FI73669B - FORMULATION OF FRAMSTAELLNING AV 5-ALKYL-2-CARBOXY PYRAZINE. - Google Patents
FORMULATION OF FRAMSTAELLNING AV 5-ALKYL-2-CARBOXY PYRAZINE. Download PDFInfo
- Publication number
- FI73669B FI73669B FI821832A FI821832A FI73669B FI 73669 B FI73669 B FI 73669B FI 821832 A FI821832 A FI 821832A FI 821832 A FI821832 A FI 821832A FI 73669 B FI73669 B FI 73669B
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- alkyl
- carboxy
- framstaellning
- pyrazine
- formulation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D241/00—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings
- C07D241/02—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings
- C07D241/10—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D241/14—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D241/24—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Plural Heterocyclic Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Saccharide Compounds (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
7 3 6 6 97 3 6 6 9
MENETELMÄ 5-ALKYYLI-2-KAR30KSIPYRATSIININ VALMISTAMISEKSI -FÖRFARANDE FÖR FRAMSTÄLLN I NG AV 5-ALKYL-2-KARBOX IPYRAZI NMETHOD FOR THE PREPARATION OF 5-ALKYL-2-CARBOXYPYRASIN -FÖRFARANDE FOR FRAMSTÄLLN I NG AV 5-ALKYL-2-CARBOXY
Keksintö koskee menetelmää 5-a 1 kyy 1i-2-karbok sipyratsiinin valmistamiseksi, jolla on yleinen kaavaThe invention relates to a process for the preparation of 5-alpha-2-carboxypyrazine of the general formula
COOHCOOH
JOJJOJ
R1 [Ί jossa R merkitsee C -C -a 1 kyy1iryhmää. v 1 1 ΛR1 [Ί where R represents a C -C -a 1 alkyl group. v 1 1 Λ
Kaavan (I) mukaisia yhdisteitä on kuvattu ja suojattu GB-pa-tentilla 1 361 967 ja niillä on veren rasvaa ja sokeria vähentävä vaikutus. Keksinnön mukaisesti valmistetusta 5 - m e -tyyli-2-karboksipyratsiinista voidaan edelleen edullisesti valmistaa 2-karboksi-5-metyylipyratsiini-4-oksidia, joka . . sellaisenaan on suojattu mainitulla GB-patentiliä.The compounds of formula (I) are described and protected by GB Patent 1,361,967 and have a blood fat and sugar lowering effect. It is further advantageous to prepare 2-carboxy-5-methylpyrazine-4-oxide from 5-methyl-2-carboxypyrazine prepared according to the invention, which. . as such is protected by said GB patent.
’ Kaavan (I) mukaisia 5-'“lkyyli-2-karboksipyratsiineja, joissa R : 11M on edellä esitetty merkitys, voidaan keksinnön mukaan valmistaa siten, että kondensoidaan diaminomaleonitriiliä, jolla on kaava H2N cn (II)According to the invention, 5 - '' alkyl-2-carboxypyrazines of the formula (I) in which R: 11M is as defined above can be prepared by condensing diaminomaleonitrile of the formula H2N cn (II)
H N "''''''''''‘CNH N "'' '' '' '' '' 'CN
‘ j ‘ yleisen kaavan CHOCOR^ mukaisen yhdisteen kanssa, jossa R : 11 ä on edellä mainittu merkitys, polaarisissa liuottimes-sa lämpötilassa 35-85°C ja näin saatu yhdisti, jonka yleinen kaava on 7 3 6 6 9‘J’ with a compound of the general formula CHOCOR 4 wherein R is as defined above in a polar solvent at a temperature of 35 to 85 ° C and the compound thus obtained having the general formula 7 3 6 6 9
CMCM
' fr::)'fr: :)
! W I! W I
missä R, :ilä on edellä esitetty .merkitys, saatetaan reagoimaan hapon kanssa polaarisessa liuotti mess a lämpötilassa n. ICC,J C .wherein R 1 has the meaning given above, is reacted with an acid in a polar solvent at a temperature of about ICC, J C.
