CA1277323C - Thiazolidinedione derivatives, their production and use - Google Patents

Thiazolidinedione derivatives, their production and use

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Publication number
CA1277323C
CA1277323C CA000499769A CA499769A CA1277323C CA 1277323 C CA1277323 C CA 1277323C CA 000499769 A CA000499769 A CA 000499769A CA 499769 A CA499769 A CA 499769A CA 1277323 C CA1277323 C CA 1277323C
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Prior art keywords
pharmaceutically acceptable
compound
salt
pyridyl
ethoxy
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French (fr)
Inventor
Kanji Meguro
Takeshi Fujita
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Takeda Pharmaceutical Co Ltd
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Takeda Chemical Industries Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D213/28—Radicals substituted by singly-bound oxygen or sulphur atoms
    • C07D213/30—Oxygen atoms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/06—Antihyperlipidemics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links

Abstract

Abstract Thiazolidinedione derivatives of the formula:

Description

lZ~7~73Z3 Thiazolidinedione Derivatives, Their Production and Use This invention relates to novel thiazolidinedione derivatives, a method of preparing them and antidiabetic agents containing same, which is utilized in the field ~` of medicines.
A variety of biguanide and sulfonylurea derivatives have been used clinically as antidiabetic agents.
-~ However, the biguanides are now scarecely used, because they tend to cause lactic acidosis, and use of the sulfonylureas, though they have strong hypoglycemic activities, requires sufficient precaution, because they cause serious hypoglycemia frequently. Therefore, a new type of antidiabetic agent free from these defects has been desired.
On the other hand, in Japanese Unexamined Patent Publication Nos. 22636/1980 and 64586~1980,~Chemical &
Pharmaceutical Bulletin,~30, p. 3563 (1982), ibid, 30, p. 3580 (1982)r and ibid, 32, p. 2~67 (1984), reference is made to a variety of thiazolidlnediones;having blood glucose and lipid lowerin~ actions. Antidiabetic activity o~ clglitazone was also reported in~Diabetest 32, p. 804 ~1983). Those compounds, however, have not yet been put to practical use. As the reasons, 1~ insufficient activities or/and 2) serious toxicities may be mentioned.

~ ,~t7.~3;~ 3 2~2~5-655 The present inventors synthesi~ed various compounds which are not concretely descrlbed in the above-mentioned puhllcations of unexamined patent appllcations and have made skudies on them to find the compounds exhibitin~ potent pharmacological effects with lower toxicity.
The present invention :Ls to provide aompounds ~hich aan be prac~ically used as antidiabetic agents~Vingabroad safety margin between pharmacolo~ical effect and toxiclty or unfavourable side reactions.
10The present invention provides.
1. A compound of the formula:

C2H5 ~ 2 2 ~ ~ 2 ¦ < (I~
b~
O
or a pharmaceutically acceptable salt thereof, 2. A process for preparin~ a compound of the formula (I) or a pharmaceutically acceptable salt thereof, which aomprises ; 20 hydrolyzlng a compol~nd of the formula, C2E15 ~ CH2~H~- 0 r ~ - CE12 ~H (II) S
NH
:
:

,~
3~3 and if reyuired, converting a hydrolysis product into a pharmaceutically acceptable salt thereof, and 3. An antidlabetic agent comprising a pharmaceutically acceptable carrier, excipient or filler and a compound of the formula (I) or a pharmaaeutically aaceptable salt thereof in an amount sufficient to lower blood glucose or blood lipid level.
The compounds representable by the above ~ormula ~I) include, specifically stating, the ~ollowiny ones.

, .

