EP1274690A1 - 2-alcoxy-5-methoxypyrimidine ou ses formes tautomeres, ainsi que leur procede de fabrication - Google Patents

2-alcoxy-5-methoxypyrimidine ou ses formes tautomeres, ainsi que leur procede de fabrication

Info

Publication number
EP1274690A1
EP1274690A1 EP01931613A EP01931613A EP1274690A1 EP 1274690 A1 EP1274690 A1 EP 1274690A1 EP 01931613 A EP01931613 A EP 01931613A EP 01931613 A EP01931613 A EP 01931613A EP 1274690 A1 EP1274690 A1 EP 1274690A1
Authority
EP
European Patent Office
Prior art keywords
alkoxy
methoxypyrimidines
hydroxy
reaction
alkylisourea
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01931613A
Other languages
German (de)
English (en)
Inventor
Thomas GÜTHNER
Karl-Heinz Neuhauser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP1274690A1 publication Critical patent/EP1274690A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/60—Three or more oxygen or sulfur atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/52—Two oxygen atoms

Definitions

  • the present invention relates to 2-alkoxy-5-methoxypyrimidines and their tautomeric forms and to processes for their preparation.
  • 5-methoxypyrimidines are important intermediates for the production of pharmaceutical or agrochemical active substances.
  • the active substance also contains a 2-alkoxy group in addition to other substituents.
  • Such applications are e.g. B. in the publications US 5, 1 63.995, DE-OS 40 29 648, FR-A 1 33 31 8 or in Collect. Czech. Chem. Commun. 59 (2), 482 (1 994).
  • a disadvantage of this production process is the extremely long reaction sequence, which, because of the lack of regioselectivity between the 2- and 4-positions on the pyrimidine ring, also tends to form isomers and also only gives low overall yields.
  • the invention was therefore based on the object of providing new 2-alkoxy-5-methoxypyrimidines or their tautomeric forms which are relatively easy to produce technically and in high yields. This object was achieved according to the invention by the 2-alkoxy-5-methoxypyrimidines according to claim 1.
  • R is a linear or branched and optionally unsaturated aliphatic
  • the 2-alkoxy-5-methoxypyrimidines according to the invention can be synthesized from simple precursors in a few reaction steps and in high yields.
  • the 2-alkoxy-4-hydroxy-5-methoxypyrimidines can be prepared by adding an alkyl ester of 3-hydroxy-2-methoxyacrylic acid or its tautomeric forms or an alkali salt thereof with an O-alkylisourea or a corresponding one Salt.
  • Preferred alkyl esters of 3-hydroxy-2-methoxyacrylic acid are the corresponding methyl and ethyl esters. These compounds are preferably prepared from methoxyacetic acid esters in a known manner and reacted without isolation and further purification.
  • Preferred alkali salts of the 3-hydroxy-2-methoxyacrylic acid alkyl ester are its sodium or potassium salt.
  • those of O-methylisourea and O-ethylisourea or salts thereof are used as O-alkylisourea compounds.
  • O-methylisourea sulfate, O-methylisourea hydrogen sulfate, the free O-methylisourea base, O-ethylisourea hydrochloride, O-ethylisourea hydrogen sulfate and the free O-ethylisourea base are used.
  • C r C 4 alcohols especially methanol or ethanol are preferably used.
  • the bases which are preferably used are the free O-alkylisourea, sodium hydroxide, sodium methylate or sodium ethylate.
  • the molar ratio of 3-hydroxy-2-methoxyacrylic acid alkyl ester to O-alkylisourea derivative can be varied within wide limits, but it has proven to be particularly advantageous to set this ratio to 1: 2 to 2: 1.
  • 1 to 5 mol of base are preferably used per mol of the desired pyrimidine compound.
  • reaction of the 3-hydroxymethoxyacrylic acid alkyl ester (or its dautomeric forms or alkali salts) with the O-alkylisourea (salt) is carried out at temperatures between 20 and 100 ° C., in particular at 40 to 80 ° C.
  • the reaction time can vary within wide limits, for economic reasons it is preferably 2 to 1 2 h.
  • the 2-alkoxy-4-hydroxy-5-methoxypyrimidines obtained in this way are preferably precipitated from the reaction mixture by adjusting the pH to 2.0 to 8.0 and separated off by customary methods, for example by filtration.
  • 2-alkoxy-4-hydroxy-5-methoxypyrimidines can easily be e.g. react with phosphorus oxychloride to the 2-alkoxy-4-chloro-5-methoxypyrimidines or with phosphorus oxybromide to the corresponding 2-alkoxy-4-bromo-5-methoxypyrimidines.
  • auxiliary bases are, for example, triethylamine, dimethylaniline and diethylaniline. These auxiliary bases are used in an amount of 0 to 1 mol of auxiliary base per mol of 2-alkoxy-4-hydroxy-5-methoxypyrimidine.
  • Suitable solvents are in principle all organic solvents that are inert towards phosphorus oxychloride or phosphorus oxybromide, such as. B. toluene, xylene, hexane, cyclohexane or dichloromethane.
  • the corresponding reaction takes place at a temperature of 40 to 120 ° C., preferably 70 to 110 ° C.
  • the 2-alkoxy-4-chloro-5-methoxypyrimidines according to the invention or the 2-alkoxy-4-bromo-5-methoxypyrimidines which can be prepared analogously can be prepared using conventional subsequent reactions, for. B. by reaction with potassium fluoride or sodium fluoride in the corresponding 2-alkoxy-4-fluoro-5-methoxypyrimidines.
  • the reaction with the thiols R 3 SR or its alkali metal salts in an organic solvent can also be carried out analogously at temperatures between 40 and 120 ° C. Possibly. can then the mercapto group SR 3 with suitable oxidizing agents such. B.
  • HOCl or peroxo compounds especially hydrogen peroxide
  • Hydrocarbons, alcohols, ethers, esters, amides or nitriles have proven to be particularly advantageous as organic solvents.
  • the 2-alkoxy-5-methoxypyrimidines according to the invention can be prepared in a few reaction steps, in excellent yields and in a technically simple manner.
  • Example 1 31 5.5 g of 2-methoxyacetic acid methyl ester were mixed with 1485.8 g of methyl formate. 83.8 g of solid sodium methylate were metered into this mixture at 15 ° C. over 90 minutes. The mixture was stirred at 15 ° C for 22 hours. Then 450 g of methanol were added and the excess methyl formate was distilled off. A methanolic suspension of crude methyl 3-hydroxy-2-methoxyacrylic acid was obtained.
  • Example 3 The suspension of methyl 3-hydroxy-2-methoxyacrylic acid obtained according to Example 1 was placed at 40 ° C. and the solution of O-methylisourea base obtained according to Example 2 was metered in over 2 hours. The mixture was then heated to 65 ° C. for 8 hours. Then 450 g of water were added and the methanol was distilled off as completely as possible. The dispersion obtained was adjusted from pH 1 3 to pH 5 with 321 g of 37% hydrochloric acid and stirred at room temperature for 2 hours. The precipitated product was filtered off, washed and dried at 60 ° C in a vacuum.
  • the entire batch was poured onto 600 g of ice water, stirred for 1 2 hours and adjusted to pH 5 with sodium hydroxide solution.
  • the toluene phase was separated off, the water phase was extracted a further 3 times with 50 mol of toluene each.
  • the combined toluene extracts were evaporated to dryness.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

