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CN104829644B - A kind of preparation method of (S) tertiary butyl dimethyl Si base glutaric acid list benzyl ester monoamides - Google Patents

A kind of preparation method of (S) tertiary butyl dimethyl Si base glutaric acid list benzyl ester monoamides Download PDF

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CN104829644B
CN104829644B CN201510223396.0A CN201510223396A CN104829644B CN 104829644 B CN104829644 B CN 104829644B CN 201510223396 A CN201510223396 A CN 201510223396A CN 104829644 B CN104829644 B CN 104829644B
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benzyl ester
tertiary butyl
acid list
butyl dimethyl
glutaric acid
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CN104829644A (en
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王志华
洪华斌
颜剑波
林义
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Zhejiang Le Pu pharmaceutical Limited by Share Ltd
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XINDONGGANG PHARMACEUTICAL CO Ltd ZHEJIANG
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Abstract

The invention discloses one kind(S)The preparation method of tertiary butyl dimethyl Si base glutaric acid list benzyl ester monoamides, belongs to field of medicaments.This method is with compound(S) butyric ester of 4 cyano group 3 is raw material, believes that lipase 435 is catalyzed with Novi, benzylalcohol ester exchange obtains(S) the hydroxybutyrate benzyl ester of 4 cyano group 3, then combined with TBSCl, obtain TBS protections(S) the tertiary butyl dimethyl Si butyric acid list benzyl ester of 4 cyano group 3, reoxidizes to obtain S) 3 tertiary butyl dimethyl Si base glutaric acid list benzyl ester monoamides.Ester exchange is carried out using NOVO 435 and obtains that benzyl ester is higher than former process recovery ratio, and the three wastes are few, avoids the pollution of titanium tetrachloride.With hydrogen peroxide and alkali or catalysis oxidation acid amides, the three wastes are few, avoid the method for oxidation with manganese dioxide high pollution, avoid the high cost method aoxidized with Wilkinson precious metal catalyst.Make process costs lower, be more easy to industrialize.