~.2773Z3 5-[4-[2-(3-ethyl~2-pyridyl)ethoxy~benzyl~ 2,4-thiazolidinedione, 5-[4-[2-(4-ethyl-2-pyridyl)ethoxy~benzyl]-2,4-thiazolidisedione, 5-[4-[2-(5-ethyl-2-pyridyl)ethoxy~benzyl]-2,4-thiazolidinedione, 5-[4-[~-(6-ethyl-2-pyridyl)ethoxy~benzyll-2,4-thiazolidinedione.
The compound (I) of this invention contains both basic nitrogen and acid nitrogen in its molecule, and it can be led to a pharmac~utically acceptable salt, when desired, by using a suitable acid or base.
Such acid salts are exemplified by mineral salts (e.g. hydrochloride, hydrobromide, s~lfate, etc.), organic acid salts te.g. succinate, maleate, fumarate, malate, tartrate, etc.) and sulfonates ~e.g. methane-sulfonate, benzenesulfonate, toluenesulfonate, etc.).
Such basic salts are exemplified by alkali metal salts e.g. sodium salt, potassium salt, alkaline earth metal salts,e.g. calcium salt, etc. All of these salts can be prepared by E~ se known means.
The compound (I) of this invention or a pharma-cologically acceptable salt thereoi exhibits blood-glucose and blood-lipid lowering action with lower toxicity, which can be used as it is or in admixture with a ~ se known pharmace~tically acceptable carrier, excipient or filler as an antidiabetic agent for mammals including man.
The antidiabetic agent is usually administered orally as tablets, capsules ~including soft capsules and microcapsules), powders, granules, etc. and depending on cases, parenterally as injections, suppositories, pellets, etc. Oral administration to an adult patient is desirably 0.05-10 mg/kg body weight/day~, and parenterally 0.01-10 mg/kg body weight~day, once daily , ~

~D~1~ ~ J
_ ~ _ or divided into 2-4 times a week.
The compound represented by the above mentioned general formula (I) and pharmaceutically acceptable salts thereof [hereinafter collectively referred to as "Compound (I)"] can be prepared by subjacting a compound represented by the general formula (II) to hydrolysis.
This reaction proceeds advantageously in a proper solvent by employing a minexal acid. The solvent i8 exemplified by alcohols (e.g. methanol, ethanol, propanol, butanol, isobutanol, 2-methoxyethanol, etc.), dimethyl-sulfoxide, sul~olane, dioxane, te~rahydrofuran, dimethoxyethane, etc., and the mineral acid is exemplified by hydrochloric acid, hydrobromic acid, sulfuric acid, etc. The reaction temperature ranges from 20C to 150C. The reaction time i5 0.5 - 20 hours.
The compound (I) or a pharmaceutically acceptable salt thereof produced as mentioned above can be isolated and purified by conventional means such as concentration, extraction, recrystallization, chromatography, etc.
The compound xepre~en~d by the above-mentioned general formula ~II) can be produced by the following reactions:
F~NO2 (If ) C~H~\O >
~y~cH2cH2oH
~m) C2Hs~3~ Hæ/Pd~C
N CH2CH20-~N02 >
(V) C2Hs~ 1) NaNO2/HBr N CH2CH20 ~ NH2 2) CH2 - CHCOOR (~) >
(~) t :~

~ ;2773~23 C 2 Hs ~ ~ thiourea N CH 2 CH 2 O ~CH 2 CHCOOR -- ~ ( 11 ) (Vm ) Br [wherein R stands for hydrogen or lower alkyl].

