Preparation method for moxifloxacin intermediate (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane

A technology of diazabicyclo and moxifloxacin, which is applied in organic chemistry methods, chemical instruments and methods, organic racemization, etc., can solve the problems of inconvenient large-scale production, high optical purity, and low content, and achieve the reduction of raw material consumption, Effect of avoiding purification process and reducing production cost

Active Publication Date: 2012-04-11
ZHEJIANG APELOA KANGYU PHARMA +2
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  • Application Information

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Problems solved by technology

The resolving agent that this method uses is more expensive, and consumption is big (molecular weight is big), and resolving agent is unstable under acidic conditions, is unfavorable for improving its recovery rate and causes resolving agent to account for a large proporti

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  • Preparation method for moxifloxacin intermediate (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane
  • Preparation method for moxifloxacin intermediate (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane
  • Preparation method for moxifloxacin intermediate (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1

[0052] 10.00g (40.94mmol) cis-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane in a 250ml reaction flask, add 100ml isopropyl acetate, room temperature Stir until all of it is dissolved, add 4.25g (24.54mmol) N-acetyl-L-leucine, heat up to 70-80℃ and react for 40 minutes, slowly reduce the temperature to 40℃, and crystals will precipitate, continue to cool down to 25℃, stir overnight. The next day, filter, wash the reaction flask with the filtrate, and wash the crystals with 4g×2 isopropyl acetate to obtain (1 S ,6 R )-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane·N-acetyl-L-leucine salt, wet weight 7.80g, reduced pressure at 40°C Dry, weighs 7.75g, theoretical yield is 90.69%, optical purity is 95.05% ee.

[0053] The 7.75g obtained above (1 S ,6 R )-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane·N-acetyl-L-leucine salt, recrystallized with 44g of acetonitrile, the obtained crystals are 40 Drying under reduced pressure at ℃ weighs 6.31g, the total yield ...

Example Embodiment

[0055] Example 2

[0056] (1 S ,6 R )-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane·N-acetyl-L-leucine salt 6.31g (15.11mmol) floating 15g To the methyl chloride, add 16g water and 1.5g NaHCO 3 , Stir at 31°C, after the two phases are clear, separate the organic phase, and extract the aqueous phase with 5g×2 dichloromethane. The organic phases were combined, dried with 5 g of anhydrous sodium sulfate, filtered, washed with 5 g of dichloromethane, and the obtained filtrate was recovered under reduced pressure to recover dichloromethane to obtain the product (1 S ,6 R )-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane 3.44g, [α] D 20 = -24.4?? (c=0.005, ethanol), the optical purity is 99.31%ee.

[0057] 1 HNMR (CDCl 3 , MHz) δppm: 7.23-7.34 (m, 5H), 4.62 (s, 2H), 3.79-3.81 (d, 1H), 2.79-2.85 (dd, 1H), 2.73-2.78 (m,1H), 2.61- 2.67 (m, 1H), 2.16 (br s, 1H), 1.89-1.97 (m, 1H), 1.59-1.68 (m, 1H), 1.45-1.51 (m, 2H).

[0058] 13 CNMR (CDCl 3 , MHz) δppm: 177.92, 177.76, 135.83, 128.61,...

Example Embodiment

[0059] Example 3

[0060] Method 46 Preparation (1 S ,6 R )-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane·N-acetyl-L-leucine salt 7.27g (17.41mmol) suspended in 15g toluene Medium, add 16g water and 1.6g NaHCO 3 , Stir at 30°C, after the two phases are clear, separate the organic phase, and extract the water phase with 5g×2 toluene. The organic phases were combined, dried with 5 g of anhydrous sodium sulfate, filtered, and washed with 4.5 g of toluene. The obtained filtrate was decompressed to recover toluene to obtain the product (1 S ,6 R )-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane 4.26g, optical purity: 92.63%ee.

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Abstract

The invention discloses a preparation method for moxifloxacin intermediate (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane. Crystallization of (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane N-acetyl-L-leucine diastereomeric salts is formed by Cis-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane and N-acetyl-L-leucine in a splitting solvent and dissociates in a alkaline liquid such as Na2CO3 or NaHCO3. The crystallization is extracted through an organic solvent and decompressed and concentrated through organic phases to obtain (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane. The preparation method for moxifloxacin intermediate (1S, 6R)-8-benzyl-7, 9-dioxy-2, 8-diazabicyclo [4.3.0] nonane has low production cost and is simple and convenient to split; moreover, fussy purge process during subsequent reaction is avoided. Products of the preparation method not only have high optical purity, but also have higher content.

Description

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Claims

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Application Information

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Owner ZHEJIANG APELOA KANGYU PHARMA
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