Method for synthesizing marine natural product Aureol
A technology of natural products and synthetic methods, applied in the direction of organic chemistry, organic chemistry, etc., can solve the problems of long reaction route, low yield, unsuitable for industrial production, etc., achieve high total yield, good product selectivity, and reaction The effect of fewer steps
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Embodiment 1
[0015] Embodiment 1: the synthesis of rearrangement iodide (4, see accompanying drawing)
[0016] Dissolve 1 g (3, 2.6 mmol) of (+) Sclareus iodide in 30 ml of anhydrous dichloromethane, add 0.75 ml (5.3 mmol) of boron trifluoride ether at -40 °C, and stir for 30 minutes , TLC detects that the reaction is complete. Add 50 ml of water to the reaction system, extract with dichloromethane (30 mL x 3), combine the organic phases, wash with saturated brine, dry over anhydrous sodium sulfate, filter, concentrate, and purify by column chromatography to obtain a colorless oily substance 0.53 Gram, the yield is 63%.
Embodiment 2
[0017] Embodiment 2: the synthesis of skeleton compound (6, see accompanying drawing)
[0018] Dissolve 0.5 g (4, 1.5 mmol) of the rearranged iodide in 25 ml of anhydrous tetrahydrofuran, and add 220 mg (0.6 mmol) of (1,1'-bis(diphenylphosphino)ferrocene)nickel dichloride , repeatedly filling and exhausting argon gas three times, exhausting the air. Another 25 ml (5, 15 mmol) of 1-iodo-2,5-dimethoxyphenyl Grignard reagent was slowly added dropwise to the above reaction system, and the temperature was raised to 68 o C, the reaction was stirred for 36 hours, and the reaction was detected by TLC. At room temperature, add 50 ml of water to the reaction system, extract with ethyl acetate (30 mL x3), combine the organic phases, wash with saturated brine, dry over anhydrous sodium sulfate, filter, concentrate, and purify by column chromatography to obtain a colorless oil 0.57 g of liquid, the yield is 56%.
[0019] The present invention relates to the reaction of (+) Sclareus iodi...
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