Description

A kind of preparation of (S)-tertiary butyl dimethyl Si base-glutaric acid list benzyl ester monoamides Method
Technical field
The present invention is the field of chemical synthesis, and specifically a kind of hypolipidemic HMG inhibitor cuts down statin intermediate (S)-tertiary fourth The preparation method of base dimethylsilyl bis-glutaryl amine mono-methyl.
Background technology
Rosuvastatin (also referred to as Rosuvastatin, English name:rosuvastatin).Rosuvastatin calcium is that Japanese salt is wild Adopted (Osaka Shionogi companies) is developed, and 2 months 1999 I phases that the medicine is completed in the U.S., II phase, III phase clinic are tested Card.In terms of its existing Clinical results and with the comparison two of like product, heavy dose of rosuvastatin calcium (80 millis Gram) LDL can be reduced up to 65%, higher than Atorvastatin and Simvastatin, rosuvastatin calcium, which is deserve to be called, is referred to as " superstatin ", its Lipid-lowering effect is very good, is the most potent fat-reducing medicament listed so far.Coming years rosuvastatin calcium pole has can The market competition structure of current statins can be changed.The product respectively in July, 2002 and in August, 2003 pass through European medicine The product committee and the examination & approval of U.S. FDA, in succession in Europe and U.S.'s listing.
(S)-tertiary butyl dimethyl Si base-glutaryl amine list benzyl ester be easy in WO2013080219 close (R)- Tertiary butyl dimethyl Si base-monomethyl glutarate is further easy to reference to EP0521471, EP0304063, WO03087112 Etc. the side chain important intermediate of patent synthesis statin.
The synthesis compound I reported at present:
Main literature has Enzymatic (2003), 21 (1-2), 55-58.;Tetrahedron Asymmetry,2004, vol.15,#10p.1551-1554;Biotechnology Letters (2012), 34 (5), 901-905 and WO2013080219.Preparation technology be all withFor raw material, fat is believed in Novi Generated under enzyme, or Novi's letter lipase of improvementIn the presence of chiral different Structure body, need to purify.
In WO2013080219 after enzyme process is prepared into the said goods, ethyl ester titanium tetrachloride is become benzyl ester, then upper guarantor Shield, obtains target product.The purpose of ester group conversion is to improve ester hydrolysis into the selectivity of acid.
The content of the invention
The purpose of the present invention is to overcome prior art route to grow, and chiral photo-isomerisation be present, and separation is difficult, be not easy it is industrialized not A kind of foot, there is provided preparation method of (S)-tertiary butyl dimethyl Si base-glutaric acid list benzyl ester monoamides.
Technical scheme is as follows:
The preparation method of one kind (S) -3- tertiary butyl dimethyl Si base glutaric acid list benzyl ester monoamides comprises the following steps:
1) (S) -4- cyanogen -3- hydroxyl protections butyrates (IV) are exchanged into benzyl ester in the presence of solvent, catalyst with benzylalcohol (III);(S) structural formula of -4- cyanogen -3- hydroxyl protections butyrate (IV) is:
Wherein P is H or TBS, R CH3Or C2H5
Compound III structural formula is:
Wherein P is H or TBS;
2) when compound III substituent P is H, compound III is with t butyldimethylsilyl chloride in solvent, imidazoles Reaction generation compound II in the presence of effect;When P is TBS, step 3) is directly carried out;
Compound II structural formula is:
3) using compound II as raw material, oxidation generation (S)-tertiary butyl dimethyl Si base-glutaric acid list benzyl under catalysis Ester monoamides (I);
(S) structural formula of-tertiary butyl dimethyl Si base-glutaric acid list benzyl ester monoamides (I) is:
Solvent in the step 1) is toluene or hexamethylene, and catalyst is Novi's letter 435, compound IV and catalyst Mass ratio is 1:0.1~1:The mol ratio of 0.5, compound IV and benzylalcohol is 1:0.9~1:2.5, compound IV and solvent matter Amount is than being 1:3~1:15, reaction temperature is 50~80 DEG C, and the reaction time is 8~30 hours.
T butyldimethylsilyl chloride in described step 2):Compound III:The mol ratio of imidazoles is 1.0:1:1.0~ 1.8:1:2.2, solvent is dichloromethane or DMF, and solvent and compound III mass ratio are 5:1~20:1, reaction temperature 15 ~30 DEG C, the reaction time is 6~24 hours.
A kind of preparation method of (S)-tertiary butyl dimethyl Si base-glutaric acid monoester monoamides is using compound V as original Material, generation is aoxidized under catalysis,
Compound V structural formula is as follows:
(S) structural formula of-tertiary butyl dimethyl Si base-glutaric acid monoester monoamides is as follows:
Wherein R1For CH3, C2H5, H, benzyl.
The catalyst of oxidation reaction is alkali under described catalysis, and oxidant is hydrogen peroxide;Or catalyst is cupric, oxidation Agent is oxime.
The alkali is Amberlyst A-26 (OH), and cupric is the mixture of copper chloride and 4A molecular sieves composition, oxidation Copper, copper acetate, Kocide SD or copper sulphate, oxidant oxime are acetaldoxime.
Solvent is methanol, ethanol, water or acetone when being oxidant with hydrogen peroxide, compound II or compound V:Solvent matter Amount is than being 1:3~1:20, compound II or compound V:Hydrogen peroxide:The mol ratio of alkali is 1:3:1.5~1:10:3, reaction temperature For 10~60 DEG C, 1~36 hour reaction time.
Solvent is methanol, ethanol, acetone, n-hexane, dichloromethane or toluene when being oxidant with acetaldoxime, compound II or compound V:Solvent quality ratio is 1:2~1:20, compound II or compound V:Acetaldoxime mol ratio is 1:1.5~1:4, Compound II or compound V:Catalyst quality ratio is 1:0.1~1:0.5, copper chloride is 1 with 4A molecular sieves mol ratio:0.5~ 1:2,25~68 DEG C of reaction temperature.Reaction time is 5~16 hours.
The catalyst preparation need to activate 1~5 hour at 100~150 DEG C.
Product removes benzyl by catalytic hydrogenation, and again with methanol sodium and methanol can be easily converted to (R)-tert-butyl group two Methyl siloxy monomethyl glutarate, available for synthesis statin side chain
The present invention obtains that benzyl ester is higher than former process recovery ratio, and the three wastes are few, avoid tetrachloro using NOVO-435 progress ester exchanges Change the pollution of titanium.With hydrogen peroxide and alkali or catalysis oxidation acid amides, the three wastes are few, avoid the method for oxidation with manganese dioxide high pollution, Avoid the high cost method aoxidized with Wilkinson precious metal catalyst.Make process costs lower, be more easy to industrialize
Embodiment
Compound III preparation:
Example 1:
(S) -3- hydroxyls -4- cyano butyric acids methyl esters (IV) 14.3g, benzylalcohol 20g toluene 250ml are dissolved, NOVO-4353g, 60 DEG C are heated to, reduced-pressure backflow 12 hours, constantly removes a small amount of toluene steamed therebetween, is cooled down, filtering, adds water 50ml washings Twice, organic phase is concentrated, the material that decompression boils off low useless point obtains (S) -3- hydroxyl -4- cyano butyric acid benzyl esters, and yield 96.5% is (pure Degree is 92.4%).
