Method for preparing 3-fluorooxetane-3-methanol and intermediate of 3-fluorooxetane-3-methanol

A technology for fluorooxetane and intermediates, which is applied in the field of preparation of 3-fluorooxetane-3-methanol and its intermediates, and can solve the problems of unsuitable scale-up production, high total cost, and environmental pollution. friendly questions

Active Publication Date: 2018-03-13
SHANGHAI CHEMPARTNER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that, in order to overcome the total production process of 3-fluorooxetane-3-methanol and its intermediates in the prior art The problems of high cost, low yield, unfriendly to the ...

Method used

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  • Method for preparing 3-fluorooxetane-3-methanol and intermediate of 3-fluorooxetane-3-methanol
  • Method for preparing 3-fluorooxetane-3-methanol and intermediate of 3-fluorooxetane-3-methanol
  • Method for preparing 3-fluorooxetane-3-methanol and intermediate of 3-fluorooxetane-3-methanol

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Experimental program
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Embodiment 1

[0083] Sodium hydride (3.6 g, 0.15 mol) was added to tetrahydrofuran (120 mL) in batches, the temperature was lowered to -10 °C to -5 °C, the temperature was controlled at -10 °C to -5 °C, and diethyl fluoromalonate ( 15g, 0.084mol), the dropwise addition was completed in 3 to 4 hours. The system turned gray at night, and was stirred at -10°C to -5°C for half an hour. Chloromethyl benzyl ether (16.4 g, 0.1 mol) was added dropwise, the temperature was controlled at -10°C to -5°C, and the dropwise addition was completed in 4 to 6 hours. After dripping, the mixture was kept at -10°C to -5°C and stirred for 1 hour, then sampled and sent to TLC, and the reaction was completed. Saturated brine was added to the system, stirred for half an hour, the layers were separated, and the aqueous phase was extracted once with ethyl acetate. The organic phases were combined and washed with saturated sodium bicarbonate, dried over anhydrous sodium sulfate, filtered with suction, and the filtra...

Embodiment 2

[0085] 2-Fluoro-2-benzyloxymethyl-malonate diethyl ester (20 g, 0.067 mol) was dissolved in tetrahydrofuran (220 mL), and after stirring uniformly, sodium borohydride (4.2 g, 0.11 mol) was added, and the temperature was controlled. 30 ℃~45 ℃, after adding, stirring for 1 hour, sampling and sending to TLC, after the reaction is completed, add water to the system, after stirring for half an hour, concentrate until there is an off-white solid to separate out, add ethyl acetate, adjust the pH with 1 mol / L hydrochloric acid =1-2, separated, the aqueous phase was extracted twice with ethyl acetate, the organic phases were combined, the pH value was adjusted to 7-8 with 50% sodium hydroxide solution, the organic phase was washed with water, washed with saturated brine, and anhydrous sulfuric acid Dry over sodium and concentrate to dryness to give 2-fluoro-2-benzyloxymethyl-propanediol (13 g, 0.061 mol) in 90% yield.

Embodiment 3

[0087] Dissolve 2-fluoro-2-benzyloxymethyl-propanediol (10 g, 0.0467 mol) in tetrahydrofuran (120 mL), add diisopropylethylamine (14.1 g, 0.11 mol), stir evenly, and control the temperature to 0~ Add p-toluenesulfonyl chloride (21.2 g, 0.11 mol) dropwise at 5°C, after the addition, stir for half an hour and sample for TLC, the reaction is complete; add saturated brine to quench the reaction, separate layers, and extract the aqueous phase with ethyl acetate for 2 Second, the organic phases were combined, washed with saturated brine, dried over anhydrous sodium sulfate, concentrated to dryness, crystallized with petroleum ether, filtered, and dried to obtain 2-(benzyloxymethyl)-2-fluoro-bis(p-methyl) benzenesulfonic acid)-1,3-propanediol ester (20.7 g, 0.0397 mol) in 85% yield.

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Abstract

The invention discloses a method for preparing 3-fluorooxetane-3-methanol and an intermediate of 3-fluorooxetane-3-methanol. The method comprises the following steps of: performing a cyclization reaction on a compound represented by a formula 5 and strong base in organic solvent so as to obtain a compound represented by a formula 6, wherein R1 is a methylsulfonyl group or a p-methylphenylsulfonylgroup or a p-trifluoromethylbenzenesulfonyl group or a trifluoromethylsulfonyl group; preforming a reaction on magnesium and the compound represented by the formula 6 in organic solvent so as to obtain a compound 7. The method has the advantages of being high in yield, simple to operate and simple in post-treatment, and is suitable for large-scale production.

Description

technical field [0001] The present invention relates to a preparation method of 3-fluorooxetane-3-methanol and an intermediate thereof. Background technique [0002] Oxetane compounds are an important class of pharmaceutical intermediates and play an important role in drug research and development due to their unique structures. Its unique cyclic rigid structure can increase the metabolic stability of the drug molecule while maintaining or reducing the lipophilicity of the drug molecule. In addition, due to its sufficient volume, it is beneficial to occupy the cavity of the drug target, and the oxygen atom on the four-membered ring and the acceptor can form hydrogen bonds, which are beneficial to improve the drug activity (Angle.Chem.Int.Ed. , 2006, 45, 7736-7739; J. Med. Chem. 2010, 53, 3227-3246). [0003] 3-Fluorooxetane-3-methanol is a kind of oxetane compound, in addition to containing oxetane structure, there is a fluorine substituent at the 3 position. Fluorine is ...

Claims

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Application Information

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IPC IPC(8): C07D305/08C07C303/30C07C309/66C07C309/73
CPCC07C303/30C07D305/08C07C309/66C07C309/73Y02P20/55
Inventor 许祖盛陈功潘金浩邢胜园徐华东韩洪波李玉禄
Owner SHANGHAI CHEMPARTNER CO LTD
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