EP1529029A1 - Procede de production d'esters d'acide 3,amino-4,4,4-trifluorocrotonique - Google Patents

Procede de production d'esters d'acide 3,amino-4,4,4-trifluorocrotonique

Info

Publication number
EP1529029A1
EP1529029A1 EP03787790A EP03787790A EP1529029A1 EP 1529029 A1 EP1529029 A1 EP 1529029A1 EP 03787790 A EP03787790 A EP 03787790A EP 03787790 A EP03787790 A EP 03787790A EP 1529029 A1 EP1529029 A1 EP 1529029A1
Authority
EP
European Patent Office
Prior art keywords
mol
acid
alkyl
formula
reaction
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Withdrawn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
EP03787790A
Other languages
German (de)
English (en)
Inventor
Thomas GÜTHNER
Doris Krammer
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.)
Alzchem Trostberg 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 EP1529029A1 publication Critical patent/EP1529029A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C227/04—Formation of amino groups in compounds containing carboxyl groups
    • C07C227/06—Formation of amino groups in compounds containing carboxyl groups by addition or substitution reactions, without increasing the number of carbon atoms in the carbon skeleton of the acid
    • C07C227/08—Formation of amino groups in compounds containing carboxyl groups by addition or substitution reactions, without increasing the number of carbon atoms in the carbon skeleton of the acid by reaction of ammonia or amines with acids containing functional groups