Example 2:
By (S) -3- hydroxyls -4- cyano butyric acids ethyl ester (IV) 15.7g, benzylalcohol 20g, hexamethylene 250ml dissolvings, NOVO- 4353g, 80 DEG C are heated to, reduced-pressure backflow 16 hours, constantly removes a small amount of hexamethylene steamed therebetween, cooled down, filtering, add water 50ml is washed twice, and concentrates organic phase, and the material that decompression boils off low useless point obtains (S) -3- hydroxyl -4- cyano butyric acid benzyl esters, yield 98.2% (purity 90.6%).
Example 3:
(S) -3- tert-butyl group siloxy -4- cyano butyric acids methyl esters (IV) 25.7g, benzylalcohol 20g, toluene 250ml are dissolved, NOVO-435 is heated to 60 DEG C, reduced-pressure backflow 12 hours, constantly removes a small amount of hexamethylene steamed therebetween, cools down, and filters, and adds Water 50ml is washed twice, and concentrates organic phase, and the material that decompression boils off low useless point obtains (S) -3- tert-butyl group siloxy -4- cyano butyric acids Benzyl ester, yield 91.2% (purity 86.6%).
Example 4:Compound II preparation
(S) -3- hydroxyl -4- cyano butyric acids benzyl esters (II) (11g) are dissolved in dichloromethane (150ml), add imidazoles (8.5g), TBSCl (17.5g) is added portionwise, 25 DEG C of stirrings, 12 hours, filtering, reclaims imidazole hydrochloride, adds water 80ml, Neutrality is adjusted to glacial acetic acid and sodium bicarbonate water, is extracted, aqueous phase is extracted once again with dichloromethane 50ml, merges organic phase, decompression Be concentrated to give (S) -3- tert-butyl group siloxy -4- glutaryl amine mono-methyls (II) is for colourless or pale brown oil thing, yield 100%.
Example 5:Compound II preparation
(S) -3- hydroxyl -4- cyano butyric acids benzyl esters (II) (11g) are dissolved in DMF (100ml), add imidazoles (8.5g), TBSCl (17.5g) is added portionwise, 25 DEG C of stirrings, 8 hours, adds water 180ml, ethyl acetate 200ml extractions, organic phase is used Glacial acetic acid and sodium bicarbonate water are adjusted to neutrality, and extraction, aqueous phase is extracted once again with ethyl acetate 50ml, merge organic phase, and decompression is dense (the S) -3- tert-butyl group siloxy -4- cyano butyric acids benzyl esters (II) that contract are colourless or pale brown oil thing, yield 86%.
Example 6:Compound I preparation
By (S) -3- tert-butyl group siloxy -4- cyano butyric acids benzyl esters (16.6g), methanol 100ml, chlorinated ketone/4A molecular sieves 6g, acetaldoxime 12g, 65 DEG C are slowly warming up to, reacted 10 hours, after TLC detection reactions completely, filtering, filtrate concentration, obtain product (S) -3- tert-butyl groups siloxy -4- glutaryls amine list benzyl ester (I), yield 92.6%.
1HNMR(CDCl3)δ:-0.03(3H,s)Si-CH3;0.00(3H,s)Si-CH3;0.76(9H,s)Si-C-(CH3)3; 2.3~2.54 (4H, m) CH2C(SiOTBS)CH2;4.41~4.45 (1H, h) methyl-CH (SiOTBS)-methyl;4.97~5.05 CH on (dd, 2H) benzyl2;5.73~6.12 (d, 2H) NH2;Hydrogen on 7.25 (5H, s) phenyl ring.
Example 7:Compound I preparation
By (S) -3- tert-butyl group siloxy -4- cyano butyric acids benzyl esters (16.6g), methanol 100ml, Amberlyst A-26 (OH) 6g, water 20ml, hydrogen peroxide 10g (30%) is slowly added dropwise, reacts 6 hours, after TLC detection reactions completely, filtering, use dichloro Methane 300ml is extracted, and organic phase washes twice with 5% sodium thiosulfate, concentration, obtain product (S) -3- tert-butyl groups siloxy - 4- glutaryl amine list benzyl esters (I), yield 67.5%.
Example 8:Compound V preparation
By (S) -3- tert-butyl group siloxy -4- cyano butyric acids methyl esters (13g), toluene 50ml, add copper chloride/4A molecular sieves 1.35g, acetaldoxime 12g, 50 DEG C are slowly warming up to, reacted 16 hours, after TLC detection reactions completely, filtering, filtrate is concentrated to give production Product (S) -3- tert-butyl group siloxy -4- glutaryl amine mono-methyls, yield 92.6%.
Example 9:Compound V preparation
By (S) -3- tert-butyl group siloxy -4- cyano butyric acids ethyl esters (13.5g), n-hexane 80ml, add copper chloride/4A points Son sieve 1.35g, acetaldoxime 12g, are slowly warming up to 60 DEG C, react 16 hours, after TLC detection reactions completely, filtering, and filtrate concentration Obtain product (S) -3- tert-butyl group siloxy -4- glutaryl amine mono-methyls, yield 90.5%.
Example 10:Compound V preparation
By (S) -3- tert-butyl group siloxy -4- cyano butyric acids ethyl esters (13.5g), methanol 50ml, add cupric oxide 2.6g, second Aldoxime 12g, 55 DEG C are slowly warming up to, reacted 6 hours, after TLC detection reactions completely, filtering, filtrate is concentrated to give product (S) -3- Tert-butyl group siloxy -4- glutaryl amine mono-methyls, yield 90.5%.
Example 11:Compound V preparation
By (S) -3- tert-butyl group siloxy -4- cyano butyric acids sodium (13g), water 50ml, 30% hydrogen peroxide 10g is slowly added into, At 60 DEG C, Amberlyst A-26 (OH) 5g, time for adding be 2 hours, stir 1 hour, add dichloromethane 120ml, extraction Take, organic phase is washed twice with 5% sodium thiosulfate, concentration, and it is 2~3 to adjust pH with 10% oxalic acid, extracts, concentration, obtains product (S) -3- tert-butyl groups siloxy -4- glutaryl amine, yield 54.3%.
Example 12:The preparation of copper chloride catalyst
1g copper chloride dihydrate, water 600ml is added in reaction bulb, 4A molecular sieve 6g is added, is stirred overnight.Filtering, use Water and acetone elution, it is put into and 1 hour blue solid for obtaining 6.3g is dried at 140 DEG C of baking oven, then is dried more than 2 hours at 140 DEG C, cooling Chlorinated ketone catalyst is just obtained to room temperature.
Example 13:
By (R) -3- tert-butyl group siloxy -4- cyano butyric acids benzyl esters (16.6g), dichloromethane 100ml, chlorinated ketone/4A divides Son sieve 6g, acetaldoxime 12g, are slowly warming up to 40 DEG C, react 20 hours, after TLC detection reactions completely, filtering, filtrate concentration, obtain Product (R) -3- tert-butyl group siloxy -4- glutaryl amine list benzyl esters yield 91.8%.
Example 14:
By (R) -3- tert-butyl group siloxy -4- cyano butyric acids benzyl esters (16.6g), methanol 100ml, copper sulphate 6g, acetaldoxime 12g, 65 DEG C are slowly warming up to, reacted 18 hours, after TLC detection reactions completely, filtering, filtrate concentration, obtain product (R) -3- uncles Butyl siloxy -4- glutaryl amine list benzyl esters yield 93.4%.
Example 15:
By (R) -3- tert-butyl group siloxy -4- cyano butyric acids benzyl esters (16.6g), methanol 100ml, copper acetate 3.2g, acetaldehyde Oxime 12g, 65 DEG C are slowly warming up to, reacted 20 hours, after TLC detection reactions completely, filtering, filtrate concentration, obtain product (R) -3- Tert-butyl group siloxy -4- glutaryl amine list benzyl esters yield 96.2%.

