Table 1.
1H and 13C NMR data (500 and 125 MHz, CD3OD) of plakilactones G (1) and H (2).
| 1 | 2 | |||||
| position | δHa | δC | HMBC | δHa | δC | HMBC |
| 1 | – | 175.9 | – | 175.5 | ||
| 2 | – | 136.6 | – | 136.6 | ||
| 3 | 7.11 br t (1.5) | 153.5 | C1, C2, C4, C11 | 7.12 br t (1.2) | 153.0 | C1, C2, C4, C11 |
| 4 | – | 91.9 | – | 90.7 | ||
| 5 | 2.04 d (14.7) 1.64 dd (6.0, 14.7) |
36.6 | C3, C4, C6, C7, C13, C15 C3, C4, C6, C13, C15 |
1.95 dd (5.2, 14.7) 1.87 ovl |
40.0 | C3, C4, C6, C7, C13, C15 C3, C4, C6, C7, C13, C15 |
| 6 | 1.43 ovl | 37.4 | 0.91 ovl | 39.5 | C4, C7 | |
| 7 | 3.33b | 75.3 | C5, C8, C15 | 2.50 dd (2.0, 8.0) | 63.3 | C6, C9, C15 |
| 8 | 3.32b | 73.9 | C7 | 2.69 ddd (2.0, 5.6, 7.5) | 61.6 | C9 |
| 9 | 1.76 m 1.34 m |
27.4 | C10 C8, C10 |
1.54 m | 26.0 | C8, C10 |
| 10 | 1.00 t (7.4) | 10.1 | C8, C9 | 0.98 t (7.5) | 9.9 | C8, C9 |
| 11 | 2.28 q (7.5) | 19.2 | C1, C2, C3, C12 | 2.26 q (7.5) | 19.3 | C1, C2, C3, C12 |
| 12 | 1.17 t (7.5) | 12.1 | C2, C11 | 1.16 t (7.5) | 12.3 | C2, C11 |
| 13 | 1.85 m | 32.1 | C3, C4, C5, C14 | 1.86 ovl, 1.84 m | 31.8 | C5, C14 |
| 14 | 0.81 t (7.5) | 7.8 | C4, C13 | 0.81 t (7.3) | 7.8 | C4, C13 |
| 15 | 1.43 ovl | 26.2 | C6 | 1.44 m 1.39 m |
26.9 | C5, C6, C7, C16 C5, C6, C7, C16 |
| 16 | 0.85 t (6.8) | 11.6 | C6, C15 | 0.91 t (7.5) | 11.8 | C6, C15 |
aCoupling constants are in parentheses and given in Hertz. 1H and 13C assignments aided by COSY, HSQC and HMBC experiments. bOverlapped with solvent signal; ovl: overlapped with other signals.