CS274344B1 - Method of 2-/4-(2-propylthio)phenyl/propionic acid's preparation - Google Patents

Method of 2-/4-(2-propylthio)phenyl/propionic acid's preparation Download PDF

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CS274344B1
CS274344B1 CS479389A CS479389A CS274344B1 CS 274344 B1 CS274344 B1 CS 274344B1 CS 479389 A CS479389 A CS 479389A CS 479389 A CS479389 A CS 479389A CS 274344 B1 CS274344 B1 CS 274344B1
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Czechoslovakia
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propionic acid
preparation
propylthio
phenyl
substance
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CS479389A
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Czech (cs)
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CS479389A1 (en
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Miroslav Dr Ing Drsc Protiva
Karel Ing Csc Sindelar
Jiri Rndr Drsc Jilek
Jaroslava Mudr Csc Grimova
Eva Mudr Maturova
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Protiva Miroslav
Sindelar Karel
Jilek Jiri
Grimova Jaroslava
Maturova Eva
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Priority to CS479389A priority Critical patent/CS274344B1/en
Publication of CS479389A1 publication Critical patent/CS479389A1/en
Publication of CS274344B1 publication Critical patent/CS274344B1/en

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Abstract

The solution falls with the branch of synthesis of pharmaceuticals. Its principle consists in method of preparation of 2-(4-(2-propylthio)phenyl)propionic acid. This substance is characteristic by its antiphlogistic and analgesic effects and can be used practically in pharmacotherapy. In comparison with generally known ibuprofen (registered trademark) it has comparable antiphlogistic effect and gastrotoxicity. Its advantages consist in higher analgesic effect and lower acute toxicity in mice administered orally. The preparation method of the substance I according to the solution consists in reaction of 2-(4-mercaptophenyl)propionic acid with 2-brompropane in dimethylformamide in presence of potassium carbonate at a temperature of 50 to 80 degrees C and in subsequent hydrolysis of non-characterised intermediary product by boiling solution of sodium hydroxide in aqueous ethanol.

Description

Vynález se vzorce I týká způsobu přípravy kyseliny 2-(4-(2-propylthio)fenyl)propionová Co^fThe invention of the formula I a process for preparing 2- (4- (2-propylthio) phenyl) propionic Co ^ f

Kyselina vzorce I podle vynálezu se vyznačuje protízánětlivou účinností v několika modelech zánětu a dále účinností analgetickou.The acid of formula I according to the invention has anti-inflammatory activity in several models of inflammation and analgesic activity.

Literatura (Adams S. S. et al., □.Pharm. Sci. 56, 1686 (1967); Arch, Int. Pharmacodyn. Ther. 178, 115 (1969) uvádí látku podobné struktury II,The literature (Adams S.S. et al., Pharm. Sci. 56, 1686 (1967); Arch. Int. Pharmacodyn. Ther. 178, 115 (1969) discloses a compound of similar structure II,

COO}} ch3 (IIb která je známá pod geherickým označením ibuprofen. Také ibuprofen má protizánětlivou a analgetickou účinnost a doznal ve farmakotherapeutické praxi velkého rozšini a těší se značné oblibě u pacientů trpících bolestmi kloubů na basi arthritických onemocnění.COO}} ch 3 (II b), known under the geo-brand ibuprofen. Also ibuprofen has anti-inflammatory and analgesic efficacy and has been widely used in pharmacotherapeutic practice and enjoys great popularity in patients suffering from arthritic joint pain.

Látka vzorce I byla s ibuprofenem srovnána v řadě testů na hlodavcích a byla shledána rovnocennou, pokud Jde o protizánětlivý účinek 8 výhodnější z hlediska toxicity a analgetické účinnosti, jak je to doloženo následujícími výsledky:The compound of formula I has been compared with ibuprofen in a number of rodent tests and has been found to be equivalent to an anti-inflammatory effect 8 in terms of toxicity and analgesic efficacy, as evidenced by the following results:

(a) Akutní orální toxicita u myši, LD5Q v mg/kg: I, 2 240; II, 1 350.(a) Acute oral toxicity in mice, LD 50 in mg / kg: 1,240; II, 1350.

