CN104860980B - It is a kind of to be used to synthesize intermediate of Ezetimibe and its preparation method and application - Google Patents

It is a kind of to be used to synthesize intermediate of Ezetimibe and its preparation method and application Download PDF

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CN104860980B
CN104860980B CN201510198353.1A CN201510198353A CN104860980B CN 104860980 B CN104860980 B CN 104860980B CN 201510198353 A CN201510198353 A CN 201510198353A CN 104860980 B CN104860980 B CN 104860980B
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preparation
reaction
compound
formula
ezetimibe
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CN104860980A (en
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罗煜
丁时澄
瞿旭东
孙传民
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Yikelai Biotechnology Group Co ltd
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Shanghai Yi Ke Lai Biological Medicine Science And Technology Co Ltd
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Abstract

The present invention disclose it is a kind of be used for synthesize intermediate of Ezetimibe and preparation method thereof.The intermediate has the structure as shown in formula III, and synthesis is generated chiral hydroxyl group compound through asymmetric reduction reaction in the case where aldehyde ketone restores enzyme catalysis, then obtained product through ring-closure reaction using enzymology method, raw material compound.The intermediate is used to prepare Ezetimibe, simple for process, and products therefrom concentration is high, and have the advantages that product optical purity is high, reaction condition is mild, it is environmentally friendly, easy to operate, be easy to industry amplification, with good prospects for commercial application.

Description

It is a kind of to be used to synthesize intermediate of Ezetimibe and its preparation method and application
Technical field
The invention belongs to organic chemistry fileds, and in particular to a kind of intermediate and its preparation side for being used to synthesize Ezetimibe Method and application.
Background technology
Ezetimibe is a breakthrough in blood lipid-lowering medicine research, and U.S. FDA approval was obtained in 2002, into For from after statins, the first lipid-regulation medicine with complete innovation effect mechanism.The medicine is by inhibiting food and bile In cholesterol and phytosterol in the absorption of intestinal brush border, reduce transhipment of the cholesterol from enteron aisle to liver, reduce liver The storage capacity of middle cholesterol increases the removing of Blood Cholesterol, so as to reduce blood plasma cholesterol level.Cut-off 2011, according to The original of Ezetimibe grinds folk prescription tablet and composite tablet and obtains SFDA approvals respectively, in Discussion on Chinese Listed.The structural formula of Ezetimibe It is as follows:
About Ezetimibe synthesis it has been reported that by starting material, synthesis step or intermediate difference, these There are mainly four types of synthetic methods, including:
Route one:
A kind of synthetic method is provided in patent US5767115:With glutaric anhydride in CH3The lower open loop of OH effects obtains mono-methyl Compound, then chloride compounds are obtained after chloride, compound is then recrystallized to obtain after amidation, in DIPEA, TiCl4Condition Lower and imines cyclization, then through hydrolysis, chloride and bromine 4- fluorophenyl magnesium in ZnCl2、Pd(PPh3)4Effect it is lower (3S, 4R)-interior Amide ring finally uses (R)-MeCBS/BH3Reduction, palladium carbon hydrogenation debenzylation protect to obtain Ezetimibe.Specific route is as follows:
For this method using the grignard reaction synthesis key intermediate of condition harshness, yield is relatively low, needs to use column chromatography Purifying, and synthetic route is relatively complicated, needs using four expensive triphenyl phosphorus palladium catalysts.
Similar approach is also used in relation to document and patent US5919672, difference lies in allow it after synthesis chloride compounds Optical isomerism mixture is obtained by the reaction with group with imine moiety, it is chiral to split (3R, 4S)-lactam nucleus.Route is as follows:
Although the method reduces step, but need to obtain the intermediate with optical purity using chiral resolution, bright Aobvious unsuitable industrialized production.
