Table 1 ¹H NMR spectra data for compounds TS1–TS3 (CDCl₃, 400 MHz); J values in hertz are given in parentheses

2

5.93 (d, 9.5)

5.97 (d, 9.5)

5.91 (d, 9.6)

3

7.08 (d, 9.5)

7.09 (d, 9.5)

7.05 (d, 9.6)

5

2.93 (d, 12.6)

2.92 (d, 12.6)

3.35, s

6

4.40 (dd, 12.6, 3.8)

4.47 (dd, 12.6, 4.0)

—

7

3.95 (d, 3.8)

5.51 (d, 4.0)

4.75, s

11

3.81 (dd, 6.4, 1.5)

3.97 (dd, 6.4, 1.4)

3.6 (dd, 5.6, 1.3)

12

1.94, 1.88, m

1.94, 1.88, m

1.95, 1.78, m

15

3.43 (dd, 8.8, 2.9)

3.45 (dd, 8.8, 3.0)

3.30 (dd, 8.8, 2.9)

16

2.20, 1.90, m

2.19, 1.59, m

2.22, 1.88, m

17

2.60 (dd, 11.2, 6.7)

2.54 (dd, 11.3, 6.5)

2.60 (dd, 11.2, 6.7)

18

0.80, s

0.78, s

0.78, s

19

1.41, s

1.44, s

1.41, s

21

7.13, s

7.05, s

7.12, s

22

6.18 (d, 1.6)

6.10, (d, 1.6)

6.15 (d, 1.6)

23

7.36 (d, 1.6)

7.35 (d, 1.6)

7.36 (d, 1.6)

28

3.88, 3.75 (d, 7.3)

3.80, 3.59 (d, 7.3)

4.05, 3.92 (d, 7.2)

29

1.37, s

1.39, s

1.34, s

30

1.10, s

1.30, s

1.18, s

3′

—

2.00, s

—

4′

—

5.90, 5.67 (d, 2)

—