Table 2 ¹H and ¹³C NMR data of compounds 2 in chloroform-d

1

161.69

12.6 (1H, s, −OH)

161.7

12.53 (1H, s, −OH)

1a

115.22

–

114.7

–

2

125.31

7.28 (1H, s)

124.6

7.32 (1H, q, J = 0.7 Hz)

3

152.44

–

151.6

4

125.75

–

128.5

4a

132.72

–

131.6

5

120.11

7.55 (1H, dd, J = 1.5, 7 Hz)

119.3

7.56 (1H, dd, J = 1.5, 7 Hz)

5a

134.27

–

134.4

6

137.12

7.57 (1H, dd, J = 7, 8 Hz)

137.4

7.75 (1H, dd, J = 7, 8 Hz)

7

123.85

7.21 (1H, dd, J = 1.5, 8 Hz)

123.3

7.30 (1H, dd, J = 1.5, 8 Hz)

8

159.51

11.9 (1H, s, -OH)

161.1

12.0 (1H, s, -OH)

8a

115.37

–

115.5

–

9

192.68

–

192.5

–

10

182.66

–

181.9

–

1’

106.07

–

104.7

–

2’

163.27

5.7 (1H, s (br), -OH)

163.3

8.95 (1H, s (br), -OH)

3’

107.14

–

107.3

–

4’

163.07

–

162.4

–

5’

90.61

6.19 (1H, s)

91.2

6.24 (1H, s)

6’

162.85

14.3 (1H, s, -OH)

161.9

–

ArCH₃

21.02

2..21 (3H, s)

20.4

2.17 (3H, d, J = 0.7 Hz)

OCH₃

55.56

3.91 (3H, s)

55.6

3.98 (3H, s)

COCH₃

33.14

2.70 (3H, s)

32.6

2.62 (3H, s)

COCH₃

202.3

–

202.3

–