Table 1.
1H NMR spectroscopic data of silvaticusins A–C (1–3) (δ in ppm, J in Hz)
| No | 1a | 2a | 3b |
|---|---|---|---|
| 1a | 0.89, m | 0.82, m | 1.93, overlap |
| 1b | 1.27, m | 1.15 d, (13.5) | 1.65, overlap |
| 2a | 1.08, m | 1.26, m | 1.92, overlap |
| 2b | 1.31, m | 1.26, m | 1.92, overlap |
| 3a | 1.23, m | 1.09, m | 4.04, m |
| 3b | 1.23, m | 1.34, m | – |
| 5 | 1.56, d, (5.3) | 1.41, dd, (11.7, 6.9) | 1.59, br d, (12.4) |
| 6a | 4.21, d, (5.3) | 2.04, m | 2.16, q, (12.4) |
| 6b | – | 3.57, m | 1.74, m |
| 7 | – | – | 4.80, dt, (12.4, 4.7) |
| 9 | 2.53, dd, (15.3, 6.3) | 1.56, m | 1.42, overlap |
| 11a | 1.79, m | 1.99, m | 1.43, overlap |
| 11b | 1.95, m | 1.99, m | 1.52, m |
| 12a | 4.32, t, (8.2) | 4.26, t, (8.2) | 1.66, overlap |
| 12b | – | – | 0.83, m |
| 13 | 3.18, br s | 3.52, br s | 3.23, br s |
| 14 | 5.34, br s | 5.59, br s | 5.09, br s |
| 15 | 5.72, br s | – | – |
| 17a | 5.36, d, (1.9) | 5.49, s | 6.30, s |
| 17b | 5.74, d, (1.9) | 6.38, s | 5.39, s |
| 18 | 1.15, s | 1.04, s | 9.5, s |
| 19 | 1.05, s | 0.77, s | 1.39, s |
| 20a | 4.07, d, (9.6) | 4.09, d, (10.0) | 1.07, s |
| 20b | 4.12, d, (9.6) | 4.31, d, (10.0) | – |
aRecorded on a 500 MHz NMR spectrometer in pyridine-d5. bRecorded on an 800 MHz NMR spectrometer in pyridine-d5