Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
  • C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
  • C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
  • C07D311/42—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4
  • C07D311/44—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3
  • C07D311/54—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4 with one hydrogen atom in position 3 substituted in the carbocyclic ring
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/10—Antimycotics
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/582—Recycling of unreacted starting or intermediate materials

Definitions

• This invention relates to new methods for preparing chemical compounds, in particular fungicidal compounds, especially iodinated derivatives of chromones, preferably compounds of formula (I), and intermediate compounds useful for these methods.
• the subject of the present invention is also a method for preparing vinylalkoxides from vinylamines; it relates more particularly to the preparation of 2-halo and 2-alkoxychromones by the reaction of a 2- aminochromone with a copper halide or alkoxide.
• the subject of the present invention is also a method for preparing 2- aminochromones by reacting an alkyl salicylate with an alkylnitrile and a base, followed by cyclization in an aqueous acid medium.
• EP-861 242 which relates to fungicidal compounds derived from coumarin or chromone, generically reviews methods for preparing some of these compounds. However, even though two examples of iodinated compounds are disclosed, no specific method for preparing such iodinated derivatives is mentioned, nor is such an improved method suggested.
• the present invention makes it possible to solve all or some of these problems or disadvantages. It makes it possible in particular to avoid or to limit the substitution of halogen atoms by an alcoholate group when it is present, in particular when the structure comprises two halogen atoms.
• a first aspect of the invention relates to the preparation of a compound of formula (I)
• step A reaction of a compound of formula (V)
• step B compound of formula (IV) which is then cyclized in an aqueous acid medium to form the compound of formula (III):
• step C compound of formula (III) which gives the compound of formula (II) via a diazotization reaction by means of a compound chosen from sodium nitrite in the form of a mixture with an acid, alkyl nitrites, alkyl thionitrites and alkyl thionitrates, and decomposition by means of a compound AZ n ;
• step D compound of formula (II) which gives the compound of formula (I) by the action of an alcohol in the form of a mixture with a base; in the formulae (I) to (V)
• R 1 , R 2 , R 3 and R 4 which are identical or different, represent a d- C 10 alkyl, C 1 -C 10 alkenyl or C1-C10 alkynyl, one or more carbo- or heterocycles having 5 to 7 atoms, it being possible for these groups to be substituted or unsubstituted;
• A represents a metal or a metal salt
• Z represents a group chosen from CI, Br or -OR 3 ;
• n is equal to 0, 1 or 2.
• R 1 noncyclic substituents or optionally aromatic cyclic substituents are preferred, and for Z, CI is preferred.
• the groups or radicals of the compounds of formula (I) to (V) are substituted, they are preferably substituted with one or more groups which may be chosen, independently of each other, from an alkyl radical, alkenyl radical, alkynyl radical, a halogen atom, a cyano radical, trialkylsilyl radical, alkoxy radical, alkylthio radical, hydroxyl radical, nitro radical, amino radical, acyl radical, acyloxy radical, phenyl radical, heterocyclyl radical, phenylthio radical, phenoxy radical, heterocyclyloxy radical, heterocyclylthio radical and oxidized and optionally substituted derivatives of chemical entities containing a thio group.
• groups which may be chosen, independently of each other, from an alkyl radical, alkenyl radical, alkynyl radical, a halogen atom, a cyano radical, trialkylsilyl radical, alkoxy radical, alkylthio radical, hydroxyl radical
• heterocyclyl comprises heteroaryi groups and nonaromatic heterocyclyl groups, which may be saturated or unsaturated.
• the heteroaryi groups are generally 5- or 6-membered rings containing up to 4 heteroatoms chosen from nitrogen, oxygen and sulfur, optionally fused with a benzene ring.
• heteroaryi groups there may be mentioned groups derived from thiophene, furan, pyrrole, thiazole, oxazole, imidazole, isothiazole, oxazole, pyrazole, 1 ,3,4-oxadiazole, 1 ,3,4- thiadiazole, 1 ,2,4-oxadiazole, 1,2,4-thiadia ⁇ ole, 1 ,2,4-triazole, 1 ,2,3- triazole, tetrazole, benzo[b]thiophene, benzo[b]furan, indole, benzo[c]thiophene, benzo[c]furan, isoindole, benzoxazole, ben ⁇ othia ⁇ ole, benzimidazole, benzisoxazole, benzisothiazole, indazole, benzothiadiazole, benzotriazole, dibenzofuran, diben ⁇ othiophen
• the nonaromatic heterocyclyl groups are generally 3-, 5-, 6- or 7- membered rings containing up to 3 heteroatoms chosen from nitrogen, oxygen and sulfur, for example oxiranyl, thiiranyl, thiazolinyl, dioxolanyl, 1 ,3-benzoxazinyl, 1 ,3-benzothiazinyl, morpholino, pyrazolinyl, sulfolanyl, dihydroquinazolinyl, piperidinyl, phthalimido, tetrahydrofuranyl, tetrahydropyranyl, pyrrolidinyl, indolinyl, 2-oxopyrrolidino, 2- oxobenzoxazolin-3-yl or tetrahydroazepinyl.