Route two:
In patent US5856473, use using 5- (4- fluorophenyls) -4- penetenoic acids as raw material and key intermediate, through four steps Reaction structure has the compound there are two chiral centre, then obtains Ezetimibe in the hydroxyl of one S configuration of benzyl position introducing, entirely Seven step of synthetic route, total recovery 16% or so.Route is as follows:
Patent WO2010012775 also uses similar route, the difference is that being made with triphenylphosphine and 4- bromobutyrates Wittig reagents are reacted with 4- fluobenzoic acids, mainly generate (Z) -5- (4- fluorophenyls) amyl- obtusilic acid.
Patent WO9716424 also when only synthesizing (3R, 4S)-lactam nucleus is acted in LDA/THF using similar route Under be condensed to yield enantiomeric mixture.Through isolated (3R, the 4S)-lactam nucleus of chromatographic column, then with upper same procedure Obtain Ezetimibe.The shortcomings that chiral resolution is needed to be the method, and prepare wherein (3R, 4S)-lactam nucleus when, reaction need It is carried out at -76 DEG C to -78 DEG C.
This route raw material is expensive, route is long, complex process and operation are relatively difficult, and chirality is difficult to control.
Route three:
It is anti-to carry out Fu Ke mainly using fluorobenzene and glutaric anhydride as raw material under the action of lewis acid by patent US6207822 Compound 4 should be obtained, amidation obtains compound 17, and compound 17 is carried out in the presence of (R)-methyl-CBS- oxazaborolidines Chiral reduction reacts, prepare compound 18, while the compound 18 protected and the group with imine moiety of protection, via Mannich idols Reaction generation compound 19 is closed, compound 19 is with tetrabutyl ammonium fluoride and the bis- trimethyl silicane alkyl acetamide reaction generations of N, O- according to folding Mai Bu, route are as follows:
4US6207822, WO2007120824, WO2010071358 etc. also employ similar route, and difference is the introduction of Different ketal protections and hydroxylation reagent, and the sequencing of chiral reduction has narrow difference.
Route four:
Patent US5886171 and WO9745406 is with (4S)-hydroxyl tetrahydrofuran -2- ketone and N- (4- fluorophenyls) -4- benzyloxies Base benzene methylene amine is starting material, under cryogenic, (3R, 4S)-amide is obtained with LDA cyclizations.Entire building-up process Totally seven step, total recovery is 20%.Synthetic route is as follows:
The deficiency of this route be repeatedly to be related in building-up process metallic compound Li, LDA to air-sensitive, TiCl4Deng use and -78 DEG C of low-temp reaction, and using the reaction of catalytic hydrogenation ethylene linkage under Pd/C high pressures, grasped in technique Make complexity, and severe reaction conditions.
From the existing route of synthesis Ezetimibe as can be seen that the structure of chiral hydroxyl group and lactam structure be synthesis according to The committed step of Ezetimibe, and these routes are in the prevalence of complex process, of high cost, the bad, prospects for commercial application of selectivity Low defect.To solve problem in the prior art, the technical barrier of external drugmaker is captured, urgent need finds a work The synthetic route that skill is simple, of low cost, selectivity is good, is easy to efficiently separate and is suitble to scale industrial production.
Invention content
The present invention is intended to provide it is a kind of for synthesizing the intermediate of Ezetimibe, there is the structure as shown in formula III, i.e., (S) -1- (4- fluorophenyls) -4- (4- substituted-phenyls)-nitrogen heterocyclic din-2-ketone.The intermediate is synthesized using enzyme-chemical method, former Expect that compound generates chiral hydroxyl group compound in the case where aldehyde ketone restores enzyme catalysis through asymmetric reduction reaction, it is then anti-through cyclization It should obtain product.The intermediate passes through two-step process, you can Ezetimibe is made, step is few, simple for process, high income.
Specifically, the purpose of the present invention is realized by the following aspects.
The first aspect of the invention is to provide a kind of intermediate for being used to synthesize Ezetimibe, has such as formula III institute The chemical constitution shown:
Wherein, R is hydroxyl protection base, preferably silicon ether protecting group (such as TMS, TBDPS, TBDMS, TIPS), acetyl group, Benzoyl, benzyl, MOM, C1-C4Alkyl, THP etc..
