CN106928226B - A kind of preparation method of bromoacetaldehyde condensed ethandiol - Google Patents
A kind of preparation method of bromoacetaldehyde condensed ethandiol Download PDFInfo
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- CN106928226B CN106928226B CN201710147435.2A CN201710147435A CN106928226B CN 106928226 B CN106928226 B CN 106928226B CN 201710147435 A CN201710147435 A CN 201710147435A CN 106928226 B CN106928226 B CN 106928226B
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D473/00—Heterocyclic compounds containing purine ring systems
- C07D473/02—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6
- C07D473/04—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6 two oxygen atoms
- C07D473/06—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6 two oxygen atoms with radicals containing only hydrogen and carbon atoms, attached in position 1 or 3
- C07D473/08—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6 two oxygen atoms with radicals containing only hydrogen and carbon atoms, attached in position 1 or 3 with methyl radicals in positions 1 and 3, e.g. theophylline
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
- C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
- C07D317/10—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings
- C07D317/14—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 not condensed with other rings with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D317/16—Radicals substituted by halogen atoms or nitro radicals
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Abstract
The present invention provides a kind of preparation method of doxofylline, more particularly to the synthetic method of bromoacetaldehyde condensed ethandiol and doxofylline shown in formula 2, including passing through acetaldehyde, ethylene glycol, the side chain bromoacetaldehyde condensed ethandiol and 2 compound of formula of bromine one pot reaction preparation formula 2, which carry out N- hydrocarbyl reaction with theophylline again, can be obtained the doxofylline.Synthetic method raw material of the invention is easy to get, is at low cost, yield is high, concise in technology, economic and environment-friendly, is conducive to the industrial expanded production of the drug.
Description
Technical field
The present invention relates to a kind of preparation methods of doxofylline, belong to pharmaceutical synthesis field.
Background technique
Doxofylline (Doxofylline) chemical name is 1,3- dimethyl -7- (1,3- dioxy cyclopenta -2- base) first
Base -3,7- dihydro -1H- purine -2,6- diketone.Doxofylline has stronger antiasthmatic effect, is the new drug of expansion bronchus, quotient
The name of an article is Anismar, is listed in 1988 in Italy.Its safety is apparently higher than theophylline and aminophylline, is substitution theophylline class
The methyl purine derivative of new generation of drug.Doxofylline be used clinically for bronchial asthma, Chronic Obstructive Pulmonary Disease and
The treatment of the diseases such as expiratory dyspnea caused by other bronchial spasms, mechanism of action are by inhibition inflammation medium, carefully
The release of intracellular cytokine controls the development of respiratory tract chronic inflammation；Inhibit di-phosphate ester enzyme activition egg in asm cell
White enzyme A and G, to reduce intracellular Ca2+Concentration and respiratory tract tension.In addition, doxofylline relaxation bronchial smooth muscle is made
With being 10~15 times of aminophylline, and it is rapid-action, it is only necessary to and 30min, duration of efficacy are up to 12h.
Currently, the document report in terms of doxofylline synthetic method has both at home and abroad: United States Patent (USP) US4187308 is with tea
Alkali acetaldehyde is that raw material prepares doxofylline by solvent refluxing of benzene with ethylene glycol under the catalytic action of p-methyl benzenesulfonic acid, the method
Yield 59.5%, but its solvent benzol is more toxic.Patent CN1133842A theophylline is in the presence of water or organic solvent, with alkali
It reacts and theophylline salt is made, then prepare doxofylline with Haloacetaldehydes condensed ethandiol condensation, yield is 75~85%.Patent
CN1044810C in polar solvent, does acid absorbent with alkali, single step reaction generates using theophylline and Haloacetaldehydes condensed ethandiol
Doxofylline, the method yield are 75~85%.Patent CN1041728C theophylline and 1,1- diethoxy -2- bromoethane are in N, N-
In solvent dimethylformamide, condensing agent is made with potassium carbonate and prepares intermediate 7- (2,2- dialkoxy ethyl) theophylline, the step yield
It is 85%, intermediate makees condensing agent with alkali carbonate, to first again with ethylene glycol in n,N-Dimethylformamide solvent
It is condensed under the catalysis of base benzene sulfonic acid and doxofylline is made, which is 89~91.3%, which completes to react in two steps, total to receive
Rate is relatively low.Liu Hongxia etc. obtains bromoacetaldehyde dimethoxym ethane through bromination alcoholysis using vinyl acetate, then is made with glycol reaction
Side chain bromoacetaldehyde condensed ethandiol, the method for then preparing doxofylline with theophylline condensation again, the method have reached pilot scale level, and
It is proposed to be in the process moisture content in solvent dimethylformamide to the factor that product yield is affected, therefore uses
External import solvent, the raw materials technology are not easy to obtain, higher cost.
