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Synthetic method of atazanavir intermediate

A synthetic method and intermediate technology, applied in the field of drug synthesis, can solve the problems of low yield, high toxicity, and high cost, and achieve the effects of high yield, low cost, and convenient operation

Inactive Publication Date: 2018-05-25
金学芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There have been some reports on the synthesis of atazanavir intermediates, but they all generally have the disadvantages of high cost, long route, low yield and high toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: step (1) amide reaction:

[0023] In a 1-liter three-neck flask, add 52.4 grams of L-tert-leucine and 360 milliliters of water, add 64 grams of sodium hydroxide while stirring, cool down, slowly add 75.6 grams of methyl chloroformate, and control the temperature T≤25 °C , after dropping, heat up to 60°C, react for 18 hours, cool to room temperature, adjust PH=2 with concentrated hydrochloric acid, extract 3 times with ethyl acetate, dry the organic phase with anhydrous sodium sulfate, filter, concentrate the filtrate under reduced pressure, and concentrate to dryness Finally, beating with 200 ml of petroleum ether; suction filtration and drying to obtain 67.6 g of white solid. Yield: 89%.

Embodiment 2

[0024] Embodiment 2: step (2) condensation and hydrogenation reaction:

[0025] In a 250 ml three-necked flask, add 18.3 grams of 4-(2-pyridyl)-benzaldehyde, 5.88 grams of 85% hydrazine hydrate, and 150 milliliters of ethanol, heat the oil bath to 80°C, react for 2-3 hours, and cool down to T= At 25°C, add 1.4 g of palladium carbon with nitrogen gas, and then change to hydrogen gas, react for 24 hours, filter, recover palladium carbon, pass hydrogen chloride to the filtrate in an ice bath, until PH = 2-3, filter with suction, and dry to obtain light yellow Solid 23.6 grams. The yield of this step is 90%.

Embodiment 3

[0026] Embodiment 3: step (3) condensation reaction:

[0027] In a 500 ml three-necked flask, add 16.06 grams of N-methoxycarbonyl-L-tert-leucine, 16.26 grams of EDCl, 11.46 grams of HOBt, 240 milliliters of ethyl acetate, and add 9.36 grams of N-methylmorpholine while stirring After 30 minutes of reaction, 20.8 grams of 2-[4-(2-pyridyl)-benzyl]hydrazine hydrochloride, 9.36 grams of triethylamine, and 160 milliliters of ethyl acetate were added respectively, and the reaction was carried out for 4 hours. Sodium, water, and saturated brine were washed, the organic phase was dried with anhydrous sodium sulfate, filtered, and the filtrate was concentrated under reduced pressure to obtain 28.5 grams of a crude light yellow solid, which was recrystallized with ethyl acetate to obtain 21 g of a white solid with a purity of more than 99%. That is the intermediate of atazanavir. The yield of this step is 80%.

[0028] The overall yield of the entire method scheme was 64%.

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Abstract

The invention discloses a synthetic method of an atazanavir intermediate of N-1-[N-(methoxycarbonyl)-L-tert-leucine]-N-2-[4-(2-pyridyl)-benzyl] hydrazine. The synthetic method comprises (1) amidationreaction, (2) condensation and hydrogenation reaction and (3) condensation reaction. L-tert-leucine and methylchloroformate are subjected to amidation reaction to obtain N-methoxycarbonyl-L-tert-leucine, then 4-(2-pyridyl)-benzaldehyde and hydrazine hydrate are subjected to condensation reaction and hydrogenation reaction to obtain 2-[4-(2-pyridyl)-benzyl] hydrazine hydrochloride, and the 2-[4-(2-pyridyl)-benzyl] hydrazine hydrochloride and the N-methoxycarbonyl-L-tert-leucine are subjected to condensation reaction to obtain the atazanavir intermediate of the N-1-[N-(methoxycarbonyl)-L-tert-leucine]-N-2-[4-(2-pyridyl)-benzyl] hydrazine. The synthetic method of the atazanavir intermediate has the advantages of being low in cost, mild in reaction conditions, low in toxicity, convenient to operate, simple in raw material acquisition, high in yield and applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of drug synthesis, and in particular relates to a method for synthesizing an atazanavir intermediate. Background technique [0002] Atazanavir intermediate, its chemical name is N-1-[N-(methoxycarbonyl)-L-tert-leucinyl]-N-2-[4-(2-pyridyl)-benzyl] Hydrazine, its structural formula is: [0003] [0004] Atazanavir is an open-chain azapeptidomimetic compound and a novel HIV-1 protease inhibitor. Compared with other protease inhibitors, atazanavir has two significant advantages: firstly, it is the only protease inhibitor approved to be taken once a day, which will greatly simplify the dosage course; secondly, atazanavir has not been shown to increase the patient's Cholesterol and triglyceride levels, a challenge that all other protease inhibitors encounter to varying degrees. [0005] There have been some reports on the synthesis of atazanavir intermediates, but they generally have the disadvantages of high cost, lo...

Claims

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Application Information

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IPC IPC(8): C07D213/42
CPCC07D213/42
Inventor 金学芳
Owner 金学芳
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