Sopivia liuottimia öiaminomaleonitriilin kondersoinnissa glyoksaalin tai -ketoa1dehydin kanssa ovat vesi, 1-60 C-atc-mia sisältävä alkoholi tai niiden seos. K o n d e n s a a t: 1 o r e a k t i o saa mieluimmin tapahtua hapon läsnäollessa.Suitable solvents for the condensation of β-aminomaleonitrile with glyoxal or ketone dehyde include water, an alcohol containing 1 to 60 ° C or a mixture thereof. K o n d e n s a a t: 1 o r e a k t i o should preferably take place in the presence of an acid.
Disyanopyratsiinin (III) reaktio hapon kanssa tuottaa vain y hde n y h d i s t e e n, j olla on k aav.a (I) . Sopiva happo on rikkihappo ja sopiva liuotin on vesi. Hapon väkevyys en edullisesti 30-50 %.Reaction of dicyanopyrazine (III) with an acid yields only one compound of formula (I). A suitable acid is sulfuric acid and a suitable solvent is water. The acid concentration is preferably 30-50%.
Disyanopyrats i. inier. ja happojen väliset reaktiot ovat sinänsä ennestään tunnettuja mm. japanilaisista patenttijulkaisuista 53-3767^, 53-12378 ja 54-154776. Kuitenkin mainitais- s a j ji 1 k a 1 suissa k u vatuilla r e aktio! LI a s a adaan lopputuotteena 2-sy ano-3-k a r bok s 1 am i ·! i oy a t. s i i ni tai 2-karbancyy1i-3-karboksioynatsiini, kun taas keksintömme mukainen voimakas hapan hydro iyy s i muuttaa alkyyl isubsti tuoidur. disyanopyratsiinin 5-alkyyli-2-karboksipyratniiniksi, jossa lähtöaineen molemmat syanoryhmät ovat hydrolysoi tuneet. Lisäksi keksin-"in ·> u k a. 1 n e n r e a k t.. o o r. y 1 i ä 11 ä v '·n s e i e k t i i vinen s i in.a , et t ä se antaa lopputuotteeksi pelkästään kaavan (I) mukaisen 5-a1k y y1i-2-k a r b o k s i p y r a t s i i n in; edes sen kanssa isomeeristä 5-a1kyy1i-3-karboksipyratsiinia ei reaktiossa synny.Disyanopyrats i. Inier. and the reactions between the acids are known per se e.g. Japanese Patent Publication Nos. 53-3767, 53-12378 and 54-154776. However, in the mentioned a j ji 1 k a 1 suu ru action r e action! LI a s a is given as the final product 2-sy ano-3-k a r bok s 1 am i ·! i oy a t. s i i ni or 2-carbancyl-3-carboxyoynazine, while the strong acidic hydrolyz of the present invention alters the alkyl substituent. dicyanopyrazine to 5-alkyl-2-carboxypyratin, where both cyano groups of the starting material are hydrolyzed. In addition, the invention does not give only the 5-a1k y of formula (I) as a final product. Y1-2-carboxypyrazine, even with it, the isomeric 5-alkyl-3-carboxypyrazine is not formed in the reaction.
ti 3 7 3 6 6 9ti 3 7 3 6 6 9
Esimerkki a) L70 g palorypälehappoaldehydiä (10 %:inen vesiliuos mas-sa/tilav.) lisättiin sekoittamalla tipoittain ja huoneenlämpötilassa 100 g:n diaminomaleonitriiliä suspensioon seoksessa, jossa oli 800 ml vettä, 900 ml etanolia ja 45 ml etikka-happoa. 20 minuutin kuluttua oli liukeneminen päättynyt; lämpötila nostettiin 80°C: seen ja sekoitusta jatkettiin vielä 30 minuutin ajan.Example a) L70 g of pyruvic aldehyde (10% aqueous w / v) were added dropwise and at room temperature with stirring a suspension of 100 g of diaminomaleonitrile in a mixture of 800 ml of water, 900 ml of ethanol and 45 ml of acetic acid. After 20 minutes, dissolution was complete; the temperature was raised to 80 ° C and stirring was continued for another 30 minutes.
Sitten jäähdytettiin reaktioseos 0°C:seen ja tuote otettiin talteen suodattamalla. Pestiin vedellä neutraalisuuteen saakka ja kuivattiin, minkä jälkeen jälkeen saatiin 112 g raakaa 2,3-disyano-5-metyyiipyratsiinia, sp. 9?-110uC.The reaction mixture was then cooled to 0 ° C and the product was collected by filtration. Washed with water until neutral and dried to give 112 g of crude 2,3-dicyano-5-methylpyrazine, m.p. 9? -110uC.
