Table 2 ¹ H NMR spectroscopic data for compounds 1–3 (δ in ppm, mult., J in Hz)

1a

5.22 dd (16.2, 1.8)

1.09 t (7.2)

1.10 t (7.2)

1b

5.09 dd (10.2, 1.8)

2

6.36 dt (16.2, 10.2)

2.29 qd (7.2, 7.2)

2.30 qd (7.2, 7.2)

2.29 qd (7.2, 7.2)

2.30 qd (7.2, 7.2)

3

6.31 dd (15.0, 10.2)

6.50 dt (15.0, 7.2)

6.51 dt (15.0, 7.2)

4

5.72 dd (15.0, 7.2)

6.76 ddt (15.0, 12.0, 1.2)

6.78 ddt (15.0, 10.2, 1.2)

5

4.06 m

7.20 d (12.0)

7.22 d (10.2)

6

3.70 t (7.8)

7

2.83 quintet (7.8)

5.43 s

5.44 s

8

5.61 dd (14.4, 7.8)

9

6.20 dd (14.4, 10.2)

6.41 dd (15.6, 1.8)

6.38 dd (15.6, 1.2)

10

6.23 ddt (15.0, 10.2, 1.2)

6.98 ddd (15.6, 5.0, 1.8)

6.79 dd (15.6, 6.0)

11

5.76 dt (15.0, 5.4)

4.25 br q (5.0)

3.85 qd (6.0, 1.2)

12a

4.08 dd (5.4, 1.2)

3.51 dd (10.8, 5.0)

3.55 dd (10.2, 6.0)

12b

3.48 dd (10.8, 5.0)

3.49 dd (10.2, 6.0)

13a

4.06 ^b

9.42 s

9.42 s

13b

3.70 t (7.8)

11-OCH₃

3.31 s