Table 1.
1H NMR and 13C NMR data of compounds 1–3 (δ in ppm, J in MHz)
| No. | 1 a | 2 b | 3 b | |||
|---|---|---|---|---|---|---|
| δ H | δ C | δ H | δ C | δ H | δ C | |
| 1 | – | 116.5 | – | 147.4 | – | 139.1 |
| 2 | 8.43 (d, 4.3) | 140.6 | 6.23 (br s) | 125.6 | 6.24 (brs) | 127.3 |
| 3 | 7.30 (d, 4.3) | 115.3 | 3.20 (br s) | 40.4 | 6.33 (brs) | 129.0 |
| 4 | – | 148.0 | – | 132.7 | – | 132.1 |
| 5 | 7.44 (d, 10.8) | 129.9 | 5.13 (td, 7.1, 1.5) | 115.8 | 5.50 (br t, 7.1) | 121.8 |
| 6 | 7.88 (dd, 10, 2.1) | 136.2 | 2.48 (m) | 28.5 | 2.46 (m) | 30.8 |
| 2.26 (ddd, 15.4, 7.1, 3.1) | ||||||
| 7 | – | 141.2 | – | 130.8 | 3.23 (m) | 44.8 |
| 8 | 10.00 (d, 2.1) | 136.8 | 6.49 (br s) | 117.4 | 6.77 (d, 4.5) | 143.0 |
| 9 | – | 140.2 | – | 141.8 | – | 142.4 |
| 10 | – | 143.3 | – | 145.7 | – | 135.2 |
| 11 | – | 146.9 | – | 141.7 | – | 146.4 |
| 12 | 5.46 (s) | 116.3 | 5.42 (s) | 114.0 | 4.81 (m) | 111.5 |
| 5.33 (s) | 5.08 (s) | 4.75 (m) | ||||
| 13 | 2.36 (s) | 23.3 | 1.96 (s) | 21.1 | 1.77 (s) | 20.9 |
| 14 | 2.96 (s) | 25.0 | 1.93 (s) | 20.5 | 1.88 (s) | 21.9 |
| 15 | – | 170.0c | 4.33 (br s) | 58.1 | 4.31 (br s) | 56.6 |
a In CDCl3
b In DMSO
c From HMBC data