Method for synthesizing astaxanthin intermediate
A synthesis method and an intermediate technology, applied in the field of astaxanthin preparation, can solve the problems of increased reaction route steps and costs, complex reaction route, cumbersome operation, etc., to avoid multiple introductions and repeated hydrolysis, simplify the process, and ensure Yield effect
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Embodiment 1
[0051] (1) Synthesis of 3-methyl-1-pentene-4-yn-3-alcohol lithium
[0052] Take 800ml of liquid ammonia, and cool it to -45°C with dry ice alcohol, take 10.5g of lithium particles, put it into the liquid ammonia, and put it in for 20 minutes. The system temperature is -40°C, the temperature difference is within 2°C, and keep warm for 40 minutes;
[0053] Pass acetylene for 1 hour, the flow rate is 0.6L / min, the temperature is controlled at -35°C, and then the alcohol bath is raised to 0°C to volatilize the liquid ammonia. As the liquid ammonia decreases to the remaining 500-600ml, start to drop 450g of toluene, raise the temperature to 10°C, continue to volatilize the liquid ammonia, and cool to -10°C after the addition of toluene is complete.
[0054] Dissolve 90g of 1-buten-3-one in 50g of toluene and add it dropwise to the above reaction system. Control the temperature to -5°C ~ -10°C, keep the temperature for 30 minutes after dropping, and generate lithium 3-methyl-1-pent...
Embodiment 2
[0067] The reaction condition of embodiment 2 is identical with embodiment 1, but the heterodiketone added in step (3) is 3,5,5,7-tetramethyl-1,2-dioxocyclopentabicyclo[ 4,1,0]-3-conen-4-one, the added mass is 240g.
[0068] Step (3) After the condensation reaction, the sample was measured, and the total yield of the first three steps was calculated to be 87%. The final product purity of embodiment 2 is 96%, and the total yield is 76%.
Embodiment 3
[0070] The reaction condition of embodiment 3 is identical with embodiment 1, but adopts sherwood oil to replace toluene to carry out liquid ammonia replacement in step (1).
[0071] After the condensation reaction in step (3) was completed, the sample was measured, and the total yield of the first three steps was calculated to be 85%. The final product purity of embodiment 2 is 94%, and the total yield is 74%.
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