NKR (CDC1g) TMS:n suhteen: 2,88 (s, CH ) , 8,858 (s, aromaat tinen protoni).NKR (CDCl 3) for TMS: 2.88 (s, CH), 8.858 (s, aromatic proton).
b) 10 g raakaa 2,3-disyano-5-metyy1ipyratsiinia, joka oli saatu a):n mukaisesti, suspensoituna 100 ml aan rikkihappoa (50 tilav.-% vesiliuos) pidettiin 3 tuntia sekoittaen 100°C:n lämpötilassa. Sitten reaktioseos jäähdytettiin lisäämällä 100 g murskattua jäätä ja saatettiin pH-arvoon 1 lisäämällä 270 ml natriumhydroksidin vesiliuosta (20 % mas-sa/tilav. ) . Vesifaasi uutettiin metyy1ietyy1iketoni11 a; uutteet yhdistettiin ja pestiin neutraa1iseksi kyllästetyllä natriumkloridiliuoksella.b) 10 g of crude 2,3-dicyano-5-methylpyrazine obtained according to a) suspended in 100 ml of sulfuric acid (50% v / v aqueous solution) were kept under stirring at 100 ° C for 3 hours. The reaction mixture was then cooled by adding 100 g of crushed ice and adjusted to pH 1 by adding 270 ml of aqueous sodium hydroxide solution (20% w / v). The aqueous phase was extracted with methyl ethyl ketone; the extracts were combined and washed neutral with saturated sodium chloride solution.
Haihduttamalla liuotin pois tyhjössä saatiin kiinteä jäännös, joka kiteytettiin vedestä. Saatiin 6 g 5-metyyii-2-pyratsiini-karboksyy1ihappoa, sp. 163-167°C.Evaporation of the solvent in vacuo gave a solid residue which was crystallized from water. 6 g of 5-methyl-2-pyrazinecarboxylic acid were obtained, m.p. 163-167 ° C.
NMR (CDClg) TMS:n suhteen: 2,8& (s, CH3)t 8,9, 9.3& (kaksi s, aromaattisia protoneja), 10, 8 S (s, C00H ) .NMR (CDCl 3) for TMS: 2.8 δ (s, CH 3) δ 8.9, 9.3 δ (two s, aromatic protons), 10.8 δ (s, C 10 H).
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8116263 | 1981-05-28 | ||
GB8116263 | 1981-05-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
FI821832A0 FI821832A0 (en) | 1982-05-24 |
FI73669B true FI73669B (en) | 1987-07-31 |
FI73669C FI73669C (en) | 1987-11-09 |
Family
ID=10522093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI821832A FI73669C (en) | 1981-05-28 | 1982-05-24 | Process for the preparation of 5-alkyl-2-carboxypyrazine. |
Country Status (20)
Country | Link |
---|---|
JP (1) | JPS57200368A (en) |
AT (1) | AT387217B (en) |
AU (1) | AU8412682A (en) |
BE (1) | BE893317A (en) |
CA (1) | CA1237724A (en) |
CH (1) | CH649763A5 (en) |
CS (1) | CS226741B2 (en) |
DE (1) | DE3219407A1 (en) |
DK (1) | DK155325C (en) |
FI (1) | FI73669C (en) |
FR (1) | FR2506768B1 (en) |
GR (1) | GR76417B (en) |
HU (1) | HU187716B (en) |
IE (1) | IE52992B1 (en) |
IL (1) | IL65864A (en) |
IT (1) | IT1210478B (en) |
NL (1) | NL8202105A (en) |
SE (1) | SE462971B (en) |
YU (1) | YU42766B (en) |
ZA (1) | ZA823660B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1201417B (en) * | 1985-05-17 | 1989-02-02 | Montedison Spa | PROCEDURE FOR THE PREPARATION OF 2-CARBOXYPYRAZINE 4 OXIDE |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1361967A (en) * | 1972-04-28 | 1974-07-30 | Erba Carlo Spa | Pyrazine 4-oxide derivatives and process for their preparation |