To solve the problems, such as that above-mentioned art methods exist, the present invention provides a kind of improvement preparation side of doxofylline
Method, this method meet the Atom economy synthesis theory of Green Chemistry, and raw material is easy to get, and at low cost, yield is high, concise in technology, warp
Ji environmental protection, is conducive to the industrialized production of the drug.
Summary of the invention
The present invention provides a kind of preparation method of doxofylline, includes the following steps:
In the presence of alkali and phase transfer catalyst, bromoacetaldehyde condensed ethandiol shown in theophylline shown in formula 3 and formula 2
Reaction is to be made doxofylline shown in formula 1:
According to the present invention, the alkali can be selected from one of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate or more
The mixture of kind；
The phase transfer catalyst (PTC) can be (poly- selected from tetrabutylammonium bromide, benzyltriethylammoinium chloride, PEG-400
Ethylene glycol 400) one of or a variety of mixtures.
The molar ratio of the theophylline and bromoacetaldehyde condensed ethandiol is 1:1.0~1.8, such as 1:1.1~1.6,1:
1.2~1.5 or 1:1.2~1.4；
The molar ratio of the theophylline and alkali is 1:1~3, such as 1:1.2,1:1.3,1:1.5,1:2 or 1:2.5；
When the phase transfer catalyst is tetrabutylammonium bromide or benzyltriethylammoinium chloride, the theophylline and phase transfer
The molar ratio of catalyst is 1:0.01~0.1, such as 1:0.03~0.05；
It, can be by every mole of 10~30ml of theophylline (such as 12~16ml) when the phase transfer catalyst is PEG-400
The ratio of PEG-400 launches material.
Above-mentioned reaction is condensation reaction, can be carried out in non-protonic solvent or under condition of no solvent.
The non-protonic solvent can be such as acetone, N,N-dimethylformamide, acetonitrile, methylene chloride, acetic acid second
One of ester or a variety of mixtures.For example, when the phase transfer catalyst is tetrabutylammonium bromide or benzyl triethyl ammonium chlorine
When changing ammonium, it can be carried out in the non-protonic solvent or under solvent-free conditions；When phase transfer catalyst is PEG-400
When, theophylline can also be first made to theophylline salt, then carry out condensation reaction under solvent-free conditions with bromoacetaldehyde condensed ethandiol.It is described
Methods known in the art progress can be used in the preparation of theophylline salt, such as: in water or organic solvent such as dehydrated alcohol, N, N- diformazan
In the presence of base formamide or n,N-dimethylacetamide, by theophylline (or theophylline anhydrous) and suitable alkali, such as sodium hydroxide,
One of potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or saleratus etc. or the reaction of a variety of mixtures, are made tea
Alkali salt.
The reaction can be carried out in reflux or non-reflow state.The reaction temperature is specifically as follows 50~150 DEG C.Instead
It can be 1~12h, such as 4~8h, such as 6~7h between seasonable.
Reaction system can be added after mixing other reaction substrates in 2 compound of formula by way of dropwise addition.