L'invention concerne une nouvelle 2-alcoxy-5-méthoxypyrimidine, ou ses formes tautomères, ainsi que le procédé de fabrication de ces produits. La 2-alcoxy-5-méthoxypyrimidine ou ses formes tautomères peut être synthétisée à partir de stades antérieurs simples, avec un petit nombre d'étapes de réaction et avec des rendements élevés.
EP01931613A 2000-04-19 2001-04-17 2-alcoxy-5-methoxypyrimidine ou ses formes tautomeres, ainsi que leur procede de fabrication Withdrawn EP1274690A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10019291A DE10019291C2 (de) 2000-04-19 2000-04-19 2-Alkoxy-5-methoxypyrimidine bzw. deren tautomere Formen sowie Verfahren zu deren Herstellung
DE10019291 2000-04-19
PCT/EP2001/004345 WO2001081320A1 (fr) 2000-04-19 2001-04-17 2-alcoxy-5-methoxypyrimidine ou ses formes tautomeres, ainsi que leur procede de fabrication

Publications (1)

Publication Number Publication Date
EP1274690A1 true EP1274690A1 (fr) 2003-01-15

Family

ID=7639240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01931613A Withdrawn EP1274690A1 (fr) 2000-04-19 2001-04-17 2-alcoxy-5-methoxypyrimidine ou ses formes tautomeres, ainsi que leur procede de fabrication

Country Status (4)

Country Link
US (1) US6620932B2 (fr)
EP (1) EP1274690A1 (fr)
DE (1) DE10019291C2 (fr)
WO (1) WO2001081320A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2366752B1 (fr) * 2003-10-22 2016-07-20 Merck Patent GmbH Nouveaux matériaux pour l'électroluminescence et leur utilisation
US9132119B2 (en) * 2008-04-18 2015-09-15 Medtronic, Inc. Clonidine formulation in a polyorthoester carrier
CN114539103B (zh) * 2022-03-21 2023-04-07 佳木斯黑龙农药有限公司 2-二氟乙氧基-6-三氟甲基苯磺酰氯的合成方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2348213A1 (fr) * 1976-04-16 1977-11-10 Bellon Labor Sa Roger Procede pour la preparation de l'ethoxycarbonyl-6 ethyl-8 methoxy-2 oxo-5 dihydro-5,8 pyrido(2,3-d) pyrimidine
DE3441369A1 (de) * 1984-11-13 1986-05-22 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von hydroxymethylen-alkoxyessigsaeureestern
DE4029648A1 (de) 1990-09-19 1992-03-26 Hoechst Ag 4-anilino-pyrimidine, verfahren zu ihrer herstellung, sie enthaltende mittel und ihre verwendung als fungizide
CN1172934C (zh) * 2000-06-16 2004-10-27 美国陶氏益农公司 制备2-氨基-5,8-二甲氧基[1,2,4]三唑[1,5-c]嘧啶的方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0181320A1 *

Also Published As

Publication number Publication date
DE10019291C2 (de) 2002-04-04
US20030022908A1 (en) 2003-01-30
WO2001081320A1 (fr) 2001-11-01
DE10019291A1 (de) 2001-10-31
US6620932B2 (en) 2003-09-16

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