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Table 1 The structures of ligustrazine derivatives L1–21

From: Ligustrazinyl amides: a novel class of ligustrazine-phenolic acid derivatives with neuroprotective effects

Structure

Yield

Structure

Yield

L1

90.7%

L2

83.5%

L3

86.3%

L4

85.8%

L5

90.1%

L6

83.6%

L7

91.3%

L8

88.5%

L9

81.6%

L10

85.2%

L11

68.9%

L12

81.8%

L13

76.9%

L14

78.4%

L15

84.3%

L16

93.7%

L17

71.3%

L18

74.8%

L19

77.2%

L20

80.1%

L21

64.3%