Definitions

  • the present invention relates to a process for the preparation of 3-amino-4,4,4-tfluorcrotonic esters or their E / Z isomers or tautomeric forms.
  • 3-amino-4,4,4-trifluorocrotonic esters are important intermediates for the production of biologically active substances, in particular crop protection agents (cf. US 6,207,830 or JP 2002-003480).
  • 3-amino-4,4,4-trifluorocrotonic esters is known in principle.
  • 4,4,4-trifluoroacetoacetic acid ester with amines under dehydrating conditions optionally in
  • JP-OS 06321877 JP-OS 05140060 or A.N. Fomin et. al., Zh. Org. Khim. 22, 1603 (1986).
  • the object of the present invention was therefore to develop an economical process for the preparation of 3-amino-4,4,4-trifluorocrotonic esters of the general formula (I)
  • R 1 and R 2 H, optionally substituted linear dC 4 alkyl or benzyl and
  • R 3 methyl or ethyl, which does not have the disadvantages mentioned in the prior art, but instead, with the corresponding 3-amino-4,4,4-trifluorocrotonic esters in high yields, starting from inexpensive raw materials and with little outlay on equipment can be produced inexpensively.
  • This object was achieved in that a) reacting an alkyl trifluoroacetate with an alkyl acetate of the formula CH3-CO-OR 3 and an alkali metal alcoholate to give an enolate of a trifluoroacetoacetic acid ester of the formula (II)
  • R 3 has the meaning given above, and then
  • a trifluoroacetic acid alkyl ester is reacted with an ethyl acetate in the presence of an alkali metal alcoholate in a manner known per se (cf. J. Burdon et. Al., Tetrahedron 20, 216 (1964)) in the first step a).
  • a molar ratio of alkyl trifluoroacetate to alkyl acetate is preferred from 1: 1 to 1: 5, excess alkyl acetate being able to serve as a solvent.
  • the trifluoroacetic acid alkyl ester and ethyl acetate the methyl esters or ethyl esters are preferably used.
  • Reaction stage a) is carried out with the addition of 0.9 to 3 mol, preferably 1.0 to 1.5 mol, of an alkali metal alcoholate per mol of alkyl trifluoroacetate.
  • the alkali metal alcoholate can be used in solid form or as an alcoholic solution. Sodium methylate, sodium ethylate, potassium methylate and potassium ethylate are preferred, an alcoholate of the alcohol corresponding to the esters being preferred.
  • the reaction can take place at a temperature of 0 to 100 ° C.
  • reaction stage a) a suspension or solution of an alkali enolate of the trifluoroacetoacetic acid ester according to formula (II) is obtained,
  • R 3 has the meaning given above.
  • reaction step a) the trifluoroacetoacetic acid ester (or its hydrate, hemiacetals or acetals) is not released, isolated and purified, as in the known processes, but rather that the crude alkali enolate of the trifluoroacetoacetic acid ester is used directly for the subsequent reaction step b).
  • reaction stages a) and b) are carried out in succession in the same reaction vessel.
  • R 1 and R 2 independently of one another have the following meanings: hydrogen, a linear C 1 -C 4 -alkyl radical or a benzyl radical.
  • the alkyl radical or the benzyl radical can be substituted, whereby substituent groups are preferably linear or branched alkyl, alkenyl or alkynyl groups which optionally include one or more heteroatoms (O, S or N) and each have at most 10 carbon or heteroatoms.
  • Preferred amines are ammonia, methylamine, ethylamine, benzylamine, dimethylamine and diethylamine.
  • the amine in the context of the present invention it is possible to use the amine as the free base in anhydrous form or in aqueous solution.
  • a salt thereof with an inorganic or organic acid can also be used.
  • Preferred salts are the hydrochlorides, sulfates, nitrates, formates and acetates of the corresponding amine.
  • the reaction of the crude alkali enolate of the trifluoroacetoacetic acid ester with the amine of the formula NHR 1 R 2 is preferably carried out in the presence of an excess of an acid, ie at a pH ⁇ 7.
  • preferred Acids are common organic or inorganic acids, e.g. As hydrochloric acid, anhydrous hydrogen chloride, sulfuric acid, nitric acid, formic acid or acetic acid.
  • acetic acid and / or hydrochloric acid is to be regarded as preferred.
  • 1.0 to 10.0, preferably 1.1 to 4.0 mol of amine of the formula NHR 1 R 2 (or a salt thereof) are typically used per mole of alkyl trifluoroacetic acid used.
  • the molar amount of the acid to be used depends on the amount of alkali metal alcoholate originally used and the amount of amine used and is typically 1.0 to 10.0, preferably 1.1 to 4.0 mol per mol of trifluoroacetic acid alkyl ester used.
  • the amount of acid contained in the amine salt used must be taken into account.
  • a molar amount of acid is preferably used which is greater than the number which is calculated from the moles of alkali metal alcoholate plus the moles of amine minus the moles of trifluoroacetic acid alkyl ester originally used.
  • the reaction is preferably carried out with continuous removal of the water of reaction formed. This can e.g. B. by distilling off the water of reaction at the reaction temperature, optionally under reduced pressure. According to a particular embodiment, the separation of the water of reaction is facilitated by an inert entrainer.
  • Preferred entraining agents are hydrocarbons in the Boiling range between 50 and 150 ° C, for example hexane, octane, cyclohexane, methylcyclohexane, benzene, toluene and xylenes.
  • the reaction mixture obtained is, if appropriate after an extraction of by-products (alkali metal salts, amine salts and acids), freed by filtration and / or washing with water and then subjected to an optionally multi-stage fractional distillation under atmospheric pressure or reduced pressure.
  • by-products alkali metal salts, amine salts and acids
  • the desired 3-amino-4,4,4-trifluorocrotonic acid ester is obtained as a distillate in good yield and high purity.
  • the suspension was heated to boiling, the water was separated off from the distillate which had separated out and the cyclohexane was returned to the
  • the suspension was heated to boiling, the water was separated from the distillate which had separated out and the cyclohexane was returned to the reaction mixture. After 4 hours no more water separated out, the reaction was stopped.
  • the suspension obtained was filtered at 20 ° C., washed twice with 100 ml of cyclohexane and the cyclohexane was distilled off.
  • the crude product obtained was fractionated at 430 mbar and about 120 ° C. over a packed column. 140.4 g of pure 3-methylamino-4,4,4-trifluorocrotonic acid ethyl ester with a content of 98.8% were obtained. The yield was 71%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention concerne un procédé permettant de produire des esters d'acide 3-amino-4,4,4-trifluorocrotonique de formule (I) et leurs isomères Z/E ou leurs formes tautomères. R<1> et R<2> désignent indépendamment l'un de l'autre, hydrogène, un reste alkyle C1-C4 linéaire éventuellement substitué ou un reste benzyle éventuellement substitué et R<3> désigne méthyle ou éthyle. Ledit procédé se caractérise en ce que a) un ester d'acide trifluoro-acétique est mis à réagir avec un ester d'alkyle d'acide acétique de formule CH3-CO-OR<3> et un alcoolat de métal alcalin pour former un énolate d'ester d'acide trifluoroacétacétique de formule (II). M désigne sodium ou potassium et R<3> a la signification précitée et pour finir, b) l'énolate alcalin d'ester trifluoroacétacétique de l'étape a) est mis à réagir, sans quelconque purification, directement avec une amine de formule NHR<1>R<2>, en présence d'un acide pour former l'ester d'acide 3-amino-4,4,4-trifluorocrotonique. Ce procédé à deux étapes permet de produire des rendements élevés d'esters d'acide 3-amino-4,4,4-trifluorocrotonique, sans produits secondaires significatifs.
EP03787790A 2002-08-14 2003-08-13 Procede de production d'esters d'acide 3,amino-4,4,4-trifluorocrotonique Withdrawn EP1529029A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10237285 2002-08-14
DE10237285A DE10237285A1 (de) 2002-08-14 2002-08-14 Verfahren zur Herstellung von 3-Amino-4,4,4-trifluorcrotonsäureestern
PCT/EP2003/009006 WO2004016579A1 (fr) 2002-08-14 2003-08-13 Procede de production d'esters d'acide 3,amino-4,4,4-trifluorocrotonique

