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Method for preparing rosuvastatin calcium intermediate containing brooethyl, hydroxymethyl or formyl

A technology for the reaction of methylguanidine hydrochloride and methanesulfonyl chloride, which is applied in the field of medicine and chemical industry, can solve the problems of high toxicity, high production cost, and high price, and achieve the effects of mild reaction conditions, high yield, and cheap reagents

Inactive Publication Date: 2013-02-20
JIANGSU ALPHA PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The reagent DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) required for the synthetic method disclosed in the above patent is very toxic; TPAP (tetra-n-propylperruthenium(VII) ammonium acid) and DIBAL-H (diisobutylaluminum hydride) are expensive; DIBAL-H reduction needs to be reacted at low temperature, and the production cost is high, which is not conducive to industrial production; the reaction yield is not high

Method used

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  • Method for preparing rosuvastatin calcium intermediate containing brooethyl, hydroxymethyl or formyl
  • Method for preparing rosuvastatin calcium intermediate containing brooethyl, hydroxymethyl or formyl
  • Method for preparing rosuvastatin calcium intermediate containing brooethyl, hydroxymethyl or formyl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Synthesis of 1-(4-fluorophenyl)-4-methylpentane-1,3-dione (Compound V)

[0034]

[0035]Under nitrogen protection, add 12.18g (0.3mol) of sodium hydride and 150mL of 1,4-dioxane into a 500mL three-necked flask, and add dropwise 13.81g (0.1mol) of p-fluoroacetophenone and isobutyl A solution of 11.62g (0.1mol) of ethyl acetate dissolved in 100mL of 1,4-dioxane. The reaction solution was stirred at 85°C for 6h, then cooled to room temperature, poured into 400mL glacial hydrochloric acid (2M), and stirred. Extract with 250 mL of ethyl acetate, wash with 100 mL of water and 100 mL of brine in turn, and dry over anhydrous magnesium sulfate. Filtrate, the filtrate is concentrated, and finally obtain liquid V through vacuum distillation, productive rate 85%, nuclear magnetic data ( 1 HNMR, 500MHz, internal standard TMS, solvent CDCl 3 ) as follows: δppm 7.93-7.87 (m, 2H, Ar-H), 7.18-7.12 (m, 2H, Ar-H), 4.15 (s, 1H, CH 2 ),2.61(m,1H,CH of i Pr),1.32(d,J=7.0Hz...

Embodiment 2

[0036] Example 2: Synthesis of 1-(4-fluorophenyl)-2,4-dimethylpentane-1,3-dione (compound IV)

[0037]

[0038] Under the protection of nitrogen, 6.25g (30mmol) of compound (V), 4.14g (30mmol) of potassium carbonate, 2.85mL of methyl iodide (45mmol) and 15mL of acetone were successively added into a 100mL three-necked flask, and the reaction was stirred at room temperature for 48h. Add 10 mL of n-heptane to the reaction solution, filter out the solid, and wash with 20 mL of acetone / n-heptane (1:1). The organic layers were combined, the solvent was evaporated under reduced pressure, and the residue was dissolved in 10 mL of ethyl acetate. The solution was washed successively with 12mL hydrochloric acid (2M), 10mL saturated sodium bicarbonate solution, 20mL water and 10mL brine, and dried over anhydrous magnesium sulfate. Filtration, decompression evaporates solvent and obtains white solid IV, productive rate 96%, fusing point is 44-45 ℃, nuclear magnetic data ( 1 HNMR, 500...

Embodiment 3

[0039] Example 3: Synthesis of 4-(4-fluorophenyl)-6-isopropyl-N,5-dimethylpyrimidin-2-amine (compound III)

[0040]

[0041] A solution of 2.00 g (9.0 mmol) of compound (IV), 0.98 g (9.0 mmol) of methylguanidine hydrochloride and 5.86 g (18.0 mmol) of cesium carbonate dissolved in 20 mL of 2-methyltetrahydrofuran was sequentially added to a 100 mL three-necked flask. The mixture was stirred at 70°C for 24h. After cooling to room temperature, 20 mL of water was added, and the layers were separated. The aqueous layer was extracted with 20 mL of 2-methyltetrahydrofuran, washed with 20 mL of brine, and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, the residue was washed with 40 mL of water / methanol (1:1), filtered, and dried to give yellow solid III with a yield of 93% and a melting point of 140-141°C. The NMR data ( 1 HNMR, 500MHz, internal standard TMS, solvent CDCl 3 ) as follows: δppm 7.52-7.47 (m, 2H, Ar-H), 7.16-7.10 (m, 2...

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Abstract

The invention discloses a method for preparing a rosuvastatin calcium intermediate containing brooethyl, hydroxymethyl or formyl. The method includes enabling fluoro-acetophenone to be reacted with ethyl iso-butyrate to prepare a compound V, enabling the compound V to be reacted with methyl iodide to synthesize a compound as shown in a formula IV, then enabling the compound as shown in the formula IV to be reacted with methylguanidine hydrochloride and cesium carbonate to obtain a compound as shown in a formula III, enabling the compound as shown in the formula III to be reacted with triethylamine and methylsulfonyl chloride to prepare a compound as shown in a formula II, and finally enabling the compound as shown in the formula II to be reacted with NBS (N-bromosuccinimide) to obtain a compound as shown in a formula I; and then preparing a compound as shown in a formula I-1 and a compound in a formula I-2. Compared with an existing method, the method has the advantages of mild reaction conditions, cheap utilized reagents and high yield.

Description

technical field [0001] The invention belongs to the field of medicine and chemical industry, and specifically relates to a preparation method of a rosuvastatin calcium intermediate containing bromomethyl, hydroxymethyl or formyl groups. Background technique [0002] Rosuvastatin calcium (rosuvastatin calcium), CAS No: 147098-20-2, chemical name: bis-[(E)-7[4-(4-fluorophenyl)-6-isopropyl-2- [Methyl(methylsulfonyl)amino]-pyrimidin-5-yl](3R,5S)-3,5-dihydroxy-6-heptenoic acid] calcium salt (2:1), molecular formula: (C 22 h 27 FN 3 o 6 S) 2 Ca, molecular weight: 1001.15, is a new generation of statin blood lipid regulating drug with a fully synthesized single enantiomer developed by Shionogi Company of Japan. It belongs to aminopyrimidine derivatives, can strongly inhibit HMG-CoA reductase, and has liver cell effects selective. The effect of lowering low-density lipoprotein cholesterol (LDC-C) and raising high-density lipoprotein cholesterol (HDL-C) is the best among the st...

Claims

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Application Information

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IPC IPC(8): C07D239/42
Inventor 尹晓龙刘媛媛徐春涛吉民万新强庞小召
Owner JIANGSU ALPHA PHARM CO LTD
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