Preparation method of furilazole

A technology of furoxazil and furanformaldehyde, which is applied in the direction of organic chemistry, can solve the problems of high requirements for reaction conditions, low yield, and complicated methods, and achieve the effects of simple operation, high yield, and reduced side reactions

Inactive Publication Date: 2012-08-01
NANJING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no patent on the synthesis method of furoxazolidine in China, only the preparation method o

Method used

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  • Preparation method of furilazole
  • Preparation method of furilazole
  • Preparation method of furilazole

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preparation example Construction

[0019] The preparation method of furoclofenazole of the present invention, its steps are as follows:

[0020] The first step: with ZnI 2 、CuI 2 , Any one of KI Lewis acid catalysts is a catalyst, adding furanformaldehyde and trimethylsilylnitrile, wherein the molar ratio of furfuraldehyde and trimethylsilylnitrile is 1:1.0~1.5, and the reaction temperature is 5~20°C , The reaction time is 1.0~4.0h, and the reaction produces а-(2-furan)-а-trimethylsiloxyacetonitrile.

[0021] The second step: using one of ether and tetrahydrofuran as a solvent, reduce а-(2-furan)-а-trimethylsiloxyacetonitrile with lithium aluminum hydride, react under reflux for 1.0~3.0h, and use acetonitrile, methanol Recrystallization from other solvents gave а-aminomethyl-2-furanmethanol.

[0022] The third step: using any solvent in benzene, ethyl acetate, chloroform, and toluene as an entrainer, add а-aminomethyl-2-furyl methanol, toluenesulfonic acid, acetone, wherein а-aminomethyl- The molar ratio of...

Embodiment 1

[0025] The first step: add 0.10mol (CH 3 ) 3 SiCN and 30 mg ZnI 2 ;Slowly add furfural formaldehyde dropwise, the molar ratio of the two is 1:1.0, after the dropwise addition, continue to react at 5~10°C for 1h; after the reaction is finished, filter with diatomaceous earth to remove ZnI 2 Solid, the product obtained is yellow oily liquid A.

[0026] Step 2: Add 100ml of anhydrous ether to a 250ml four-neck flask, and then add 2.09gLiAlH after the temperature drops to 0°C 4 , slowly add 0.1mol liquid A dropwise, and react under reflux conditions for 1 h after the dropwise addition. Then react at room temperature for 2 h, filter with suction, wash the filter cake with ether, combine the filtrates, and wash with anhydrous MgSO 4 After drying, a yellow solid was obtained by rotary evaporation, and the filter cake and the yellow solid obtained by rotary evaporation were heated and dissolved with 100ml of tetrahydrofuran and filtered with suction, and the filter cake was washed...

Embodiment 2

[0054] Reaction step is exactly the same as embodiment 1, and difference: select CuI for the first step 2 It is a Lewis acid catalyst, the molar ratio of the reactants is 1:1.3, the reaction temperature is 10~15°C, and the reaction time is 2.5h; in the second step, tetrahydrofuran is selected as the reaction solvent, the reaction time is 2h, and acetonitrile is used for recrystallization; the third step Use ethyl acetate as the entrainer, the molar ratio of the reactants is 1:1.3, and the reflux reaction time is 2.5h; in the fourth step, triethylamine is selected as the acid-binding agent, and the molar ratio of the reactants is 1:1.2; the reaction temperature The temperature is -5~0℃, the reaction time is 10h, and benzene is used as the recrystallization solvent.

[0055] The confirmation method of the compound of this article embodiment is the same as that of Example 1.

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Abstract

The invention discloses a preparation method of furilazole, which comprises the following steps: 1, carrying out a nucleophilic addition reaction on furfural and trimethylsilyl cyanide; 2, reducing a-(2-furan)-a-trimethylsiloxy acetonitrile; 3, carrying out an addition elimination reaction on a-aminomethyl-2-furancarbinol and acetone; and 4, amidating 5-(2-furan)-2,2-dimethyloxazolidine. The preparation method has the advantages of simple process operation, and pureness and high yield of the target product, and provides another approach for the synthesis of like herbicide safeners.

Description

technical field [0001] The invention belongs to the fields of organic synthesis and pesticide synthesis, and in particular relates to a preparation method of a novel dichloroacetyloxazolidine herbicide safener. Background technique [0002] Dichloroacetyloxazolidine compounds are a new type of herbicide safener. Foreign countries have begun to study the synthesis and application of herbicide safeners since the 1970s, and have successively developed many different varieties (for example: AD-67, R-28725, R-29148, etc.). The research on the synthesis and biological activity of herbicide safeners started relatively late in China, among which the herbicide safeners with dichloroacetamide structures are the most researched, and these safeners can better protect crops such as corn, sorghum and rice. Protected from the harm of chloroacetanilides (such as acetochlor) and thiocarbamate herbicides (such as EPTC), especially for sulfonylureas and imidazolinone herbicides, it has a good...

Claims

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Application Information

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IPC IPC(8): C07D413/04
Inventor 黄启凤蔡春魏晓廷石永飞
Owner NANJING UNIV OF SCI & TECH
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