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A kind of preparation method of 2-chloro-5-iodobenzoic acid

A technology of iodobenzoic acid and o-chlorobenzoic acid, applied in the field of pharmaceutical synthesis, can solve the problems of high production cost, long reaction steps, low product yield and the like, and achieves improved iodine utilization, simple operation and high yield. Effect

Active Publication Date: 2019-06-21
SHANDONG BOYUAN PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 2-Chloro-5-iodobenzoic acid is the starting material for the synthesis of SGLT-2 inhibitors such as Dapagliflozin and Empagliflozin, and the existing production method is complex in operation and high in production cost
[0005] The above-mentioned synthetic route still has the shortcoming of long reaction steps, inconvenient operation, and low product yield, which is not conducive to industrialized production

Method used

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  • A kind of preparation method of 2-chloro-5-iodobenzoic acid
  • A kind of preparation method of 2-chloro-5-iodobenzoic acid
  • A kind of preparation method of 2-chloro-5-iodobenzoic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 196g of concentrated sulfuric acid into the reaction flask at room temperature, slowly add 31.2g of o-chlorobenzoic acid, stir until it dissolves; cool down to -5~0°C, add 21.6g of nitric acid (concentration 65%) dropwise, during the dropwise addition Temperature control -5~5°C; after dropping at 0~5°C for 2 hours, TLC (DCM:MeOH=10:1) to monitor the reaction, add 200ml of ice water dropwise to quench the reaction, control the temperature below 25°C, stir Centrifuge after 30 min, wash with 500 ml of water, and dry under reduced pressure at 50°C overnight to obtain 38.5 g of off-white solid 2-chloro-5-nitrobenzoic acid with a purity of 98.5% and a yield of 95.8%.

Embodiment 2

[0030] Add 75g of 2-chloro-5-nitrobenzoic acid, 59g of iron powder, 800ml of ethanol, 150ml of water, 115g of ammonium chloride into the reaction flask, heat to 78-80°C and reflux for 5h, TLC (PE / EA: 1 / 3) After monitoring the reaction, filter while it is hot, wash with 150ml of hot ethanol, evaporate the filtrate to dryness at 60°C to obtain the crude product, add 400ml of ethyl acetate, heat and reflux for beating for 2 hours, cool down to room temperature naturally, and then cool down to 0-5°C in a salt water bath to crystallize After more than 30 minutes, centrifuge, wash with 50ml of ethyl acetate, and dry under reduced pressure at 50°C to obtain 60.7g of 2-chloro-5-aminobenzoic acid as a yellow solid with a purity of 99.1% and a yield of 95.1%.

Embodiment 3

[0032] Add 123 g of 2-chloro-5-aminobenzoic acid into 2000 g of 20% sulfuric acid aqueous solution, keep stirring at 0-10°C, add dropwise an aqueous solution of sodium nitrite (51 g of sodium nitrite dissolved in 200 g of water), and stir until There is no solid in the reaction solution, TLC (PE / EA: 1 / 3) monitors after the reaction finishes, adds 1.2g urea, stirs and cools to 0 ℃, adds potassium iodide solution (130gKI is dissolved in 500g water) rapidly, rises to room temperature, stirs to Continue to stir for 30 minutes without bubbles, filter, wash with 200g of water to obtain a brown solid; dissolve the solid with 400g of ethyl acetate, wash with 300ml of 1N hydrochloric acid, 300ml of 10% sodium bisulfate, and 400ml of saturated brine, dry over magnesium sulfate, and reduce pressure at 50°C Dry to obtain the crude product, add 400ml of toluene at 80°C for beating for 1 hour, cool down at 0-5°C for crystallization for 1 hour, suction filter and dry at 50°C under reduced pre...

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Abstract

The invention discloses a preparation method for 2-chloro-5-iodobenzoic acid. The preparation method is characterized in that cheap o-chlorobenzoic acid is taken as a starting material to obtain 2-chloro-5-iodobenzoic acid through nitration, reduction and diazotization iodination. The method shortens reaction steps, increases the yield and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of 2-chloro-5-iodobenzoic acid, which belongs to the technical field of medicine synthesis. Background technique [0002] Diabetes mellitus is a chronic endocrine and metabolic disease caused by insulin deficiency or reduced biological effects, mainly manifested as hyperglycemia and microvascular complications. With the increasing incidence, there is a high demand for diabetes drugs that can effectively control the disease for a long time, so that many pharmaceutical companies are committed to the development of new drugs in this field, making great progress in both dosage forms and mechanisms of action of diabetes drugs, among which SGLT- 2 Inhibitors have the characteristics of negative regulation of energy balance, weight loss, and insulin-independent lowering of blood sugar, and have become a hot spot for research and development. [0003] 2-Chloro-5-iodobenzoic acid is the starting material for the sy...

Claims

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Application Information

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IPC IPC(8): C07C51/363C07C63/70
CPCC07C51/363C07C201/08C07C227/04C07C63/70C07C229/60C07C205/58
Inventor 昝金行赵希伟刘茂盛
Owner SHANDONG BOYUAN PHARM CO LTD
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