Synthetic method for 1-{2-floro-4-[5-(4-isobutyl phenyl)-1,2,4-oxadiazol-3-yl]-benzyl}-3-azetidinecarboxylic acid
A technology of isobutylphenyl and azetidine carboxylic acid, applied in directions such as organic chemistry, can solve problems such as high cost and unfavorable industrial production, and achieve the effects of reducing cost, avoiding the use of a large amount of solvent, and reducing by-products
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0062] Example 1 Screening of the synthetic method of the present invention——step (1)
[0063] According to the step (1) of Comparative Example 1, the crude compound of formula 1-5 was prepared and characterized, and the purity was 77.25% as determined by LCMS.
[0064] The obtained crude product was screened for crystallization and purification conditions. The crystallization operation is to dissolve the crude product with a crystallization solvent, crystallize at 20°C, filter, and vacuum dry to obtain an off-white solid product which is 2-fluoro-4-[5-(4-isobutyl Phenyl)-1,2,4-oxadiazol-3-yl]-benzyl alcohol, the purity was checked by LCMS.
[0065] First, carry out the above crystallization operation as listed in Table 1 to screen out the preferred crystallization solvent.
[0066] Table 1. Screening of solvents and their dosage for crystallization purification
[0067]
[0068] It can be seen from Table 1 that in the crystallization conditions using a single solvent,...
Embodiment 2
[0077] Example 2 Screening of the synthetic method of the present invention——step (2)
[0078] Step (2) of the inventive method is carried out according to the following process:
[0079] The purified 2-fluoro-4-[5-(4-isobutylphenyl)-1,2,4-oxadiazol-3-yl]-benzyl alcohol solution shown in Formula 1-5 obtained in Example 1 In the reaction solvent, add active manganese dioxide. After heating the reaction solution to reflux and continuing the reaction, the temperature was lowered to room temperature. Filter and collect the light yellow filtrate, dry it with anhydrous sodium sulfate, and concentrate under reduced pressure to obtain 2-fluoro-4-[5-(4-isobutylphenyl)-1 represented by the formula 1-6 as a white solid product, 2,4-Oxadiazol-3-yl]-benzaldehyde, the conversion rate was detected by LCMS.
[0080] First, carry out the above synthesis steps as listed in Table 4, to screen out the preferred reaction solvent. The moles of 2-fluoro-4-[5-(4-isobutylphenyl)-1,2,4-oxadiazol-...
Embodiment 3
[0092] Example 3 Screening of the synthetic method of the present invention——step (3)
[0093] Step (3) of the inventive method is carried out according to the following process:
[0094] At room temperature, 2-fluoro-4-[5-(4-isobutylphenyl)-1,2,4-oxadiazol-3-yl]-benzaldehyde represented by formula 1-6, formula 3-azetidinecarboxylic acid and glacial acetic acid shown in 1-7 were added to the reaction solvent, and stirred at 20°C for 2 hours. Dissolve NaBH3CN in methanol, then add the methanol solution of NaBH3CN dropwise into the reaction system within 1 hour, and stir the reaction at 20°C after the dropwise addition is completed. The reaction solution was filtered, and the filter cake was rinsed with methanol and then dried to obtain the compound of formula 2, which was a white solid 1-{2-fluoro-4-[5-(4-isobutylphenyl)-1,2,4-oxadiene Oxadiazol-3-yl]-benzyl}-3-azetidinecarboxylic acid, the conversion rate was detected by LCMS.
[0095] First, carry out the above synthesis...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com