The lower alkyl group represented by R is exemplified hy ~Cl 4) ones such as methyl, ethyl, propyl, isopropyl and butyl.
The reaction for producing compound (V) from compound (III) and compound (IV) is conducted in the presence of, for example, sodi~m hydride. This reaction can be carried out in a solvent e.g. dimethylformamide and tetrahydro-furan at a temperature ranging from -10C to 30C. The reaction from compound (V) to compound (VI) can easily be conducted by conventional catalytic reduction employing,for example,palladium-carbon as the catalyst. Compound (VI) may be isolated as the pure product or can be subjected to the subsequent reaction step without isolation and purification.
Compound (VIII) can be produced by subjecting compound (VI) to diazotization in the presence of an aqueous solution of hydrobromic acid, then allowing the resultant to react with acrylic acid or its lower alkyl ester (VII) in the presence of a copper catalyst e.g. cuprous oxide, cupric oxide, cuprous chloride, cupric chloride, cuprous bromide, cupric bromide, etc. (Meerwein arylation). Compound (VIII) :' ~ 2~73;~.3 can bepurified by e.g. chromatography, and subjected to the subsequent reaction without isolation or purification.
Compound (VIII) is then allowed to react with thiourea to give compound (II). This reaction is carried out usually in alcohols (e.g. methanol, et:hanol, propanol, butanol, isobutanol, 2-methoxyethanol, etc.), dimethylsulfoxide, sulfolane, etc. The reaction temperature is usually 20 -180C,preferably 60 - 150C. The amount of thiourea to be employed is l- 2 moles relative to one mole of compound (VIII).
In this reaction, as the reaction proceeds, hydrogen brcmide is produced as the by-prodùct, and, for capturin~ this by-product, the reaction may be conducted in the presence of sodium acetate; potassium acetate, etc., in an amount of usually l - 1.5 mole relative to 1 mole of compound ; (VlII)o The resultant compound (II) can be isolated, but may be led to the hydrolysis step directly without isolatlon:

`: ~

:` : :

~ 2~73~3 The compound (I) of the present invention has an excellent blood glucose and lipid lowering activity and is remarkably low in toxicity, which is supported by the following experlmental data, Experimental Examples 1. Blood glucose and lipid lowering activity in mice To male KKAY mice (8-10 weeks old, 5 mice/group), the test compounds (at three dosage levels) were given as a dietary admixture in CE-2 powdered diet (CLEA Japan) with free accessto water for 4 days.
Blood samples were taken from the orbital vein on the 5th day.
Blood glucose and plasma triglyceride (TG) were deter-mined by a glucose oxidase method and by using a commercially available assay kit, Cleantech TG-S (Iatron, Japan~, respectively. Based on dose-response curves for blood glucose and plasma TG lowering activity, effective dose of each test compound in 25% decrease from the control value was calculated as the value of ED25 (mg/kg/day).
The results are shown in Table 1.
2. Lipid lowering activity in rats Male Sprague-Dawley rats (7 weeks old, 5 rats/group) were maintained on the laboratory chow (CE-2, CLEA, Japan) with freeaccess to water. All the test compounds (at three dosage levels) suspended in 5% gum arabic solution were *Trade mark 31 ~t773Z3 force~ly administeredto the animals orally for 4 days. Blood samples were taken from the tail vein ,~on the 5th day. Plasma TG was determined using a commercially available assay kit, Cleantech TG~S (Iatron~. ~ased on dose-response curves for lipidlowering activity, effective dose of each test compound in 25% decrease from the control value was calculated as the value of ED25 (mg/kg/day). The results are shown in Table 1.
3. Two-week toxicity study in rats ~ ale andfemale Sprague-Dawley r~ts (5 weeks old, 5 rats/
group) were maintained on the laboratory chow (CE-2, CLEA
Japan) with free access to water. All the test compounds suspended in 5~ gum arabic solution were forcedly administ-ered orally to the animals for,2 weeks once daily. The dose was 100 mg/kg/day for every test compound. The animals were sacrificed in about 20 hours of fasting after termination of the two-week administration by withdrawing blood samples from the abdominal aorta using heparinized syringes under ether anesthesia. Liver and heart were .
removed and weighed. Hematology analysis was alsocarried out using an automatic cell counter. The data represent ~ % increase or decrease from the control value (non-drug ; ~ treated) as shown in Table 1 *Trade mark :

~ 27732~

o o 3 30 R _ ~ + ~ 20 ~ rC 0~ CD 0 3, o ' YA 3 G ~ ~ o ~ o ~ ~ + + -t + -t +

3 ,C _ lo oo o ~ , ~: 3 _ c~ + + ,- + +
~ ~ ~1 ~ C- ~
_ ~ ~ l _+ + + + , _ , nS c~ _ I 1 1 )= ~V~ 3 c~ q~ ~ o ,J~l ~

