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Method for synthesizing optical enantiomer 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid and 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylate

A technology of benzopyran and a synthesis method, applied in directions such as organic chemistry, can solve the problems of high cost of enantiomeric separation, inability to localize raw materials, difficulty in mass production of products, etc.

Inactive Publication Date: 2006-10-11
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] One of the purposes of the present invention is to overcome the unreasonable synthesis method existing in the prior art, the reaction pollution is large, the cost of enantiomer resolution is high, the yield is low, the mass production of the product is difficult, and the raw materials cannot be localized, etc., and provide Two (R)-(-)-6-fluoro-3,4-dihydro-2H-1-benzopyrans, which are mild in reaction conditions, easy to operate, reasonable in sequence and low in synthesis cost, are suitable for industrial mass production. -2-carboxylic acid [where (R)-(-)-1], and (S)-(+)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2- The synthetic method of carboxylic acid [(S)-(+)-1 in the formula]

Method used

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  • Method for synthesizing optical enantiomer 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid and 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylate
  • Method for synthesizing optical enantiomer 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid and 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylate
  • Method for synthesizing optical enantiomer 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid and 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]Example 1. Preparation of (±)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid [wherein (±)-1] and (±) -6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylate [wherein (±)-1b]

[0053] 1.1 p-Fluoroanisole

[0054] Dissolve p-fluorophenol (25.6g, 0.05mol) in 500ml of 5wt% NaOH aqueous solution, add dropwise dimethyl sulfate (32g, 0.254mol), heat to 70°C, stop stirring for 5 hours, and wait for the system to cool to room temperature Finally, extract with ethyl acetate 20ml×3, collect the ethyl acetate layer, dry with anhydrous sodium sulfate, filter, and remove the solvent by rotary evaporation to obtain a light yellow viscous liquid, which is distilled under reduced pressure and collected at 38-40°C / The 5mmHg fraction gave p-fluoroanisole (6.2g, 98%).

[0055] 1.2 4-(5-fluoro-2-hydroxy)phenyl-4-keto-2,3-butenoic acid

[0056] Feed maleic anhydride (4g, 0.04mol), aluminum trichloride catalyst (15g, 0.112mol), p-fluoroanisole (2.5g, 0.02mol), dissolve in 50ml of carbo...

Embodiment 2

[0066] 1.1 p-Fluoroanisole

[0067] Dissolve p-fluorophenol (51.2 g, 0.1 mol) in 5 wt% Na 2 CO 3 Add dimethyl sulfate (64g, 0.508mol) dropwise to 1000ml of aqueous solution, heat to 75°C, stop stirring for 5 hours, after the system is cooled to room temperature, extract with ethyl acetate 40ml×3, collect the ethyl acetate layer, Dry with anhydrous sodium sulfate, filter, and remove the solvent by rotary evaporation to obtain a light yellow viscous liquid, distill under reduced pressure, collect fractions at 38-40°C / 5mmHg to obtain p-fluoroanisole (12.4g, 98%) .

[0068] 1.2 4-(5-fluoro-2-hydroxy)phenyl-4-keto-2,3-butenoic acid

[0069] Feed with maleic anhydride (8g, 0.08mol), catalyst aluminum trichloride (30g, 0.224mol), p-fluoroanisole (5.0g, 0.04mol), dissolve in 55ml of dichloromethane, heat to 60°C, React for 2 hours. After the reaction is completed, add ice water and hydrochloric acid mixture to the reaction system, and vigorously stir. 4-(5-fluoro-2-hydroxy)phenyl...

Embodiment 3

[0079] Prepare (±)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid [wherein (±)-1] and (±)-6-fluoro -3,4-dihydro-2H-1-benzopyran-2-carboxylate [wherein (±)-1b]

[0080] 1.1 p-Fluoroanisole

[0081] The preparation of p-fluoroanisole is the same as in Example 1.

[0082] 1.2 5-fluoro-2-hydroxy-acetophenone

[0083] p-Fluoroanisole (0.1mol), CS 2 100ml, catalyst aluminum trichloride (0.25mol), slowly add acetic anhydride (0.12mol) dropwise under stirring, the reaction temperature is 75°C, after the reaction is finished, add an appropriate amount of hydrochloric acid and crushed ice to the system, stir vigorously, and divide The organic layer was taken out, the aqueous layer was extracted with ethyl acetate (3 × 25ml), the combined organic layers were washed with water, and finally the organic layer was washed with Na 2 SO 4 After drying and removing the solvent, the product 5-fluoro-2-hydroxy-acetophenone was obtained. Mp55~56℃.

[0084] 1.3 (a) 5-fluoro-2-hydroxy-...

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Abstract

The invention provides the method for synthesizing destination substance of (+-)-6-fluoine-3,4-dihydrogen-2H-1-benzopyrans-2-carboxylic acid through two paths, the (+-)-6-fluoine-3,4-dihydrogen-2H-1-benzopyrans-2-carboxylic acid and C1-C10 alcohols are subject to esterification reaction so as to synthesize the corresponding racemic ester. Then chemical dismantling is conducted to (+-)-6-fluoine-3,4-dihydrogen-2H-1-benzopyrans-2-carboxylic acid, in order to obtain prepare optical purity of (R)-(-)-6-fluoine-3,4-dihydrogen-2H-1-benzopyrans-2-carboxylic acid and (S)-(+)-6-fluoine-3,4-dihydrogen-2H-1-benzopyrans-2-carboxylic acid.

Description

technical field [0001] The invention belongs to the field of medicinal chemistry, in particular to optically pure (R)-(-)-6-fluoro-3,4-dihydro-2H-1-benzophenone intermediates of β-adrenal antagonist antihypertensive drugs Pyran-2-carboxylic acid [where (R)-(-)-1] and (S)-(+)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2 -The synthetic method of carboxylic acid [(S)-(+)-1 in the formula] and their racemic carboxylate. Background technique [0002] Optical enantiomers (R)-(-)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid [wherein (R)-(-)-1] and (S)-(+)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid [where (S)-(+)-1] is a drug synthesis The intermediate is mainly used in the synthesis of β-adrenal antagonist antihypertensive drugs. [0003] Regarding (R)-(-)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid [where (R)-(-)-1] and (S) -(+)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid [wherein (S)-(+)-1] and their carboxylic acid ethyl esters Synthesi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D311/66C07D311/20
Inventor 王乃兴杨运旭
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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