Novel ciprofibrate synthesis method
A new method and condensation technology, applied in the field of synthesizing ciprofibrate, can solve the problems of difficult large-scale industrialization, expensive raw materials, difficult operation, etc., and achieve the effect of simple and convenient industrial operation, stable process and convenient post-processing
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0050] A new method for synthesizing ciprofibrate, using p-hydroxybenzaldehyde as a starting material to obtain ciprofibrate through condensation decarboxylation, etherification, ring formation and alcoholysis, the specific steps include:
[0051] (1) Preparation of p-hydroxystyrene (Ⅱ)
[0052] Add 130g of p-hydroxybenzaldehyde, 165g of malonic acid, 600mL of DMF, and 7.8g of diethylamine into a 1L reaction flask, and heat to 150°C for 6h (monitored by TLC). After the reaction was complete, the reaction solution was cooled down to room temperature, and concentrated to dry DMF under reduced pressure. Add 500 mL of ethyl acetate and 100 mL of water to the residue for dilution, and adjust to 3-4 with 2 mol / L dilute hydrochloric acid in an ice bath. Separation, the organic phase was washed once with 200mL2mol / L sodium carbonate aqueous solution solvent, washed once with 200mL water, and finally washed once with 200mL saturated brine, dried over anhydrous sodium sulfate, filtered...
Embodiment 2
[0061] A new method for synthesizing ciprofibrate, using p-hydroxybenzaldehyde as a starting material to obtain ciprofibrate through condensation decarboxylation, etherification, ring formation and alcoholysis, the specific steps include:
[0062] (1) Preparation of p-hydroxystyrene (Ⅱ)
[0063] Add 150g of p-hydroxybenzaldehyde, 154g of malonic acid, 550mL of toluene, and 9g of pyrrolidine into a 1L reaction flask, and heat to 150°C for 6h (monitored by TLC). After the reaction was complete, the reaction solution was cooled down to room temperature, and concentrated to dry DMF under reduced pressure. Add 550 mL of ethyl acetate and 150 mL of water to the residue for dilution, and adjust to 3-4 with 2 mol / L dilute hydrochloric acid in an ice bath. Separation, the organic phase was washed once with 250mL2mol / L sodium carbonate aqueous solution solvent, washed once with 250mL water, and finally washed once with 250mL saturated brine, dried over anhydrous sodium sulfate, filtere...
Embodiment 3
[0072] A new method for synthesizing ciprofibrate, using p-hydroxybenzaldehyde as a starting material to obtain ciprofibrate through condensation decarboxylation, etherification, ring formation and alcoholysis, the specific steps include:
[0073] (1) Preparation of p-hydroxystyrene (Ⅱ)
[0074] Dissolve 130Kg of p-hydroxybenzaldehyde and 165Kg of malonic acid in 600Kg of DMF, pump the mixed solution into a 1000L stainless steel reaction axe, turn on the mechanical stirring, and then pump in 7.8Kg of ethylenediamine. Steam was heated to 150°C for 6h (monitored by HPLC). After the reaction is complete, turn off the steam, pass circulating water down to room temperature, and recover DMF under reduced pressure. Add 500L ethyl acetate and 100L water to the concentrated ax for dilution, and slowly add 2mol / L dilute hydrochloric acid dropwise to adjust the pH to 3-4. Separation, the organic phase was washed once with 200L2mol / L sodium carbonate aqueous solution solvent, washed onc...
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