Table 1.
13C NMR spectral data (assignment) of compounds 8, 12, 17 and 18a.
| 8 | 12 | 17 | 18 |
|---|---|---|---|
| 80.5 (C-3) | 80.9 (C-3) | 81.9 (C-3) | 81.6 (C-3) |
| 55.1 (C-5) | 55.1 (C-5) | 55.1 (C-5) | 55.1 (C-5) |
| 62.0 (C-9) | 62.0 (C-9) | 62.0 (C-9) | 62.0 (C-9) |
| 199.6 (C-11) | 199.6 (C-11) | 199.6 (C-11) | 199.6 (C-11) |
| 128.7 (C-12) | 128.7 (C-12) | 128.7 (C-12) | 128.7 (C-12) |
| 170.0 (C-13) | 170.0 (C-13) | 170.1 (C-13) | 170.2 (C-13) |
| 179.3 (C-30) | 179.3 (C-30) | 179.3 (C-30) | 179.5 (C-30) |
| 48.8 | 48.8 | 48.8 | 48.8 |
| 45.6 | 45.6 | 45.6 | 45.7 |
| 44.2 | 44.2 | 44.2 | 44.3 |
| 43.6 | 43.6 | 43.6 | 43.6 |
| 41.8 | 41.8 | 41.8 | 41.8 |
| 39.1 | 39.1 | 39.1 | 39.1 |
| 38.5 | 38.8 | 38.8 | 38.7 |
| 38.4 | 38.5 | 38.5 | 38.5 |
| 37.5 | 37.5 | 37.5 | 37.5 |
| 32.8 | 32.8 | 32.8 | 32.8 |
| 32.2 | 32.3 | 32.3 | 32.3 |
| 31.7 | 31.7 | 31.7 | 31.7 |
| 28.82 | 28.83 | 28.83 | 28.9 |
| 28.78 | 28.78 | 28.80 | 28.8 |
| 28.3 | 28.3 | 28.4 | 28.4 |
| 26.9 | 26.9 | 26.9 | 26.9 |
| 26.7 | 26.7 | 26.7 | 26.7 |
| 24.1 | 24.1 | 24.1 | 24.1 |
| 23.6 | 23.6 | 23.7 | 23.7 |
| 18.9 | 18.8 | 18.9 | 18.9 |
| 17.7 | 17.7 | 17.7 | 17.7 |
| 17.2 | 17.1 | 17.3 | 17.3 |
| 16.8 | 16.8 | 16.8 | 16.8 |
| C on C-3 side chain | |||
| 175.8 (C=O) | 174.0 (C=O) | 168.5 (C=O) | 166.2b (C=O) |
| 173.2 (C=O) | 171.5 (C=O) | 165.9 (C=O) | b |
| 34.7 (CH2CO) | 127.8 (CH=) | 134.5 (Ar-C) | 130.5c (Ar-C) |
| 34.6 (CH2CO) | 126.1 (CH=) | 133.6 (Ar-C) | c |
| 25.24 (CH2CH2CO) | 38.6 (=CHCH2) | 133.4 (Ar-C) | 129.7d (Ar-C) |
| 25.21 (CH2CH2CO) | 38.5 (=CHCH2) | 131.9 (Ar-C) | d |
| 131.3 (Ar-C) | |||
| 129.3 (Ar-C) |
a
Recorded in pyridine–d5 at 125 MHz.
b, c, d
Overlapping signals.