JPS565742B2 (en) * | 1973-09-29 | 1981-02-06 | ||
JPS5134175A (en) * | 1974-09-18 | 1976-03-23 | Sagami Chem Res | Pirajinjudotai no seizohoho |
JPS52153980A (en) * | 1976-06-17 | 1977-12-21 | Nippon Soda Co Ltd | Synthesis of 2,3-dicyanopyrazine |
JPS5488281A (en) * | 1977-12-20 | 1979-07-13 | Nitsupou Kagaku Kk | Manufacture of pyrazine monocarboxylic acid |
JPS5488280A (en) * | 1977-12-20 | 1979-07-13 | Nitsupou Kagaku Kk | Manufacture of dicyanopyradines |
-
1982
- 1982-05-21 NL NL8202105A patent/NL8202105A/en active Search and Examination
- 1982-05-24 AT AT0203682A patent/AT387217B/en not_active IP Right Cessation
- 1982-05-24 IL IL65864A patent/IL65864A/en not_active IP Right Cessation
- 1982-05-24 FI FI821832A patent/FI73669C/en not_active IP Right Cessation
- 1982-05-24 DE DE19823219407 patent/DE3219407A1/en active Granted
- 1982-05-25 GR GR68246A patent/GR76417B/el unknown
- 1982-05-25 CA CA000403636A patent/CA1237724A/en not_active Expired
- 1982-05-25 CS CS823842A patent/CS226741B2/en unknown
- 1982-05-25 AU AU84126/82A patent/AU8412682A/en not_active Abandoned
- 1982-05-25 FR FR8209038A patent/FR2506768B1/en not_active Expired
- 1982-05-26 JP JP57088153A patent/JPS57200368A/en active Granted
- 1982-05-26 SE SE8203273A patent/SE462971B/en not_active IP Right Cessation
- 1982-05-26 ZA ZA823660A patent/ZA823660B/en unknown
- 1982-05-26 IE IE1261/82A patent/IE52992B1/en not_active IP Right Cessation
- 1982-05-27 HU HU821712A patent/HU187716B/en unknown
- 1982-05-27 YU YU1131/82A patent/YU42766B/en unknown
- 1982-05-27 IT IT8221517A patent/IT1210478B/en active Protection Beyond IP Right Term
- 1982-05-27 CH CH3285/82A patent/CH649763A5/en not_active IP Right Cessation
- 1982-05-27 BE BE0/208187A patent/BE893317A/en not_active IP Right Cessation
- 1982-05-27 DK DK239482A patent/DK155325C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3219407A1 (en) | 1983-01-05 |
FI821832A0 (en) | 1982-05-24 |
SE462971B (en) | 1990-09-24 |
IL65864A (en) | 1985-08-30 |
ATA203682A (en) | 1988-05-15 |
HU187716B (en) | 1986-02-28 |
ZA823660B (en) | 1983-03-30 |
JPH0456034B2 (en) | 1992-09-07 |
JPS57200368A (en) | 1982-12-08 |
BE893317A (en) | 1982-11-29 |
CS226741B2 (en) | 1984-04-16 |
FR2506768A1 (en) | 1982-12-03 |
DK239482A (en) | 1982-11-29 |
AU8412682A (en) | 1982-12-02 |
IE52992B1 (en) | 1988-04-27 |
FI73669C (en) | 1987-11-09 |
IE821261L (en) | 1982-11-28 |
NL8202105A (en) | 1982-12-16 |
SE8203273L (en) | 1982-11-29 |
DE3219407C2 (en) | 1990-09-06 |
DK155325B (en) | 1989-03-28 |
YU113182A (en) | 1985-03-20 |
IT1210478B (en) | 1989-09-14 |
IT8221517A0 (en) | 1982-05-27 |
AT387217B (en) | 1988-12-27 |
IL65864A0 (en) | 1982-08-31 |
CH649763A5 (en) | 1985-06-14 |
GR76417B (en) | 1984-08-10 |
DK155325C (en) | 1989-09-18 |
CA1237724A (en) | 1988-06-07 |
YU42766B (en) | 1988-12-31 |
FR2506768B1 (en) | 1985-06-21 |
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MA | Patent expired |
Owner name: FARMITALIA CARLO ERBA S.P.A |