'~ : : :S ~ _ o ~
N +,, N C~ J~ C`l O
~ ~ ~ ~ ~ ~ V
¦ ~; N e~ ~ ~Z ~ ~ ~ 35~
~: ~ _~ C~ IJ
~ ~ ~ ~ ^~ a ^~

~ ;~'7~3~3 In Table 1, Compound (I) is a compound under the coverage ofthepresent invention, compounds(a) and (b) are known compounds concretely referred to in the Japanese unexamined Patent Publication No.22636/1980.
While compounds (c), (d) and (e) are not concretely referred to in the above-mentioned patent publication, they are cited for comparison, since they are similar to compound (I) of this invention in their chemical structures. As is apparent from the experimental results given in Table 1, Compound (I) of this invention is superior to the compounds (a), (c), (d) and (e) and comparable to the compound (b) in hypoglycemic and hypolipidemic activities, while showing extremely low toxicity as compared with the compounds (a), (b), (d) and (e). Such an effect as above caused by the introduction of an ethyl group is quite unexpected.
Thus, compound (I) of the present invention exhibit~ excellent hypoglycemic and hypolipidemic acivities, and little toxicity to internal organs and blood even by continuous administration for a long period of time.
herefor, compound (I) is of value as a therapeutic agent for Type II diabetes accompanied by obesity or hyperlipemia in mammals including man.~

:

3~3 Example 1 a) To a solution of 2-(5-ethyl-2-pyridyl)ethanol (53.0 g) and 4-fluoronitrobenzene (47.0 g) in DMF (500 ml) was added portionwise under ice-cooling 60% sodium hydride in oil (16.0g). The mixture was stirred under ice-cooling for one hour then at room temperature for30 minutes, poured into water and extracted with ether. The ether layer was washed with water and dried (MgSO4).
The solvent was evaporated off to give 4-[2-t5-ethyl-2 pyridyl)ethoxy]nitrobenzene as crystals (62.0 g, 62.9%).
~ecrystallization from ether-hexane gave colorless prisms, m.p. 53-54C.
b) A solution of 4-[2-(5-ethyl-2-pyridyl)ethoxy]-nitrobenzene (60.0 g) in methanol (500 ml) was hydrogenated at room temperature under one atmospherlc pressure in the presence of 10% Pd-C (50% wet, 6.0 g). The catalyst was removed by filtration and the filtrate was concentrated under reduced pressure. The residual oil was dissolved in acetone (S00 ml)-methanol (200 ml). To the solution was added a 47~ HBr aqueous solution (152 g). The mixture was cooled, to ~hich was added dropwise a solution of Na~O2 (17.3 g) in: water (30 ml) at a ~Y~rature not hi~her than 5C. The whole mi~ture was stirred at 5C for 20 minutes, then methyl acrylate (112 g) was added ~hereto and the b~rature was raised to 38C. C~prous oxide (2.0 g) was added to the mixture in small portions with vigorous stirring. The reaction mixture was stirred until 3.~

nitrogen gas evolution ceased, which was concentrated under reduced pressure. The concentrate was made alkaline with concentrated aqueous ammonia,and extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried ~MgSO4). The solvent was evaporated off to leave methyl 2-bromo-3-{4-[2-(5-ethyl-2-pyridyl)ethoxy]phenyl}propionate as a crude oil (74.09 g, 85.7%). IR(neat)cm~l:1735. NMR ~(ppm) in CDC13: 1.21 (3H,t,J=7), 2.60(2H,q,J=7), 3.0 - 3.6(4H,m), 3.66(3H,s), 4.30(2H,t,J=7), 4.3(lH,m),6.7 - 7.5(6H,m), 8.35(1H,d,J=2).
c) A mixture of the crude oil of methyl 2-bromo-3-{4-[2-(5-ethyl-2-pyridyl)ethoxy]phenyl} propionate (73.0 g) obtained in b) thiourea (14.2 g), sodium acetate (15.3 g) and ethanol (500 ml) was s~irredfor 3 hours under reflux. The reaction mixture was concentrated under reduced pressure, and the concentrate wa~neutralized with a saturated agueous solution of sodium hydrogencarbonate, to whlch were added water (200 ml) and ether (100 mlj.
The whole mixture was stirred for 10 minutes to yield 5-{4-l2~ e=lyl-2-p,rldyl~ethoxy]phenyl}-2 imino-4-: ~ , . ..

