Table 5. 1H NMR Data (500 MHz) for 12–14a.
| position | 12 | 13 | 14 |
|---|---|---|---|
| 1 | 1.32, d (6.2) | 1.32, d (6.3) | 1.32, d (6.9) |
| 2 | 5.21, m | 5.26, m | 5.41, m |
| 3 | 1.72, m | 1.83, m | 1.62, m |
| 1.90, m | 2.33, m | ||
| 4 | 1.38, m | 1.51, m | 1.48, m |
| 1.79, m | 1.96, m | 1.92, m | |
| 5 | 3.79, m | 3.81, m | 3.99, tdd |
| (10.3, 4.6, 2.3) | |||
| 6 | 1.55, m | 1.50, m | 1.30, m |
| 2.02, m | 1.89, m | ||
| 7 | 1.75, m | 1.65, m | 1.57, m |
| 1.91, m | 1.94, m | 2.10, m | |
| 8 | 4.33, m | 4.14, m | 4.27, qd (8.6, 2.9) |
| 9 | 2.53, dd | 2.55, dd | 2.27, m |
| (13.5, 6.9) | (13.2, 8.0) | ||
| 2.81, dd | 2.62, dd | 2.49, dd | |
| (13.5, 4.6) | (13.2, 3.4) | (12.0, 8.6) | |
| 11 | 3.99, d (18.5) | 3.90, d (17.2) | 3.55, d (16.0) |
| 4.13, d (18.5) | 3.99, d (17.2) | 4.21, d (16.0) | |
| 13 | 6.25, d (2.3) | 6.10, d (2.3) | |
| 15 | 6.59, s | 6.34, d (2.3) | 6.34, d (2.3) |
| 19 | 3.77, s | 3.77, s | 3.78, s |
| 14-OH | 5.70, s | 5.62, br s | 6.07, br s |
a
δ in ppm, mult (J in Hz).