The second aspect of the invention is to provide the preparation method of intermediate shown in above-mentioned formula III, includes the following steps:
A) in the case where aldehyde ketone restores enzyme catalysis, asymmetric reduction reaction, production IV compounds occur for Formula V compound;
B) with bromide reagent bromo-reaction occurs for formula IV compound in organic solvent, then under weak base effect and to fluorine Aniline reaction obtains formula III compound;
Reaction equation is as follows:
Wherein, R is hydroxyl protection base, preferably silicon ether protecting group (such as TMS, TBDPS, TBDMS, TIPS), acetyl group, Benzoyl, benzyl, MOM, C1-C4Alkyl, THP etc.;R ' is ester residue, such as alkyl, preferably C1-C4Alkyl.
The reaction of step a) carries out in the aqueous solution of pH value 5.0-8.0.Wherein, the Formula V compound is in reactant Preferred concentration in system is 10-1000g/L.Aldehyde ketone restores enzyme dosage as catalytically effective amount, preferably 1-20g/L.
Preferably, isopropanol or the group containing NADP+, glucose and glucose dehydrogenase are also contained in reaction system It closes.The dosage of isopropanol is the 2%-10% of reaction system volume.Glucose dosage is preferably 1-20g/L, glucose dehydrogenase Dosage be preferably 100-1000U/L, the dosage of NADP+ is catalytic amount, preferably 0.02-0.1mmol/L.
The aldehyde ketone reductase is that application No. is 201410706195.1 Chinese patent application (referred to as " citation Shens Please ", it is the same below) disclosed in aldehyde ketone reductase, herein by the full text of this application introduce using as supplement and reference.The aldehyde The SEQ ID NO of the amino acid sequence of ketoreductase such as the application:(the SEQ ID NO i.e. in citation application shown in 1:4).
It is easily understood that the recombination aldehyde ketone reductase or catalyst in being applied using citation are to substitute aldehyde ketone reductase When, it can equally obtain formula III intermediate through the above method.It is included into the understanding scope of aldehyde ketone reductase in this together.
In step b), the organic solvent is with dissolution type IV compounds and para-fluoroaniline but can be not involved in chemically reacting Those solvents, such as can be dimethylbenzene, toluene, dichloromethane, tetrahydrofuran etc..It is normal that this field may be used in bromo-reaction Bromo-reaction condition, wherein bromide reagent are preferably phosphorus tribromide, phosphorus pentabromide, carbon tetrabromide etc..The weak base can Selected from ethylenediamine, diisopropyl ethyl amine, N-methylmorpholine, to dimethylaminopyridine, triethylamine etc..
Preferably, formula IV compound and the molar ratio of bromide reagent are 1:1-3;Mole of formula IV compound and para-fluoroaniline Than being 1:1-3;The molar ratio of weak base and para-fluoroaniline is 1:2-6.
The third aspect of the invention is to provide a kind of method for preparing Ezetimibe using above-mentioned formula III compound, packet Include the following steps:
A) formula III compound is reacted with Formula IV compound under alkali effect, production II compounds;
B) Formula II compound eliminating hydroxide protecting group generates Ezetimibe;
Reaction equation is as follows:
Wherein, R and R " is hydroxyl protection base, can preferably be selected from each independently silicon ether protecting group (such as TMS, TBDPS, TBDMS, TIPS etc.), acetyl group, benzoyl, benzyl, MOM, C1-C4Alkyl, THP etc..
In step a), formula III compound represented is dissolved in organic solvent, with Formula IV compound under alkali effect, in 60- Production II compounds are reacted at 180 DEG C.The organic solvent is with dissolution type III and VI compound and can be not involved in reacting Solvent, such as can be DMSO, toluene, tetrahydrofuran etc..The alkali preferably is selected from NaH, LDA, n-BuLi etc..