27773;~:~

thiazolidinone as crystals (0.3 g, 523.0~). Recrystallization from methanol gave colorless prisms, m~p. 187-188C (decomp.).
Elemental analysis for ClgH21M3O2S

Calcd: C ,6~.20; I-I,5.95; N ,1l.820 Found: C ,6~.20; H ,5.8~1: N ,11. 730 d) A solution of 5-{4-[2--(5-ethyl-2-pyridyl) ~thoxy]benzyl}-2-imino-4-thiazolidlnedinone (23.5 g) in 2N HCl (200 ml) was refluxed for 6 hours. The solvent was evaporated off under reduced pressure, and the residue was neutralized with a saturated aqueous solution of sodium hydrogencarbonate. The crystals (23.5 g, 97.5~) which precipitated were collected by filtration and re-crystallized from DMF-H20 to give 5-{4-l2-(5-ethyl-2-pyridyl)ethoxy]benzyl}-2,4-thiazolidinedione as colorless needles (20.5 g, 86.9~), m.p. 183-1~4C
Elemental~Analysis for C19H20N2O3S

Calcd:- C ,6~ 02 H, 5 66; N, 7 . 86O
Found: C 63.70; H ,5.88; N 8. Olo ' ' e~ To a suspension of 5-{4-[2-(S-ethyl-2-pyridyl) ethoxy]benzyl}-2,4-thiazolidinedione (356 mg) in methanol (l~ ml) was added 28~ sodium methylate/methanol solution (0.2 g) to make a solution.
This solution was concen-trated and diluted with ethyl ether to yield crystals.

. .

~.27~7~3 mhe crystals were collected by filtration and re-crystallized from methanol-ethanol to give the slium salt of 5-{4 [2-(5-ethyl-2-pyridyl)ethoxy]benxyl}-2,4-thiazolidine-dione as colorless crystals (298 mg, 78.8%), m.p. 26Z-263C (decanp.).
Elemental analysis for CLgHlgN2O3SNa:
Calcd.: C,60.31; H,5.06; N,7.40 Found : C,60.20; H,5.07; N,7.52 Example 2 (1) 5-{4-[2-(5-ethyl-2-pyridyl)ethoxy]benzyl}-2,4-thiazolidinedione 100 g (2) Lactose 50 g (3) Corn starch 15 g (4) Carboxymethyl cellulose calcium 44 g (5) Magnesium stearate 1 g 210 g The whole amounts of (1), (2) and (3) and 30 g of (4)were kneaded with water and dried in ~7acuo, followed by granulatlon. With the resultant granules were mixed 14 g of (4) and 1 g of (5) and the whole mixture was tableted with a tableting machine to give 1000 tablets 8 mm in diameter and each ~containing 100 mg of (1) .
Reference Example 1 The compounds listed in Table 2 were prepared in accordance with Example l-a).

~ , .

.2t7~73~3 ~CH2CH20-~N02 __ _ R mP ~ecrystalization solvent yield _ 3 - CH3 1 1 6 - 1 1 7 C ethyl acetate-hexane6 2 . 9 %
_ _ 4 - CH3 7 3 - 7 4 C ethyl acetate-hexane5 7 . 3 %
_ _ 5 - CH3 9 7 - 9 8 C ethyl acetate-hexane7 2 . 3 %

Reference Example 2 In accordance with Example l-b), the following compounds were prepared.
Methyl 2-bromo-3-{4~[2-(3-methyl-2-pyridyl)ethoxy]phenyl}
propionate; IR(Neat)cm~l~ 1735. N~R ~(ppm) in CDC13:
2.34(3H,s), 3.10(1H,dd, J=14 and 7), 3.25(2H,t,J=6), 3.38(lH,dd, J=14 and 7), 3.67(3H,s), 4.29(lH,t,J=7), 4.37(2H,t,J=6), 6.8-7.5(6H,m), 8.35(1H,dd, J=S and 2).

