Intermediate of scutellarin, and preparation method and application thereof
A reaction and compound technology, applied in the field of total synthesis of active ingredients of natural medicines, can solve the problems of difficulty, occupation of land resources, and high production costs
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Embodiment 1
[0196] Synthesis of 2,6-dimethoxybenzoquinone (2-4)
preparation example 1
[0198]
[0199] In a 500mL Erlenmeyer flask, K 3 Fe(CN) 6 (2.0g, 7.0mmol) was dissolved in water (10.0g), and acetone (100g) and 1,3,5-trimethoxybenzene (2-3) (16.4g, 100mmol) were added to it, and stirred at 25°C After that, add H to it 2 o 2 (30%, 34g, 300mmol), stirred at 25°C for 20h, a yellow-green solid was precipitated, water (200mL) was added to the above reaction system, and 13.8g of a yellow solid was obtained by suction filtration, yield 82%, m.p.252-255°C.
preparation example 2
[0201] In a 500mL Erlenmeyer flask, K 3 Fe(CN) 6 (2.0g, 7.0mmol) was dissolved in water (10.0g), and acetonitrile (100mL) and 1,3,5-trimethoxybenzene (2-3) (16.4g, 100mmol) were added to it, stirred at 5°C After that, add H to it 2 o 2 (30%, 34g, 300mmol), stirred at 25°C for 20h, a yellow-green solid was precipitated, water (200mL) was added to the above reaction system, and 12.4g of a yellow solid was obtained by suction filtration, yield 74%, m.p.252-255°C.
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