(b) Gastrotoxicita u krys (Robert A., Nezamis □. E., Proč-Soc.Exp. Biol. Med. 99, 443 (1958)), uvedeny orálni dávky v mg/kg a hodnoty ulcerogenního indexul(b) Gastrotoxicity in rats (Robert A., Nezamis E.E., Proc-Soc.Exp. Biol. Med. 99, 443 (1958)) reported oral doses in mg / kg and ulcerogenic index values

I, 50, 97,5; 100, 270; 200, 300I, 50, 97.5; 100, 270; 200, 300

II, 50, 208; 100, 233; 200, 300 (c) Protizánětlivá aktivita u krys při použiti karragaeninového modelového zánětu; jsou uvedena procenta inhibice zánětu při použiti dávky 100 mg/kg p. o. :II, 50, 208; 100, 233; 200, 300 (c) Anti-inflammatory activity in rats using a carragaenine model inflammation; the percent inhibition of inflammation at 100 mg / kg p.o. is given:

I 58 (statisticky významné)I 58 (statistically significant)

II, 55 (statisticky významné) (d) Protizánětlivá aktivita u krys při použiti kaolinového modelového záoětu;II, 55 (statistically significant) (d) Anti-inflammatory activity in rats using kaolin model inflammation;

Jsou uvedena procenta inhibice zánětu při použiti dávky 100 mg/kg p. o. :The percent inhibition of inflammation at a dose of 100 mg / kg p.o. is given:

I, 40 (statisticky významné)I, 40 (statistically significant)

II, 40 (statisticky významné) (e) Protizánětlivá aktivita u krys při použiti adjuvantniho otoku zadni končetiny jako modelu zánětu; jsou uvedena procenta inhibice zánětu při použití dávkyII, 40 (statistically significant) (e) Anti-inflammatory activity in rats using adjuvant hindlimb swelling as an inflammatory model; the percent inhibition of inflammation at the dose is indicated

100 mg/kg p. o. :100 mg / kg p.o.

I, 35 (statisticky významné)I, 35 (statistically significant)

CS 274 344 BlCS 274 344 Bl

II, 55 (statisticky významné) (f) Analgetická účinnost u myší v testu intraperitoneálnlho drážděni, ED50 v m9/'<9 P. o. ·II, 55 (statistically significant) (f) Analgesic efficacy in mice in the intraperitoneal irritation test, ED 50 at m 9 / < 9 P. o ·

I, 82; II, 170.I, 82; II, 170.

(g) Analgetická účinnost u krys v testu zánětlivé hyperelgesie (algesimetr) vyjádřená v procentech inhibice bolesti po podání dávek 150 mg/kg p. o. :(g) Analgesic efficacy in rats in an inflammatory hyperelgesia test (algesimeter), expressed as a percentage of pain inhibition after 150 mg / kg p.o.

I, 37; II, 45 (obě hodnoty statisticky významné) (h) Analgetická účinnost u krys v testu tlakové analgesie po podáni orálních dávek 200 mg/kg p. o. : účinnost je vyjádřena v procentech zvýšeni prahu bolesti oproti neléčené kontrolní skupině v intervalech 1 h a 3 h po podání:I, 37; II, 45 (both statistically significant) (h) Analgesic efficacy in rats in a pressure analgesia test after oral dosing of 200 mg / kg po: efficacy is expressed as a percentage of increase in pain threshold versus untreated control group at 1 h and 3 h after administration :

I, 129 %, 87 %; II, 100 %, 81 %I, 129%, 87%; II, 100%, 81%

Látke vzorce I podle vynálezu má tedy určité výhody ve srovnání s ibuprofenem (II). Látka vzorce I je po chemické stránce nová, tj. nikdy nebyla popsána jako charakterizovaná substance. Nelze ji však chránit látkově, protože byla zahrnuta do obecného vzorce v předmětu GB patentu č. 1 012 480. Vztahuji se na ni tedy i možnosti přípravy v citovaném patentu uvedené pro látky analogické.Thus, the compound of formula I of the invention has certain advantages over ibuprofen (II). The compound of formula I is new in chemical terms, ie it has never been described as a characterized substance. However, it cannot be protected by substance because it has been included in the general formula in GB patent No. 1 012 480. Therefore, it also extends to the preparation possibilities given in the cited patent for analogous substances.

Nyni bylo zjištěno, že látku vzorce I lze připravit způsobem, který neni uveden ani Jeko možnost v popisu a nárocích citovaného patentu. Tento způsob spočívá v reakci známé kyseliny 2-(4-merkaptofenyl)propionové (Fr. MS,444, Addn. 0296) vzorceIt has now been found that the compound of formula (I) may be prepared in a manner that is not mentioned in the specification and claims of the cited patent. This process consists in reacting the known 2- (4-mercaptophenyl) propionic acid (Fr. MS, 444, Addn. 0296) of the formula

III.III.

