Table 4.
1H NMR Data for Compounds 12–15 (600 MHz).
| Position | 12 a δH, m (J in Hz) | 13 b δH, m (J in Hz) | 14 b δH, m (J in Hz) | 15 a δH, m (J in Hz) |
|---|---|---|---|---|
| 2a | 6.79, br t (6.6) | 3.35, m | 3.75, dd (9.0, 6.0) | 3.79, dd (9.6, 5.4) |
| 2b | 3.27, dd (20.4, 7.8) | |||
| 3 | 3.34, m | |||
| 4a | 3.60, br s | 2.86, dd (17.4, 7.2) | 6.22. d (1.2) | 6.17, d (1.2) |
| 4b | 2.73, dd (17.4, 6.0) | 5.44, br s | 5.52, s | |
| 1-OCH3 | 3.64, s | 3.62, s | ||
| 5-OCH3 | 3.66, s | 3.68, s | ||
| 6-OCH3 | 3.71, s | 3.71, s | ||
| 7′a | 4.05, s | 3.65, dd (13.8, 6.0) | 3.69, dd (14.4, 5.4) | |
| 7′b | 3.54, dd (13.8, 9.0) | 3.56, dd (14.4, 9.6) |
a acetone-d6, b methanol-d4.