Claims (1)

1. the preparation method of one kind (S) -3- tertiary butyl dimethyl Si base glutaric acid list benzyl ester monoamides, it is characterised in that chemical combination Thing III is oxidized to (S) -3- tert-butyldimethyl silyls with acetaldoxime in a solvent under cupric oxide, copper acetate or catalysis of cupric sulphate Epoxide glutaric acid list benzyl ester monoamides,
Wherein P is TBS;
Solvent is methanol, ethanol, acetone, n-hexane, dichloromethane or toluene, and compound III is 1 with solvent quality ratio:2~1: 20, compound III:Acetaldoxime mol ratio is 1:1.5~1:4, compound III are 1 with catalyst quality ratio:0.1~1:0.5, 25~68 DEG C of reaction temperature, reaction time are 5~16 hours.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN104370953A (en) * 2014-08-24 2015-02-25 浙江新东港药业股份有限公司 (R)-tert-butyl dimethyl siloxy-glutaric acid monoester preparation method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104066846A (en) * 2011-11-28 2014-09-24 迈兰实验室有限公司 Process for producing chiral statin side chain intermediates employing candida|antarctica lipase B
CN104370953A (en) * 2014-08-24 2015-02-25 浙江新东港药业股份有限公司 (R)-tert-butyl dimethyl siloxy-glutaric acid monoester preparation method
CN104356155A (en) * 2014-10-20 2015-02-18 浙江新东港药业股份有限公司 Preparation method of (S)-tert-butyldimethylsilyloxy-glutaramate

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