In the reaction system of step a), the molar ratio of the formula III compound and Formula IV compound is preferably 1:1-3; The formula III compound and the molar ratio of alkali are preferably 1:1-3.
In step b), Formula II compound eliminating hydroxide protecting group preferably carries out in acid condition, such as in lewis acid or It is hydrolyzed under the conditions of Bronsted acid, such as trifluoroacetic acid, hydrochloric acid, sulfuric acid etc..
The raw materials and reagents used in the present invention are commercially available or can be by existing known synthetic method easily It is prepared.
The positive effect of the present invention is:For the deficiency in existing Ezetimibe synthesis technology (especially not The defects of energy industrialization), the present invention provides a kind of for synthesizing new intermediate of Ezetimibe and preparation method thereof.Utilize this New intermediate synthesizes Ezetimibe, and products therefrom concentration is high, and with product optical purity is high, reaction condition is mild, to ring Border is friendly, it is easy to operate, be easy to the advantages of industry amplification, therefore with good prospects for commercial application.
Specific embodiment
The present invention is further described, but the present invention is not intended to be limited thereto with reference to embodiment.The following example In the experimental procedures of actual conditions is not specified, carry out usually according to normal condition or according to the normal condition proposed by manufacturer.
(protein concentration of aldehyde ketone reductase is the aldehyde ketone reductase freeze-dried powder and crude enzyme liquid used in embodiment in crude enzyme liquid 10-15mg/mL) it is prepared with reference to the method that specification embodiment 3 is recorded in citation application, the aldehyde ketone reductase Amino acid sequence such as the application SEQ ID NO:Shown in 1.
TLC conditions:EA:PE=1:3, the colour developing of iodine cylinder.
E.e. it is worth determination condition:Using equipped with Chiralpak IA columns (4.6 × 150mm:Second/heptane 90:10, flow velocity 1.5mL/min;40 DEG C of column temperature) 1100 liquid chromatograies of Agilent determine product configuration.
D.e. it is worth determination condition:Using equipped with Chiralpak IA columns (4.6 × 150mm:Second/heptane 90:10, flow velocity 1.5mL/min;40 DEG C of column temperature) 1100 liquid chromatograies of Agilent determine product configuration.
The synthesis of formula IV compound
Embodiment 1
Under stirring, by 20g substratesIt is added in the reaction solution containing following component: 700mL water, aldehyde ketone reductase freeze-dried powder 2g, glucose 7g and glucose dehydrogenase 500U (being purchased from sigma) and 0.1mM NADP+ is stirred to react at 30 DEG C 16 hours, during which using the NaOH aqueous solution control system pH value of 1M between 6.5-7.5, TLC detects reaction process.
After reaction, pH value is adjusted to be extracted 3 times with isometric ethyl acetate to about 9.0, merge organic phase, anhydrous slufuric acid Sodium is dried, and decompression is spin-dried for solvent and obtains product 18.5g, yield 91.8%, purity 97.0%.
Product structure is confirmed by nuclear magnetic resonance spectroscopy, electrospray ionization mass spectrometry and e.e. values measure.
1H NMR(300MHz,CDCl3):δ6.66-7.02(4H,m,Ar-H),5.14(1H,t,-CHOH),3.67(3H, s,-OCH3),2.61-2.86(2H,d,-CH2CO2CH3),2.0(1H,s,-OH),0.08(9H,s,-Si(CH3)3).
MS(ESI)m/z:(M+H)=269.1.
Product retention time:R- types, 5.3min, S- types, 7.2min, e.e. values>99%.
Embodiment 2-4
With reference to the method for embodiment 1, using the substrate listed in table 1, embodiment 2-4 is carried out.
As a result as shown in table 1.
Table 1
Embodiment 5
Under stirring, by 20g substratesIt is added in the reaction solution containing following component: The isopropanol of 700mL water, 200mL crude enzyme liquids and 20mL is stirred to react 16 hours at 30 DEG C, during which with the water-soluble hydraulic controls of the NaOH of 1M System pH processed is between 6.5-7.5, TLC detection reaction process.