~ 2773Z3 2-Bromo-3-{4-[2-(4-methyl-2-pyridyl]ethoxy]phenyl}

propionic acid methyl ester; IR(Neat)cm~l: 1735.
NMR ~(ppm) in CDC13: 2.30(3H,s), 3.10~(1H, dd, J=14 and 7), 3.26(3H,t,J=7), 3.37(1H,dd, J=14 and 7), 3.67(3H,s), 4.30(31I,t,J=7), 6.7-7.36(6~,m)j 8.37(lH,d,J=6) Reference Example 3 A solution of 4-[2-(5-methyl-2-pyridyl)ethoxy] nitro-henzene (15.0 g) in methanol (150 ml) was subjected to catalytic reduction under 1 atmospheric pressure in the presence of 10% Pd-C (50% wet, 2.0 g). The catalyst was filtered off, and the filtrate was concentrated to give 4-[2-(5-methyl-2-pyridyl)ethoxy]aniline as crystals (12.3 g, 92.5~). Recrystallization from ethyl acetate-hexane gave colorless prisms, m.p. 74-75C~
Elemental analysis for C14H16N2O:

Calcd.: C 773.66; H ,7.06; N ,12.270 Found: C 73.84; H ,?.17~ 2.06O

;

3~

Reference Example 4 To a mixture of 4-[2-(5-methyl-2-pyridyl)ethoxy]aniline (12.0 g), 47% aqueous HBr solution (36.5 g) and methanol (40 ml)-acetone (80 ml) was added dropwise a solution o~

NaNo2 (4.0 g) in water (lO ml) at 5C or below. The whole mixture was stirred at 5C for 20 minutes, then methyl acrylate (27.0 g) was added thereto and the temperature was raised to 38C. Cuprous oxide (1.0 g) was added to the mixture in small portions with vigorous stirring. ~fter nitrogen gas evolution had ceased, the reaction mixture was concentrated under redused pressure. The concentrate was made alkaline with concentrated aqueous ammonia and extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried (rlgSO4). The solvent was evaporated off to leave methyl 2-bromo-3-{4-[2-(5-methyl-2-pyridyl)ethoxy~phenyl}-propionate as a crude oil (17.5 g, 87.5%). IR(Neat)cm~l: 1735. NMR ~(ppm) in CDC13: 2.27(3H,s), 3.10(lH,dd,J=14 and 7), 3.22(2H,t, J=6), 3.38(lH,dd,J=14 and 7),3.66(3H,s), 4.29(2H,t, J=6), 4.32(lH,t,J=7), 6.7-7.5(6H,m), 8.34~1H,d,J=2).

773~3 Reference Example 5 The compounds listed in Table 3 were prepared in accordance with Example l-c).

H2CHzO- ~ S NH

NH
_ mp (decomp.) Recrystalization solvent yield 3 -CH3 230-231~C chroroform-methanol 7 5. 5 %

4 - CH 3 190-191C methanol 4 8 . O %

5 -CH3 203-Z04C chroro~orm~methanol 5 8. 2 %

Reference Example 6 The compounds listed ln Table 4 were prepared in accordance with Example l-d).
.
:: 4 :~
~=` ~

R ~ ~ ~ ~ S NH :
o : R mp Recrystalization solvent yield _ : .
3 -CH3 2l0-2L1C DMF-water 6 5. 7 . . _ ._ 4 -CH3 178-179C chroroform-methanol 7 5. 3 %
:: __ .~ .

