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Table 3 1 H and 13 C NMR assignments for syrinigc acid derivatives 3 and 4 a

From: Selective growth inhibition of human malignant melanoma cells by syringic acid-derived proteasome inhibitors

Position

3

4

 

δCb

δH(m, J Hz)

δCb

δH(m, J Hz)

1

125.3, C

-

125.2, C

-

2

106.9, CH

7.31 (s)

107.0, CH

7.31 (s)

3

153.3, C

-

153.2, C

-

4

141.1, C

-

141.2, C

-

5

153.3, C

-

153.2, C

-

6

106.9, CH

7.31 (s)

107.0, CH

7.31 (s)

1'

136.1, C

-

137.6, C

-

2'

128.2, CH

7.44 (d, 7.8)

113.8, CH

7.44 (d, 7.8)

3'

128.5, CH

7.39 (dd, 7.8, 7.2)

159.8, C

7.39 (dd, 7.8, 7.2)

4'

128.0, CH

7.28 (dd, 7.2, 7.2)

113.6, CH

7.28 (dd, 7.2, 7.2)

5'

128.5, CH

7.39 (dd, 7.8, 7.2)

129.7, CH

7.39 (dd, 7.8, 7.2)

6'

128.2, CH

7.44 (d, 7.8)

120.4, CH

7.44 (d, 7.8)

1'

137.4, C

-

138.9, C

-

2'

128.2, CH

7.46 (d, 7.2)

113.5, CH

7.46 (d, 7.2)

3'

128.6, CH

7.34 (dd, 7.8, 7.2)

159.6, C

7.34 (dd, 7.8, 7.2)

4'

128.3, CH

7.32 (m)

113.9, CH

7.32 (m)

5'

128.6, CH

7.34 (dd, 7.8, 7.2)

129.2, CH

7.34 (dd, 7.8, 7.2)

6'

128.2, CH

7.46 (d, 7.2)

120.5, CH

7.46 (d, 7.2)

7'-CH2

66.8, CH2

5.36 (s)

66.7, CH2

5.36 (s)

7'-CH2

74.9, CH2

5.08 (s)

74.9, CH2

5.08 (s)

3,5-OCH3

56.3, CH3

3.86 (s)

56.3, CH3

3.86 (s)

3'-OCH3

-

-

55.2c, CH3

 

5'-OCH3

-

-

-

-

3'- OCH3

-

-

55.3c, CH3

-

-COO-

166.2, C

-

166.2, C

-

OH

-

-

-

-

  1. aSpectra recorded in CDCl3. bMultiplicities were determined by DEPT 135. cAssignments may be interchanged.