After reaction, can be post-processed as follows: ice water washing, filtering, filter residue are recrystallized to obtain target compound.
Wherein, it is preferable to use anhydrous or hydrous alcohols solvent, preferred alcohols for recrystallization.In the aqueous alcohols solvent, water is molten with alcohols
The volume ratio of agent can be (10~1): 1, for example (,) (5~2): 1, such as 3:1.
Preferably, the doxofylline purity for the formula 1 that preparation method of the present invention obtains is 98.5% or more.
Preparation method of the invention furthermore provides the preparation method of bromoacetaldehyde condensed ethandiol shown in formula 2, described
Method includes making ethylene glycol, acetaldehyde and bromine through condensation and bromination reaction bromoacetaldehyde condensed ethandiol shown in formula 2 is made:
The preparation method of bromoacetaldehyde condensed ethandiol shown in formula 2 according to the present invention:
Preferably, the molar ratio of the ethylene glycol, acetaldehyde and bromine is 1~5:1:1~2, such as 2~4:1:1~1.5.
Preferably, the reaction temperature of the method can be room temperature hereinafter, it is preferred that 10 DEG C hereinafter, such as 0~10 DEG C, reaction
Time can be such as 1~5h, preferably 2~4h.
The method can be one kettle way (one-pot reaction).The one kettle way refers to, by reaction raw materials same
It reacts in reactor, is separated without intermediate, directly obtain the synthetic method of target compound；
Preferably, ethylene glycol is first added into reactor, is then added slowly with stirring acetaldehyde, and stir at room temperature
0.5~4h, then in reaction solution be added dropwise bromine and control be added dropwise process temperature lower than room temperature hereinafter, it is preferred that 10 DEG C hereinafter, example
Such as 0~10 DEG C, after being added dropwise, such as 1~5h, preferably 2~4h are reacted under the reaction temperature.
Preferably, after the completion of reaction, carry out following post-processing step: vacuum fractionation is to obtain target compound.
As example, the present invention provides the preparation method of doxofylline, includes the following steps:
Preferably, the bromoacetaldehyde condensed ethandiol purity for the formula 2 that the present invention is prepared is 95% or more.
The present invention also provides the preparation methods of bromoacetaldehyde condensed ethandiol shown in above-mentioned formula 2 in preparing doxofylline
Using.
Beneficial effects of the present invention
The present invention provides the synthetic method of 2 compound represented of formula and doxofylline, including passes through acetaldehyde, ethylene glycol,
It is anti-that the side chain bromoacetaldehyde condensed ethandiol and 2 compound of formula of bromine one pot reaction preparation formula 2 carry out N- hydrocarbylation with theophylline again
The doxofylline should can be obtained.Synthetic method raw material of the invention is easy to get, is at low cost, yield is high, concise in technology, economy
Environmental protection is conducive to the industrial expanded production of the drug.
Specific embodiment
The present invention is further described by following case study on implementation, however the scope of the present invention be not necessarily limited to it is following
Case study on implementation.
Unless otherwise indicated, following reaction raw materials and reagent are commercial product.Those skilled in the art can also be according to
Perception method prepares them.
Embodiment 1
A. the preparation of bromoacetaldehyde condensed ethandiol
12.414Kg ethylene glycol (200mol) is added into reactor tank, is slowly added into 4.41Kg under agitation and newly steams second
Simultaneously 30min is stirred at room temperature in aldehyde (100mol), be added dropwise bromine 15.98Kg (100mol), control be added dropwise process temperature be 10 DEG C with
Under, after being added dropwise, 0~10 DEG C of reaction 3h, vacuum fractionation collects 80~82 DEG C of fraction (3.6KPa) 13.126Kg
(78.6mol), as bromoacetaldehyde condensed ethandiol, yield 78.6%, content are 95% or more.
