Table 3.
1H NMR spectroscopic data of 2–4.
| Position | 2 α | 3 α | 4 b |
|---|---|---|---|
| 2 | 5.37, d (7.6) c | 5.67, d (10.0) | |
| 3 | 3.42, d (7.6) | 5.13, d (10.0) | 5.30, s |
| 5 | 1.68, m | 2.37, m | 1.96, m |
| 1.99, m | |||
| 6 | 1.98, m | 1.65, m | 2.10, m |
| 2.15, m | 1.94, m | ||
| 7 | 5.00, t (6.4) | 2.69, t (3.6) | 4.90, t (7.0) |
| 9 | 2.01, m | 1.01, t (12.8) | 1.97, m |
| 2.12, m | 2.12, dt (3.6, 12.8) | ||
| 10 | 2.12, m | 1.91, m | 2.12 m |
| 2.18, m | 2.27 m | 2.38 m | |
| 11 | 5.07, t (6.8) | 5.11, m | 4.92, t (7.0) |
| 13 | 2.20, m | 1.92, m | 2.31, m |
| 2.23, m | 2.00, m | ||
| 14 | 2.25, m | 1.72, m | 2.52 m |
| 2.50, m | 2.59, m | 2.57 m | |
| 16 | 1.37, s | 5.97, d (4.0) | |
| 17 | 1.37, s | 1.73, s | 1.94, s |
| 18 | 1.28, s | 1.85, s | 1.45, s |
| 19 | 1.57, s | 1.28, s | 1.57, s |
| 20 | 1.64, s | 1.60, s | 1.58, s |
| OOH | 8.47, brs |
α Spectroscopic data of 2 and 3 were recorded at 400 MHz in CDCl3. b Spectroscopic data of 4 were recorded at 500 MHz in CDCl3. c J values (in Hz) in parentheses.