Table 4 NMR spectral data of compounds 1 and 2 in CDCl₃

1

109.7

122.0

2

158.7

159.5

3

90.4

6.12 (s)

C-1, C-4, C-5, C-β

98.7

6.44 (d, 2.3)

C-1, C-2, C-5

4

159.5

158.4

5

90.4

6.12 (s)

C-1, C-3, C-4, C-β

104.1

6.41 (dd, 8.2, 2.3)

C-1, C-3

6

158.7

130.3

7.07 (d, 8.2)

C-2, C-3, C-4, C-β

1′

129.9

130.2

2′

130.8

7.92 (d, 8.7)

C-1′, C-3′, C-4′, C-6′, C = O

130.8

7.91 (d, 8.8)

C-1′, C-3′, C-4′, C-6′, C = O

3′

115.2

6.87 (d, 8.7)

C-1′, C-2′, C-5′

115.3

6.88 (d, 8.8)

C-1′, C-4′, C-5′

4′

160.2

160.2

5′

115.2

6.87 (d, 8.7)

C-1′, C-3′, C-6′

115.3

6.88 (d, 8.8)

C-1′, C-3′, C-4′

6′

130.8

7.92 (d, 8.7)

C-1′, C-2′, C-4′, C-5′, C = O

130.8

7.91 (d, 8.8)

C-1′, C-2′, C-4′, C = O

α

38.4

3.04 (m)

C-1, C-β, C = O

38.9

3.17 (m)

C-1, C-β, C = O

β

18.6

2.97 (m)

C-1, C-6, C-α, C = O

25.4

2.95 (m)

C-1, C-2, C-6, C-α C = O

2-OCH₃

55.6

3.80 (s)

C-2

55.4

3.78 (s)

C-2

4-OCH₃

55.3

3.76 (s)

C-4

55.3

3.78 (s)

C-4

6-OCH₃

55.6

3.80 (s)

C-6

C = O

200.3

-

-

199.3