B. the preparation of bromoacetaldehyde condensed ethandiol
10.326Kg ethylene glycol (166.37mol) is added into reactor tank, it is new to be slowly added into 3.66Kg under agitation
It steams acetaldehyde (83.185mol) and 30min is stirred at room temperature, be added dropwise bromine 14.622Kg (91.504mol), control dropwise addition process temperature
Degree for 10 DEG C hereinafter, being added dropwise after, 0~3 DEG C of reaction 3.5h, vacuum fractionation, collection 80~82 DEG C of fractions (3.6KPa)
11.002Kg (65.883mol), as bromoacetaldehyde condensed ethandiol, yield 79.2%, content are 95% or more.
C. the preparation of doxofylline
Theophylline 13Kg (72.16mol) is added in reactor tank, 8L acetone, 5.77Kg sodium hydroxide (144.32mol),
14.47Kg bromoacetaldehyde condensed ethandiol (86.64mmol) is added dropwise after stirring 10min in 0.7Kg tetrabutylammonium bromide (2.16mol),
It is stirred at reflux 6.3h, reaction end (solvent is acetone: methylene chloride=3:1) is monitored using thin-layer chromatography.After reaction, subtract
Pressure distillation solvent evaporated, with saturated common salt water washing 3 times, filtering, filter residue is recrystallized to give the more rope tea of 17.28Kg with dehydrated alcohol
Alkali (64.98mol), yield 90%, fusing point are 143.5~145 DEG C, and content is 98.5% or more.
Embodiment 2
Theophylline 12.6Kg (69.94mol) is added in reactor tank, 7.85Kg potassium hydroxide (139.88mol), 0.478Kg
14.02Kg bromoacetaldehyde condensed ethandiol (83.93mol) is added dropwise after stirring 10min, water in benzyltriethylammoinium chloride (2.10mol)
60~70 DEG C of temperature control of bath, is stirred to react 6h, monitors reaction end using thin-layer chromatography (solvent is acetone: methylene chloride=3:1).
After reaction, it is evaporated under reduced pressure solvent evaporated, with saturated common salt water washing 3 times, filtering, filter residue is recrystallized to give with dehydrated alcohol
16.69Kg doxofylline (62.74mol), yield 89.7%, fusing point are 143.5~145 DEG C, and content is 98.5% or more.
Embodiment 3
Theophylline 11.6Kg (64.39mol) is added in reactor tank, 7.3L dehydrated alcohol, 3.35Kg sodium hydroxide
(83.71mol) is stirred at reflux 4h, vacuum distillation recovered solvent, gained theophylline salt and 722.68mlPEG-400,12.9Kg bromo
Ethylidene ether (77.27mol) is uniformly mixed, and 60~70 DEG C of water-bath temperature control, is stirred to react 6h, is monitored and is reacted with thin-layer chromatography
Terminal (solvent is acetone: methylene chloride=3:1).After reaction, it is washed three times with 1000ml ice water, filtering, filter residue is used
Water: ethyl alcohol=3:1 (v/v) is recrystallized to give 15.24Kg doxofylline (57.31mol), yield 89%, fusing point be 143.5~
145 DEG C, content is 98.5% or more.
Embodiment 4
Theophylline 12.5Kg (69.38mol) is added in reactor tank, 3.61Kg sodium hydroxide (90.19mol),
0.671Kg tetrabutylammonium bromide (2.08mol), 13.9Kg bromoacetaldehyde condensed ethandiol (83.26mol) are uniformly mixed, water-bath control
60~70 DEG C of temperature, is stirred to react 6.3h, monitors reaction end using thin-layer chromatography (solvent is acetone: methylene chloride=3:1).Instead
It after answering, is washed three times with 1200ml ice water, filtering, filter residue water: it is more that ethyl alcohol=3:1 (v/v) is recrystallized to give 16.24Kg
Rope theophylline (61.05mol), yield 88%, fusing point are 143.5~145 DEG C, and content is 98.5% or more.