Publications (1)

Publication Number Publication Date
EP1529029A1 true EP1529029A1 (fr) 2005-05-11

Family

ID=30775278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03787790A Withdrawn EP1529029A1 (fr) 2002-08-14 2003-08-13 Procede de production d'esters d'acide 3,amino-4,4,4-trifluorocrotonique

Country Status (6)

Country Link
US (1) US7002038B2 (fr)
EP (1) EP1529029A1 (fr)
JP (1) JP2005535713A (fr)
AU (1) AU2003263217A1 (fr)
DE (1) DE10237285A1 (fr)
WO (1) WO2004016579A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103113249B (zh) * 2013-03-05 2015-06-03 上虞盛晖化工股份有限公司 一种3-氨基-4,4,4-三氟丁烯酸乙酯的合成方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647689A (en) * 1982-07-30 1987-03-03 Monsanto Company Preparation of alkyl trifluoroacetoacetate
FR2583415B1 (fr) * 1985-06-14 1987-08-14 Rhone Poulenc Spec Chim Procede de preparation de trifluoroacetoacetate d'ethyle.
US4704317A (en) * 1985-10-02 1987-11-03 Minnesota Mining And Manufacturing Company Sheetstock dispensable from a corner nip feeder
JPH05140060A (ja) * 1991-11-13 1993-06-08 Nissan Chem Ind Ltd ３−置換アミノ−４，４，４−トリフルオロクロトン酸エステルの製造法
JP3317309B2 (ja) * 1993-05-12 2002-08-26 日産化学工業株式会社 ３−置換アミノ−４，４，４−トリフルオロクロトン酸エステルの製造法
AU728589B2 (en) * 1996-05-22 2001-01-11 Dow Agrosciences Llc A method for preparing 3-amino substituted crotonates
US5777154A (en) * 1996-11-14 1998-07-07 Rohm And Haas Company Method for preparing 3-amino substituted crotonates
ZA974317B (en) 1996-05-22 1997-11-24 Rohm & Haas A method for preparing 3-amino substituted crotonates.
EP0831091A3 (fr) * 1996-09-23 1998-04-15 Novartis AG Procédé de préparation de 3-aryl-uraciles
DE19741411A1 (de) * 1996-09-23 1998-03-26 Ciba Geigy Ag Verfahren zur Herstellung von 3-Aryluracilen
JP2001522825A (ja) * 1997-11-07 2001-11-20 ゾルファイ フルーオル ウント デリヴァーテ ゲゼルシャフト ミット ベシュレンクテル ハフツング アミノハロゲンクロトネートの製造方法
US6191275B1 (en) * 1999-02-16 2001-02-20 American Cyanamid Company Process for the preparation of 6-(perfluoroalkyl) uracil compounds form urea compounds
US6355796B1 (en) * 1999-02-16 2002-03-12 Basf Aktiengesellschaft Processes and intermediate compounds for the preparation of 2-(N,N-disubstituted) amino-4-(perfluoroalkyl)-1, 3- oxazin-6-one and 6-(perfluoroalkyl) uracil compounds
KR20010114208A (ko) * 1999-02-16 2001-12-31 윌리암 에이취 캘넌, 에곤 이 버그 우레아 화합물로부터의 6-(과플루오로알킬)우라실화합물의 제조 방법
US6405167B1 (en) * 1999-07-16 2002-06-11 Mary Ann Cogliano Interactive book
AU2002235247A1 (en) * 2000-12-29 2002-07-16 Honeywell International, Inc. Halogenated-alpha,beta-unsaturated-beta-(substituted-amino) carboxylate esters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004016579A1 *

Also Published As

Publication number Publication date
US20050182272A1 (en) 2005-08-18
AU2003263217A1 (en) 2004-03-03
DE10237285A1 (de) 2004-02-26
WO2004016579A1 (fr) 2004-02-26
JP2005535713A (ja) 2005-11-24
US7002038B2 (en) 2006-02-21

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