) b | 1H–1H COSY | HMBC |
|---|---|---|---|---|
| 1 | 3.26 dd (3.0, 2.0) | 41.9 (CH) | H-2 | |
| 2 | 4.97 d (3.5) | 80.2 (CH) | H-1 | C-3, C-14 |
| 3 | 209.9 (C) | |||
| 4 | 2.66 m | 41.8 (CH) | H-5, H-18 | |
| 5 | 1.46 m; 1.95 m | 31.3 (CH2) | H-4, H-6 | |
| 6 | 1.83 m; 2.20 m | 26.0 (CH2) | H-5, H-7 | |
| 7 | 4.98 m | 125.7 (CH) | H-6 | C-9 |
| 8 | 135.2 (C) | |||
| 9 | 2.04 m; 2.18 m | 39.3 (CH2) | H-9, H-11 | |
| 10 | 2.13 m; 2.24 m | 24.4 (CH2) | H-11 | |
| 11 | 5.20 t (6.3) | 130.3 (CH) | H-10 | C-13 |
| 12 | 129.3 (C) | |||
| 13 | 2.31 d (13.0); 2.45 dd (15.0, 11.0) | 41.1 (CH2) | H-14 | C-1 |
| 14 | 5.09 dt (11.0, 2.5) | 75.6 (CH) | H-13 | |
| 15 | 135.1 (C) | |||
| 16 | 169.5 (C) | |||
| 17 | 5.73 d (2.5); 6.42 d (2.5) | 124.8 (CH2) | C-1, C-15, C-16 | |
| 18 | 1.14 d (7.0) | 17.7 (CH3) | C-3, C-4, C-5 | |
| 19 | 1.49 s | 15.0 (CH3) | C-7, C-8, C-9 | |
| 20 | 1.72 s | 16.1 (CH3) | C-11, C-12, C-13 | |
| 14-OAC | 2.02 s | 21.0 (CH3) | C-14-OAc | |
| 170.0 (C) |
Spectra recorded at a 500 and b 125 MHz in CDCl3.