Method for preparing Rosuvastain and its intermediate

A technology of rosuvastatin and asana, which is applied in a new field of preparation, can solve the problems of difficulty, high cost, and low yield in the synthesis of phosphonate esters, and achieve the goals of high product quality, increased yield, and increased overall yield. Effect

Active Publication Date: 2005-10-26
ZHEJIANG HISUN PHARMA CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0005] The inventor found through research on the synthesis method of rosuvastatin: the phosphine ester obtained according to the patented method is not only difficult to synthesize, and the cost is high, but also uses toxic and polluting raw materials such as trimethyl phosphite; In addition, the yield of condensation using this method is low, and the yield reported in the literature is only about 60-70%.

Method used

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  • Method for preparing Rosuvastain and its intermediate
  • Method for preparing Rosuvastain and its intermediate
  • Method for preparing Rosuvastain and its intermediate

Examples

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Effect test

Embodiment 1

[0022] Example 1: Synthesis of 4-(4-fluorophenyl)-6-isopropyl-2-(N-methyl-N-methylsulfonyl-amino)-pyrimidin-5-yl-bromomethane ( Preparation of compound (2))

[0023] In a 2-liter four-necked flask, 143.3 g of compound (1) (see EP0521471A for its preparation method) was put in, 780 ml of dichloromethane was added and stirred to dissolve, and 780 ml of toluene was added. Stir for another 10 minutes. 63ml of phosphorus tribromide was added dropwise, and the temperature was controlled at <0°C. After the dropwise addition was completed, the reaction was kept at 0°C for 3 hours. The reaction solution was poured into the prepared 1200ml saturated sodium bicarbonate solution, stirred for 10 minutes, allowed to stand to separate layers, and the organic layer was extracted. Wash once with 350ml of water, add 180g of anhydrous magnesium sulfate to dry for more than 5 hours, filter, concentrate under reduced pressure, add 300ml of n-hexane, stir and crystallize at room temperature, filt...

Embodiment 2

[0024] Example 2: 4-(4-fluorophenyl)-6-isopropyl-2-(N-methyl-N-methylsulfonyl-amino)-pyrimidin-5-yl-bromomethanetriphenyl Preparation of Phosphonium Salt (Preparation of Compound (3))

[0025] Reaction at room temperature, 261.8g of compound (2) was dissolved in 1730ml of toluene. Slowly add 420 ml of toluene solution containing 130 g of triphenylphosphine dropwise at room temperature, complete the addition in about 5 hours, and stir overnight. After centrifugal filtration, the solid was slurried once with 760ml of toluene, centrifugally filtered, and dried to obtain 284.4g of white solid (compound (3)), with a yield of 81%.

Embodiment 3

[0026] Example 3: (E)-4-(4-fluorophenyl)-6-isopropyl-2-(N-methyl-N-methylsulfonyl-amino)-pyrimidin-5-yl-( Preparation of 3R, 5S)-2,2-dimethyl-1,3-dioxolane-4-acetic acid tert-butyl ester (preparation of compound (5))

[0027] In a 500ml four-neck flask, add 50g of compound (3), 18.5g of side chain aldehyde (4) (prepared according to the method of Example 6 of US4970313A), 400ml of tetrahydrofuran, heat to 70°C, and stir to dissolve. Heating was stopped, and 2.75 g of 60% sodium hydride was added. After stirring for 15 minutes, the reaction solution was poured into ice water to terminate the reaction. Add 950ml of ethyl acetate to extract the organic layer, wash twice with 200ml of water, add 70g of anhydrous sodium sulfate and dry for more than 5 hours. Filter and concentrate to dryness under reduced pressure. Add 480ml of ethanol and cool to -5°C for crystallization for 6 hours. Filter and drain to obtain the crude product, which is dissolved and recrystallized by heating...

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Abstract

The present invention relates to a preparation method of medicine for reducing blood-lipid-Reshufatadine compound. Said method uses side chain aldehyde compound and triphenyl phosphorus ylide reagent compound and makes them undergo the condensation reaction so as to obtain Reshufatadine compound with high yield. Said invention also provides its key intermediate compound.

Description

field of invention [0001] The invention relates to the field of organic chemistry, in particular to a new preparation method of rosuvastatin and its intermediates. Background technique [0002] Rosuvastatin (ROSUVASTATIN) is a new type of HMG-CoA reductase inhibitor, which can effectively reduce blood lipids. Because it has the advantages of high efficiency and low toxicity, it is favored by people, so this drug has a wide range of applications. Prospects. [0003] The compound and its preparation method are disclosed in European patent EP0521471A. The preparation method is characterized in that the pyrimidine core is used to obtain multi-substituted formaldehyde, in addition, the chiral side chain is synthesized into a phosphine ester, and then the rosuvastatin skeleton is obtained through Wittig reaction condensation. Its key synthetic steps are as follows: [0004] [0005] The inventors found by studying the synthesis method of rosuvastatin: the phosphine ester obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6512
Inventor 梅光耀蔡青峰
Owner ZHEJIANG HISUN PHARMA CO LTD
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