After reaction, pH value is adjusted to be extracted 3 times with isometric ethyl acetate to 9.0, merge organic phase, anhydrous sodium sulfate Dry, decompression is spin-dried for solvent and obtains product 18.3g, yield 90.8%, purity 96.9%.
Product structure is confirmed by nuclear magnetic resonance spectroscopy, electrospray ionization mass spectrometry and e.e. values measure.
1H NMR(300MHz,CDCl3):δ6.66-7.02(4H,m,Ar-H),5.14(1H,t,-CHOH),3.67(3H, s,-OCH3),2.61-2.86(2H,d,-CH2CO2CH3),2.0(1H,s,-OH),0.08(9H,s,-Si(CH3)3).
MS(ESI)m/z:(M+H)=269.1.
Chiral purity is detected with embodiment 1, e.e. values>99%.
Embodiment 6-8
With reference to the method for embodiment 5, using the substrate listed in table 2, embodiment 6-8 is carried out.
As a result as shown in table 2.
Table 2
The synthesis of formula III compound
Embodiment 9
4 compound of formula (2.68g) is dissolved in 20mL dimethylbenzene, addition phosphorus tribromide (1.1mL), back flow reaction 5h, so Use 20mL saturated sodium bicarbonate aqueous solutions and water washing successively afterwards, filtrate is dried with anhydrous sodium sulfate, filters.
Triethylamine (2.1mL) and para-fluoroaniline (1.1g) are added in filtrate, reaction 6h is stirred at room temperature, is then heated to 90 DEG C air-distillation, TLC monitoring reaction process.
After reaction, reaction solution is washed with water once, anhydrous sodium sulfate drying, filtering, and filtrate decompression concentration removes molten Agent obtains 3 compound 2.84g of formula, yield 86.5%.
Product structure is confirmed by nuclear magnetic resonance spectroscopy, electrospray ionization mass spectrometry and e.e. values measure.
1H NMR(300MHz,CDCl3):δ7.02-7.08(4H,s,Ar-H),6.68-6.95(4H,s,Ar-H),4.85 (1H,t,ArCHN-),3.24-3.49(2H,d,-CH2CO-),0.08(9H,s,-Si(CH3)3).
MS(ESI)m/z:(M+H)=330.1.
Product retention time:R- types, 6.4min, S- types, 7.9min, e.e. values>95%.
Embodiment 10-12
With reference to the method for embodiment 9, using the substrate listed in table 3, embodiment 10-12 is carried out.
As a result as shown in table 3.
Table 3
Embodiment 13The synthesis of Ezetimibe
Step a)
3 compound of formula (6.58g) is dissolved in 40mL DMSO, 6 compound of formula (5.72g) and LDA (3.3g) is added in, stirs It mixes and is heated to 120 DEG C of back flow reaction 48h, cooled and filtered removes solid salt, and filtrate decompression is concentrated to give 2 compound of formula 8.82g, yield 79.8%.
The structure of 2 compound of formula is confirmed by nuclear magnetic resonance spectroscopy, electrospray ionization mass spectrometry and d.e. values measure, table It is as follows to levy result.
1H NMR(300MHz,CDCl3):δ6.90-7.17(4H,s,Ar-H),7.02-7.08(4H,s,Ar-H),6.68- 6.95(4H,s,Ar-H),4.84(1H,d,ArCHN-),4.50(1H,t,-CHOSiMe3),3.45(1H,d,-COCH-),1.77 (2H,t,Me3SiOCHCH2-),1.63(2H,t,-COCHCH2-),0.08(18H,s,OSi(CH3)3).
MS(ESI)m/z:(M+H)=554.2.
Product chirality HPLC retention times:R- types, 9.6min, S- types, 10.9min, d.e. values>90%.Step b)
Compound 2 (5.53g) is dissolved in 50mL dichloromethane, trifluoroacetic acid (0.07mL) is added in, reaction is stirred at room temperature 5h, TLC monitor reaction process.It after the reaction was complete, is concentrated under reduced pressure and removes solvent, ethyl alcohol recrystallization obtains 1 compound of formula i.e. according to folding Wheat cloth 3.58g, yield 87.5%.
