Table 1.
1H NMR Spectroscopic Data for Compounds 2 – 5.
| 2 | 3 | 4 | 5 | |
|---|---|---|---|---|
| Position | δHa (J in Hz) | δHa (J in Hz) | δHb (J in Hz) | δHb (J in Hz) |
| 1 | 2.58, br d (11.4) | 2.58, br d (10.2) | 2.54, br d (10.6) | 2.43, br d (10.6) |
| 2 | a: 1.99, m | a: 1.91, m | a: 1.89, m | a: 1.93, m |
| b: 1.37, qd (11.4, 5.4) | b: 1.42, qd (11.7, 5.4) | b: 1.50, qd (11.7, 5.5) | b: 1.45, qd (11.7, 5.4) | |
| 3 | 2.08, m | a: 2.06, m | a: 1.98, m | a: 2.08, m |
| b: 1.88, m | b: 1.95, m | b: 1.93, m | ||
| 5 | 5.79, d (4.1) | 5.52, br s | 5.71, br d (5.1) | 5.57, br d (4.4) |
| 6 | 2.04, m | 2.10, m | 2.11, m | 2.10, m |
| 7 | 1.53, tt (10.2, 5.1) | 1.65, tt (10.2, 5.1) | 1.68, td (10.3, 5.1) | 1.52, ddd (3.2, 8.7, 10.7) |
| 8 | a: 2.15, dt (19.8, 5.1) | a: 2.27, dt (19.8, 5.1) | a: 2.38, dt (19.6, 5.1) | 4.13, br d (8.7) |
| b: 1.97, m | b: 2.02, m | b: 2.01, m | ||
| 9 | 7.14, br s | 7.10, br s | 6.95, br t (3.9) | 6.79, d (1.8) |
| 11 | 2.03, m | 2.05, m | 2.25, m | |
| 12 | 0.83, d (6.8) | a: 3.77 (dd, 4.8, 10.6) | 1.23, s | 1.00, d (7.1) |
| 13 | 0.90, d (6.8) | 1.03, d (7.0) | 1.18, s | 1.10, d (7.1) |
| 14 | ||||
| 15 | 4.03, br s | 1.68, br s | 1.66, br s | 1.68, br s |
a
CDCl3, 300 MHz.
b
Acetone-d6, 300 MHz.