Fludioxonil synthesis
- Product Name:Fludioxonil
- CAS Number:131341-86-1
- Molecular formula:C12H6F2N2O2
- Molecular Weight:248.18
119895-68-0
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105-34-0
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$5.00/25g
131341-86-1
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$39.00/50mg
Yield:131341-86-1 91.2%
Reaction Conditions:
Stage #1: 2,2-difluoro-1,3-benzodioxol-4-yl-carbaldehyde;methyl 2-cyanoacetatewith triethylamine in methanol at 20; pH=9.5; for 7 h;
Stage #2: with [(p-methylphenyl)sulfonylmethyl]isonitrile;potassium hydroxide in methanol at 0 - 10; for 3 h;pH-value;Reagent/catalyst;Temperature;
Steps:
1-10; 1-2 Example 1
5g of 2,2-difluoro-2H-1,3-benzodioxole-4-carbaldehyde (purity of 99% by weight, prepared according to the method in Example 2 of US5194628, the same below), catalytic amount of triethylamine and 23g Methanol is placed in the reaction flask, the pH is about 9.5, 2.66g methyl cyanoacetate (purity 99% by weight) is added dropwise for 1 hour at room temperature, after the addition is complete, the reaction is stirred at room temperature for 6 hours, sampling is controlled and the reaction is After completion, the normalized content of the main product is 98%, the temperature is reduced to 0-5°C, 5.3g of TosMIC (purity 98% by weight) is added, and the temperature is maintained at 0-10°C, and 2.1eq. 21% by weight potassium hydroxide methanol solution ( 15.2g). After 1 hour of dripping, the addition of drops was completed, the reaction was kept for 2 hours, the sampling was controlled, the reaction was completed, 5% by weight dilute hydrochloric acid was added to adjust the pH to 8.5, water was added for filtration, and the filter cake was dried to obtain 6.2g of fludioxonil. The purity is 99.24% by weight, the normalized content is 99.68%, and all organic impurities are less than 0.1%. The total yield of the two steps is 91.2%.
References:
CN111285854,2020,A Location in patent:Paragraph 0060-0084
36635-61-7
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131341-86-1
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$39.00/50mg
119895-68-0
124 suppliers
$11.00/250mg
131341-86-1
270 suppliers
$39.00/50mg
824-79-3
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131341-86-1
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16563-14-7
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131341-86-1
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$39.00/50mg