-,: , ~ Z~773~

Reference Example 7 A mixture of 2-imino-5-{4-[2-(5-methyl-2-pyridyl~
ethoxy]benzyl}-4-thiazolidinone (8.0 g), 2_ HCl (80 ml) and ethanol (80 ml) was refluxed for 16 hours. The reaction solution was neutralized with a saturated aqueous solution of sodium hydrogencarhonate to yield crystals. The crystals were collected by filtration and re-crystallized from ethanol to give 5-{4-E2-(5-methyl-2-pyridyl)ethoxy]benzyl}-2,4-thiazolidinedione as_colorless prisms (7.0 g, 87.5%), m.p. 192-193C.
Elemental Analysis for C18H18N2O3:
Calcd.: C,63.14: H,5.30; N,8.18 Found : C,63.22; H,5.40: N, 8.11 . ~

Claims (20)

1. A compound of the formula:

(I) or a pharmaceutically acceptable salt thereof.
2. A process for preparing a compound of the formula (I) of claim 1 or a pharmaceutically acceptable salt thereof, which process comprises hydrolyzing a compound of the formula:

(II) and if required, converting a hydrolysis product into a pharmaceutically acceptable salt thereof.
3. A process as claimed in claim 2, wherein C2H5 is in the 3-position of the pyxridine ring.
4. A process as claimed in claim 2, wherein C2H5 is in the 4-position of the pyridine ring.
5. A process as claimed in claim 2, wherein C2H5 is in the 5-position of the pyridine ring.
6. A process as claimed in claim 2, wherein C2H5 is in the 6-position of the pyridine ring.
7. A process as claimed in claim 2, 3 or 4, wherein the hydrolysis is carried out using a solvent and a mineral acid.
8. A process as claimed in claim 5 or 6, wherein the hydro-lysis is carried out using a solvent and a mineral acid.
9. A process as claimed in claim 2, 3 or 4, wherein the hydrolysis product is converted to its pharmaceutically acceptable acid addition salt.
10. A process as claimed in claim 5 or 6, wherein the hydro-lysis product is converted to its pharmaceutically acceptable acid addition salt.
11. A process as claimed in claim 2, 3 or 4, wherein the hydrolysis product is converted to its pharmaceutically acceptable base salt.
12. A process as claimed in claim 5 or 6, wherein the hydro-lysis product is converted to its pharmaceutically acceptable base salt.
13. A process for preparing 5-(4-[2-(5-ethyl-2-pyridyl)-ethoxy]benzyl)-2,4-thiazolidinedione or a pharmaceutically accept-able acid addition or base salt thereof, which process comprises:
hydrolyzing 5-(4-[2-(5-ethyl-2-pyridyl)ethoxy]benzyl)-2-imino-4-thiazolidinedione, and if required, converting a hydrolysis product into a pharmaceutically acceptable acid addition or base salt thereof.
14. A process as claimed in claim 13, wherein the hydrolysis product is converted to its sodium salt.
15. A process as claimed in claim 13 or 14, wherein the hydrolysis is carried out using hydrochloric acid.
16. A process as claimed in claim 13 or 14, wherein the starting material is prepared by reacting methyl 2-bromo-3-(4-[2-(5-ethyl-2-pyridyl)ethoxy]phenyl)propionate with thiourea.
17. A process as claimed in claim 14, wherein the hydrolysis product is treated with sodium methylate to convert the product into its sodium salt.
18. The compound 5-(4-[2-(5-ethyl-2-pyridyl)ethoxy]benzyl)-2,4-thiazolidinedione, or a pharmaceutically acceptable acid addition or base salt thereof.
19. The compound sodium salt of 5-(4-[2-(5-ethyl-2-pyridyl)-ethoxy]benzyl)-2,4-thiazolidinedione.
20. An antidiabetic agent which comprises a pharmaceutically acceptable carrier, excipient or filler and the compound or salt according to clam 1, 18 or 19 in an amount sufficient to exhibit blood glucose- or blood lipid-lowering action.
CA000499769A 1985-01-19 1986-01-17 Thiazolidinedione derivatives, their production and use Expired - Lifetime CA1277323C (en)

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