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A kind of preparation method of rivaroxaban intermediate

A technology for rivaroxaban and intermediates, which is applied in the synthesis field of pharmaceutical intermediates, can solve the problems of difficult control of reaction conditions, complicated purification steps and the like, and achieves the effects of low production cost, high product yield and simple steps.

Active Publication Date: 2015-10-14
广东暨大基因药物工程研究中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The purpose of the present invention is to provide a safe, efficient and suitable preparation method for industrialized production of 4-phenylmorpholin-3-one, so as to solve technical problems such as complicated purification steps and difficult control of reaction conditions in current industrial production

Method used

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  • A kind of preparation method of rivaroxaban intermediate
  • A kind of preparation method of rivaroxaban intermediate
  • A kind of preparation method of rivaroxaban intermediate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Suspend 24.0g (0.3mol) lithium tert-butoxide in 100mL dichloromethane, heat to reflux in a nitrogen atmosphere, add 18.6g (0.2mol) aniline in 100mL dichloromethane solution and 33.3g (0.2mol) 2-(2- Chloroethoxy)ethyl acetate solution in 100mL dichloromethane, after 1h dropwise addition, continue to reflux for 24h, add 100mL 5% dilute hydrochloric acid aqueous solution and stir for 10min, separate the water layer, and extract the water layer with 150mL dichloromethane. Combine the organic phases, wash with water (100mL×2), and anhydrous Na 2 SO 4 After drying, the solvent was removed under reduced pressure to obtain 32.1 g of white solid, yield 90.6%, m.p.113.5-114.5°C.

[0036] 1 H-NMR (CDCl 3 , 500MHz) δ: 3.77(2H,t,J=5.2Hz),4.04(2H,t,J=5.2Hz),4.35(1H,s),7.27(3H,m),7.42(2H,t,J =8.0Hz)

Embodiment 2

[0038] Suspend 3.4g (30.3mmol) of potassium tert-butoxide in 10mL of tetrahydrofuran, heat to reflux in a nitrogen atmosphere, add 1.9g (20.4mmol) of aniline in 10mL of tetrahydrofuran and 3.11g (0.02mol) of 2-(2-chloroethoxy ) 10mL tetrahydrofuran solution of methyl acetate, after 1h was added dropwise, the reflux reaction was continued for 24h. After the reaction was complete, the solvent was removed under reduced pressure. Add 10mL of 5% dilute sulfuric acid aqueous solution and stir for 10min, then extract with dichloromethane (15mL×3). The organic phases were combined, washed with water (10 mL×2), dried over anhydrous Na2SO4, and the solvent was removed under reduced pressure to obtain 3.0 g of white solid, yield 84.7%, m.p.113-114.5°C.

Embodiment 3

[0040] 2.9g (30.2mmol) sodium tert-butoxide was suspended in 10mL dichloromethane, heated to reflux in a nitrogen atmosphere, 1.9g (20.4mmol) aniline in 10mL dichloromethane solution and 3.40g (20.4mmol) 2-(2- Chloroethoxy)ethyl acetate solution in 10 mL dichloromethane, after 1 hour of dropwise addition, continue to reflux for 12 hours, add 10 mL of water and stir for 10 minutes, separate the water layer, and extract the water layer with 15 mL of dichloromethane. The organic phases were combined, dried over anhydrous Na2SO4, and dichloromethane was removed under reduced pressure to obtain 2.3 g of a white solid with a yield of 63.6%. m.p.113-114.5°C.

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Abstract

The invention provides a method for efficiently preparing a key rivaroxaban intermediate, namely, 4-phenylmorpholine-3-ketone, by the one-step process through aniline and halogen ethyl acetate, aiming at solving the technical problems that the conventional synthesis method of 4-phenylmorpholine-3-ketone has a plurality of steps, rigorous requirements on reaction condition, low yield, and complex and complicated product purification. The preparation method has the advantages that the reaction conditions are mild, the yield is high, and industrial production can be carried out. The reaction formula is shown as the description.

Description

technical field [0001] The invention relates to a method for synthesizing medicines, in particular to a method for synthesizing medicine intermediates. Background technique [0002] The scientific name of rivaroxaban is 5-chloro-N-[(5S)-2-oxo-3-[4-(3-oxo-4-morpholinone)phenyl]-1,3-oxazole Alkyl-5-base]-2-thiophenecarboxamide, its structural formula is as follows: [0003] [0004] Rivaroxaban is a new coagulation factor Xa inhibitor, which was approved by the European Union in 2008 and is widely used in the prevention and treatment of thrombotic diseases. [0005] 4-(4-Aminophenyl)-morpholin-3-one (formula II) is the key intermediate of rivaroxaban, and currently all routes for synthesizing rivaroxaban use the compound of formula II as the reaction intermediate, And the industrial production of the latter must be raw material with 4-phenylmorpholin-3-one (formula III). [0006] [0007] WO01 / 47919 discloses a method for preparing 4-phenylmorpholin-3-one for the firs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D265/32
CPCC07D265/32
Inventor 张庆华徐广宇唐博周希杰陈波
Owner 广东暨大基因药物工程研究中心有限公司
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