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A kind of preparation method of prucalopride intermediate

A technology for prucalopride and intermediates, which is applied in the field of preparing prucalopride intermediates, can solve the problems of high synthesis cost, safety and high price, and achieves the advantages of low raw material price, many manufacturers, and expansion of industrial production scale. Effect

Active Publication Date: 2019-01-29
阜新峰成化工科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing reports, the intermediate has the following three synthetic routes: (1) Pharmaceutical and Clinical Research, 2011, 19 (4), 306-307. The rearrangement reaction temperature of the second step of this route is nearly 200°C, and the conditions are harsh , a total of seven steps are required, and the synthesis route is rather long, in which the third step oxidation reaction uses osmium tetroxide, and its price is relatively high, so the synthesis cost of this synthesis route is relatively high; (2) J Heterocyclic Chem, 1980, 17( 6): 1333-5. Both the second and sixth steps of this route use butyllithium, which requires anhydrous and oxygen-free low-temperature operation, harsh conditions, and poor industrial feasibility; (3) American Chemical Society, 2003, 125-139 . The third step of this route is a ring-closing reaction catalyzed by zinc powder, which requires anaerobic operation. There is a process of initiating the reaction during the reaction, which is easy to accumulate and release heat, and there are potential safety hazards in industrial production.
[0004] It can be seen that the existing synthetic routes are not easy to industrialized production

Method used

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  • A kind of preparation method of prucalopride intermediate
  • A kind of preparation method of prucalopride intermediate
  • A kind of preparation method of prucalopride intermediate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 77 g of aluminum trichloride to 500 mL of dichloromethane, cool to 0-10 °C, add 26 g of chloroacetyl chloride dropwise, control the temperature at 0-10 °C, stir for 0.5 h, and the stirring speed is 300 r / min. Add the dichloromethane solution (50g+500mL dichloromethane) of the starting material I dropwise to the reaction system, the temperature is 0-10°C, keep stirring for 4 hours, and the stirring speed is 300r / min; add 500mL6% hydrochloric acid solution dropwise, control When the temperature is lower than 20°C, use a separatory funnel to separate the dichloromethane from the organic layer, and concentrate the organic layer under reduced pressure until no dichloromethane is evaporated (the temperature is not higher than 60°C) to obtain an oil, and add 50 mL of anhydrous Ethanol and 450mL water were beaten and dispersed at 0-10°C for 1h, suction filtered, and air-dried at 50-60°C for 8h to obtain intermediate (II), 52g of light gray solid, with a yield of 83%.

[002...

Embodiment 2

[0028] Add 128g of aluminum trichloride to 1000mL of dichloromethane, cool to 0-10°C, add 52g of chloroacetyl chloride dropwise, control the temperature at 0-10°C, stir for 0.5h, and the stirring speed is 300r / min. Add the dichloromethane solution of starting material I (100g + 1000mL dichloromethane) dropwise to the reaction system, control the temperature at 0-10°C, and keep stirring for 4h after the addition. Add 1000mL of 6% hydrochloric acid solution dropwise, control the temperature below 20°C, separate the organic layer with dichloromethane with a separatory funnel, and concentrate the organic layer under reduced pressure until no dichloromethane evaporates (temperature is not higher than 60°C) to obtain an oily substance , adding 100mL ethanol and 900mL water to the oil, beating and dispersing at 0-10°C for 1h, suction filtration, and drying to obtain intermediate (II), 92g of light gray solid, yield 73%.

[0029] Add 75g of intermediate (II) to 450mL of N,N-dimethylfo...

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Abstract

The invention belongs to the field of medicine synthesis, and particularly relates to a method for preparing a prucalopride intermediate. The method comprises the following steps: performing acylation and demethylation reactions on 2-methoxy-4-acetylamino-5-chloro methyl benzoate (I) serving as an initial raw material at 0-20 DEG C under the action of a proper amount of an acylating agent and lewis acid to obtain an intermediate (II); adding an alkaline reagent into the intermediate (II), and performing cyclization reaction at 0-20 DEG C in a polar solvent to obtain an intermediate (III); adding hydrazine hydrate and absolute ethyl alcohol to the intermediate (III), and performing reduction reaction at 70-80 DEG C to obtain an intermediate (IV); performing hydrolysis reaction on the intermediate (IV) at 90-100 DEG C under the action of a sodium hydroxide solution to obtain sodium salt of an intermediate (V), and acidizing with hydrochloric acid to obtain the intermediate (IV). The synthesizing route has mild reaction condition, low production cost and high yield, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of pharmaceutical synthesis, in particular to a method for preparing prucalopride intermediates. Background technique [0002] Prucalopride, chemical name 4-amino-5-chloro-2,3-dihydro- N -[1-(3-methoxypropyl)-4-piperidinyl]-7-benzofurancarboxamide, its succinate is commonly used clinically as a highly selective serotonin receptor agonist. It can stimulate the peristaltic reflex in humans, enhance the contraction of the colon, and accelerate gastric emptying. It can increase the defecation frequency of patients with constipation and reduce the hardness of the stool. It is mainly used to treat various constipation and postoperative gastrointestinal motility and pseudo-obstruction. It is an effective intestinal motility drug. Clinically indicated for the symptomatic treatment of chronic constipation in women not adequately relieved by laxatives. The listing of prucalopride provides a safer, more effective and more sym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/79
CPCC07D307/79
Inventor 王吉曹荣浩
Owner 阜新峰成化工科技发展有限公司
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