(III), s 2-brompropanem v dimethylformamidu při teplotách 50 až 80 °C za přítomnosti uhličitanu draselného a v následujíc! hydrolýze vzniklého a necharakterizovaného meziproduktu hydroxidem sodným ve vodném ethanolu. Kyselina vzorce I vzniká tímto způsobem v dobrém výtěžku a jedinou krystalizaci z petroletheru ji lze ziskat v čistém stavu. Ději identita byla zajištěna jednak analyticky, jednak pomocí spekter (IČ, NMR). De to krystalická látka tajici při 66 až 67 °C. Podrobnosti způsobu přípravy, kzerý je předmětem vynálezu, uvádi přiklad, který je znázorněn možnosti přípravy látky vzorce I podle vynálezu.(III), with 2-bromopropane in dimethylformamide at temperatures of 50-80 ° C in the presence of potassium carbonate and in the following steps: hydrolysis of the formed and uncharacterized intermediate with sodium hydroxide in aqueous ethanol. The acid of formula (I) is formed in this manner in good yield and can be obtained in a pure state by a single crystallization from petroleum ether. The identity was ensured both analytically and by spectra (IR, NMR). De to crystalline substance melting at 66-67 ° C. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention illustrates the preparation of the compound of formula (I) according to the invention.

Směs 25,5 g kyseliny 2-(4-merkaptofenyl)propionové, 38 g uhličitanu draselného, 34,4 g 2-brompropanu a 100 ml dimethylformamidu se míchá a zahřívá 5 hodin na 60 °C.A mixture of 25.5 g of 2- (4-mercaptophenyl) propionic acid, 38 g of potassium carbonate, 34.4 g of 2-bromopropane and 100 ml of dimethylformamide is stirred and heated at 60 ° C for 5 hours.

Po ochlazeni se směs zředi 200 ml vody, vyloučený meziprodukt se extrahuje benzenem a extrakt se zpracuje. Odpařením získaný zbytek (30,4 g) se rozpustí v 50 ml ethanolu, přidá se roztok 30 g hydroxidu sodného ve 100 ml vody a směs se voři 5,5 hodinyAfter cooling, the mixture is diluted with 200 ml of water, the precipitated intermediate is extracted with benzene and the extract is worked up. The residue obtained by evaporation (30.4 g) is dissolved in 50 ml of ethanol, a solution of 30 g of sodium hydroxide in 100 ml of water is added and the mixture is boiled for 5.5 hours.

CS 274 344 Bl pod zpětným chladičem. Ethsnol se odpaří, zbytek se rozpusti ve 400 ml vody, roztok se promyje benzenem a okyselí se kyselinou chlorovodíkovou. Vyloučený produkt se izoluje extrakci benzenem a získá se jeho odpařenímj 22 g (70 %), t, t. 56 až 63 °C. Krystalizací z petroletheru se získá čistá látka, tj, kyselina vzorce I, tající při 66 až 67 °C.CS 274 344 B1 under reflux condenser. The ethanol is evaporated, the residue is dissolved in 400 ml of water, the solution is washed with benzene and acidified with hydrochloric acid. The precipitated product is isolated by extraction with benzene and is obtained by evaporating it to 22 g (70%), mp 56-63 ° C. Crystallization from petroleum ether gave the pure product, i.e. the acid of formula I, melting at 66-67 ° C.

Claims (1)

Způsob přípravy kyseliny 2-(4-(2-propylthio)fenyl)propionové vzorce I, (i) vyznačující se tim, že se kyselina 2-(4-merkaptofenylJpropionová přivede k reakci s 2-brompropanem v dimethylformamidu za přitomnosti uhličitanu draselného při teplotě 50 až 80 °C a vzniklý meziprodukt se podrobí hydrolýze vroucím roztokem hydroxidu sodného ve vodném ethanolu.Process for the preparation of 2- (4- (2-propylthio) phenyl) propionic acid of the formula I, (i) characterized in that 2- (4-mercaptophenyl) propionic acid is reacted with 2-bromopropane in dimethylformamide in the presence of potassium carbonate at a temperature 50 DEG-80 DEG C., and the resulting intermediate is hydrolyzed by boiling sodium hydroxide in aqueous ethanol.
CS479389A 1989-08-14 1989-08-14 Method of 2-/4-(2-propylthio)phenyl/propionic acid's preparation CS274344B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2136018A1 (en) * 1997-06-17 1999-11-01 Menarini Lab Cyclooxygenase-i selective inhibitors and the use thereof as analgesic, antiinflammatory and antiarthritic agents

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2136018A1 (en) * 1997-06-17 1999-11-01 Menarini Lab Cyclooxygenase-i selective inhibitors and the use thereof as analgesic, antiinflammatory and antiarthritic agents

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