Table 1.
Comparison of NMR data of aureothin (1) and aureopyran (6)
| Position | Aureopyran (6) | Aureothin (1) | ||
|---|---|---|---|---|
|
| ||||
| 1H (mult, J Hz) | 13C (mult) | 1H (mult, J Hz) | 13C (mult) | |
| 2 | 164.5 (s) | 162.0 (s) | ||
| 2a | – | 3.97 (s) | 55.2 (q) | |
| 3 | 112.5 (s) | 99.9 (s) | ||
| 3a | 2.06 (s) | 10.5 (q) | 1.90 (s) | 6.8 (q) |
| 4 | 168.3 (s) | 180.5 (s) | ||
| 4a | 3.78 (s) | 60.4 (q) | – | |
| 5 | 112.2 (s) | 120.1 (s) | ||
| 5a | 2.03 (s) | 10.6 (q) | 2.04 (s) | 9.4 (q) |
| 6 | 148.4 (s) | 154.6 (s) | ||
| 7 | 145.3 (s) | 5.17 (t 6.5) | 73.2 (d) | |
| 8 | 6.00 (s) | 107.5 (d) | 3.05 (m) | 38.2 (t) |
| 9 | 130.2 (s) | 140.5 (s) | ||
| 9a | 1.78 (d 1.5) | 20.2 (q) | 4.89 (d 14.2) 4.77 (d 14.2) |
70.0 (t) |
| 10 | 4.97 (t 1.5) | 120.1 (d) | 6.22 (s) | 128.3 (d) |
| 11 | 79.9 (s) | 138.5 (s) | ||
| 11a | 1.37 (s) | 25.4 (q) | 2.08 (s) | 17.6 (q) |
| 12 | 3.10 (d 13.4) 3.03 (d 13.4) |
45.2 (t) | 6.42 (s) | 125.9 (d) |
| 13 | 144.4 (s) | 144.1 (s) | ||
| 14, 18 | 7.32 (d 8.8) | 131.5 (d) | 7.43 (d 8.5) | 129.5 (d) |
| 15, 17 | 8.11 (d 8.8) | 123.0 (d) | 8.20 (d 8.5) | 123.5 (d) |
| 16 | 146.7 (s) | 146.0 (s) | ||