Ezetimibe structure is confirmed by nuclear magnetic resonance spectroscopy, electrospray ionization mass spectrometry and d.e. values measure, is characterized As a result it is as follows.
1H NMR(300MHz,CDCl3):δ6.90-7.17(4H,m,Ar-H),7.02-7.08(4H,m,Ar-H),6.68- 6.95(4H,m,Ar-H),5.0(1H,s,Ar-OH),4.84(1H,d,-CH-),4.50(1H,t,-CHOH),3.45(1H,dt,- CH-),1.77(2H,dt,-CH2-),1.63(2H,dt,-CH2-).
MS(ESI)m/z:(M+H)=410.2.
Product chirality HPLC retention times:R- types, 9.6min, S- types, 10.9min, d.e. values>95%.

Claims (11)

1. the preparation method of Ezetimibe intermediate, includes the following steps shown in a kind of formula III:
A) in the case where aldehyde ketone restores enzyme catalysis, asymmetric reduction reaction, production IV compounds occur for Formula V compound;
B) formula IV compound in organic solvent with bromide reagent occur bromo-reaction, then weak base effect under with para-fluoroaniline Formula III compound is obtained by the reaction;
Reaction equation is as follows:
Wherein, R is hydroxyl protection base, and R ' is ester residue;
Wherein, aldehyde ketone reductase has SEQ ID NO:Amino acid sequence shown in 1.
2. preparation method according to claim 1, it is characterised in that:R be selected from silicon ether protecting group, acetyl group, benzoyl, Benzyl, MOM, C1-C4Alkyl, THP.
3. preparation method according to claim 1, it is characterised in that:R ' is C1-C4Alkyl.
4. preparation method according to claim 1, it is characterised in that:The reaction of step a) is the water in pH value 5.0-8.0 It is carried out in solution.
5. according to the preparation method described in any one of claim 1-4, it is characterised in that:In step a), the Formula V chemical combination A concentration of 10-1000g/L of object in the reaction system, aldehyde ketone reduction enzyme dosage is 1-20g/L.
6. preparation method according to claim 1, it is characterised in that:Also contain isopropanol in the reaction system of step a), Or the combination containing NADP+, glucose and glucose dehydrogenase.
7. preparation method according to claim 6, it is characterised in that:The dosage of isopropanol is the 2%- of reaction system volume 10%.
8. preparation method according to claim 6, it is characterised in that:Glucose dosage be 1-20g/L, glucose dehydrogenase Dosage for 100-1000U/L, the dosage of NADP+ is 0.02-0.1mmol/L.
9. preparation method according to claim 1, it is characterised in that:The bromide reagent is selected from phosphorus tribromide, pentabromo- Change phosphorus, carbon tetrabromide.
10. preparation method according to claim 1, it is characterised in that:The weak base is selected from ethylenediamine, diisopropyl second Base amine, N-methylmorpholine, to dimethylaminopyridine, triethylamine.
11. preparation method according to claim 1, it is characterised in that:In step b), formula IV compound and bromide reagent Molar ratio is 1:The molar ratio of 1-3, formula IV compound and para-fluoroaniline is 1:The molar ratio of 1-3, weak base and para-fluoroaniline is 1:2-6。
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CN107022587A (en) * 2017-04-27 2017-08-08 江苏理工学院 A kind of method that enzyme law catalysis synthesizes Ezetimibe intermediate
CN111458440B (en) * 2020-05-13 2022-08-23 北京阳光德美医药科技有限公司 Method for detecting free ezetimibe and total ezetimibe in plasma by liquid chromatography-tandem quadrupole mass spectrometry
CN114349710A (en) * 2021-12-31 2022-04-15 南京望知星医药科技有限公司 Synthetic method of ezetimibe impurities

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