The cost of 1 present invention synthesis 1Kg doxofylline of table (with the calculating of embodiment 4)
The cost that the present invention synthesizes 1Kg doxofylline is 139.672~150.869 yuan.
Claims (6)
1. a kind of preparation method of bromoacetaldehyde condensed ethandiol shown in formula 2, wherein the method includes using ethylene glycol, second
Aldehyde and bromine pass through bromoacetaldehyde condensed ethandiol shown in condensation reaction and the obtained formula 2 of bromination reaction:
The method is one kettle way；The one kettle way specifically: ethylene glycol is first added into reactor, then under stiring slowly
Be added acetaldehyde, and at room temperature stir 0.5~4h, then in reaction solution be added dropwise bromine and control dropwise addition process lower than room temperature with
Under, after being added dropwise, 2~4h is reacted under the reaction temperature, and reaction temperature is room temperature or less.
2. preparation method according to claim 1, wherein the ethylene glycol, the acetaldehyde and the bromine feed intake mole
Than for 1~5:1:1~2.
3. preparation method according to claim 1, wherein the ethylene glycol, the acetaldehyde and the bromine feed intake mole
Than for 2~4:1:1~1.5.
4. preparation method according to claim 1, wherein the temperature of the reaction is not higher than 10 DEG C.
5. preparation method according to claim 1, wherein the temperature of the reaction is 0~10 DEG C.
6. described in any item preparation methods according to claim 1~5, wherein further include vacuum fractionation step after the completion of reaction
Suddenly, to obtain bromoacetaldehyde condensed ethandiol.
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| CN108774208A (en) * | 2018-07-10 | 2018-11-09 | 盐城市胜达化工有限公司 | A kind of method of silver bicarbonate activation 2- bromomethyl -1,3- dioxolanes |
| CN108840872A (en) * | 2018-08-22 | 2018-11-20 | 湖北泓肽生物科技有限公司 | The synthetic method of doxofylline |
| CN111233864B (en) * | 2020-03-07 | 2020-12-22 | 安徽恒星制药有限公司 | Method for industrially producing doxofylline |
| CN111995625B (en) * | 2020-08-28 | 2024-03-26 | 开封康诺药业有限公司 | Preparation method of doxofylline |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4255182A (en) * | 1980-03-10 | 1981-03-10 | Velsicol Chemical Corporation | Aminosulfonylthiadiazolylureas |
| CN1106404A (en) * | 1994-11-03 | 1995-08-09 | 中国科学院上海有机化学研究所 | Synthetic process of new drug dosotheophylline |
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| CN1133842A (en) * | 1995-04-18 | 1996-10-23 | 绍兴市医药工业研究所 | Preparation method of doxofylline |
| CN102276586B (en) * | 2010-06-09 | 2014-04-09 | 扬子江药业集团四川海蓉药业有限公司 | Preparation methods of losartan potassium and preparation thereof |
| CN102807564A (en) * | 2012-08-30 | 2012-12-05 | 珠海润都制药股份有限公司 | Preparation method of irbesartan |
| CN103554110A (en) * | 2013-10-29 | 2014-02-05 | 安徽省郎溪县联科实业有限公司 | Preparation method for synthesizing doxofylline |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4255182A (en) * | 1980-03-10 | 1981-03-10 | Velsicol Chemical Corporation | Aminosulfonylthiadiazolylureas |
| CN1106404A (en) * | 1994-11-03 | 1995-08-09 | 中国科学院上海有机化学研究所 | Synthetic process of new drug dosotheophylline |
Non-Patent Citations (1)
| Title |
|---|
| Studies on Cellulose Chemistry. III. Parabromoacetaldehyde and Monobromo-Acetaldehyde. their Preparation, Properties and Utilization for the Synthesis of Bromo- and Hydroxy-Cyclic Acetals Related to Polysaccharides;HAROLDH IBBERT et al.;《Journal of the American Chemical Society》;19230331;第45卷;第734-751页 |
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| CN105418612A (en) | 2016-03-23 |
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