• the substituents, when they are present, on the phenyl or heterocyclyl groups may be for example halogen atoms, CN, NO 2 , SF5, B(OH) 2 , trialkylsilyl, acyl, O-acyl or a radical E, OE or S(0) n E as defined above for R 1 or alternatively an optionally substituted amino radical; or alternatively two adjacent groups on the ring, together with the atoms to which they are attached form a carbocyclic or heterocyclic ring, which may be optionally substituted in a similar manner.
• acyl comprises acid residues containing sulfur or phosphorus and carboxylic acid residues.
• amino radicals may be substituted for example with one or two optionally substituted alkyl or optionally substituted acyl radicals, or alternatively two substituents may form a ring, preferably a 5- to 7-membered ring, which may be substituted and which may contain other heteroatoms, such as for example morpholine.
• substituents may form a ring, preferably a 5- to 7-membered ring, which may be substituted and which may contain other heteroatoms, such as for example morpholine.
• steps A and B as well as the combination of steps C and D, taken separately constitute methods which also form part of the present invention as such.
• the reagents, the reaction conditions and the optional variant steps are similar to those described for the method of the invention comprising steps A to D.
• the compounds of formula (V) may be prepared in a manner similar to what has been reported in the literature for alkyl 3-halosalicylates from equivalent alkyl salicylates, see for example Pharm. J., (1947), 159, 182.
• a homogeneous or heterogeneous inorganic or organic base preferably a lithium alkylamide, for example lithium diisopropylamide, is advantageously used.
• the base useful for this step may consist of a mixture of such bases. Persons skilled in the art will know how to determine the number and the relative quantities of these bases used as a mixture.
• the compound of formula (IV) can be characterized but is generally not isolated.
• the nitrile of formula R 1 CH 2 CN may be replaced by a nitrile of formula R 1 CXHCN in which X represents a halogen atom and the base is then replaced by a metal, in particular magnesium or zinc, see in particular Synth. Commun. (1989), 19(9-10), 1649-53.
• step B the compound of formula (IV) gives the compound of formula (111).
• An inorganic or organic acid is used; ammonium chloride, hydrochloric acid or acetic acid are suitable.
• Aqueous acetic acid is
• step C the compound of formula (III) gives the compound of formula (II) via a diazotization reaction, see for example March's Advanced Organic Chemistry, 5 th edition, John Wiley & Sons, Inc. (2001), p.816, followed by a decomposition reaction.
• the diazo intermediate may be decomposed by means of a compound AZ n chosen from a metal halide or alkoxide, preferably CuCI, CuBr, CuC- 2 , CuBr 2 , CuOR 3 or Cu(OR 3 ) 2 ; CuCI 2 and CuBr 2 may also be used in their hydrated form.
• AZ n chosen from a metal halide or alkoxide
• this step C A therefore preferably represents copper.
• Other metals useful for this step are mentioned in Chem. Rev., (1988), 88, 765-792.
• This step C may also be carried out using NaNO 2 with CISiMe 3 in order to prepare a compound in which Z represents CI; persons skilled in the art will know how to adapt the conditions for such a Sandmeyer reaction known per se (Tet. Letters, 33 (22), 3167-3168 (1992)).
• NaN0 2 as a mixture with copper metal and KI may be used during this step C, in this case Z represents I.
• HBF as a mixture with NaN0 2 may be used.
• Z then represents F.
• step D the compounds of formula (II) give the compound of formula (I).
• An alcohol of formula R 2 OH in which R 2 represents a group such as those defined above, preferably a C 1 -C 10 alkyl, still more preferably an n-butyl group, is used.
• R 2 represents a group such as those defined above, preferably a C 1 -C 10 alkyl, still more preferably an n-butyl group.
• the choice of the base used to form the alcoholate is within the capability of persons skilled in the art who may in particular use an alkali or alkaline-earth metal hydroxide or hydride, an alkali metal or an alkaline-earth metal, preferably KOH, NaH or sodium metal.
• Another aspect of the present invention relates to a further improved method for preparing this same compound of formula (I) obtained directly by diazotization and decomposition of a compound of formula (III) by means of a compound AZ n which is preferably a metal alkoxide.
• steps C and D of the method of the invention are replaced by a single step C.
• step D Another variant of the method of the invention consists in replacing step D with step D'.
• a compound of formula (II) in which Z represents a group -OR 3 is used, it is then possible to displace this group by a more appropriate similar group.
• Z represents a group -OR 3
• Z is an ethoxy group
• the use of such a substitution constitutes an additional method of the present invention for the preparation of a compound of formula (I) starting from a compound of formula (II).
• R 1 represents a C 1 -C 1 0 alkyl, preferably an n-propyl
• R 2 represents a C 1 -C 10 alkyl, preferably an n-butyl
• R 4 represents a C 1 -C 10 alkyl, preferably a methyl
• Z represents a halogen atom, preferably CI or Br, more preferably CI, or the group -OR 3 in which R 3 represents a methyl or n-butyl group.
• the- methods of the invention are used for the preparation of a compound of formula (I) in which R 1 represents an n-propyl and R 2 represents an n-butyl.
• An additional aspect of the present invention relates to intermediate compounds useful for the methods of preparation according to the invention.
• intermediate compounds of formula (III) there are preferred those in which the following characteristics are present alone or in combination: o the iodine atom is in the 6-position of the chromone; o R 1 represents a C 1 -G 10 alkyl group, preferably an n-propyl group.
• R 1 represents a C-1-C- 10 alkyl group
• Z represents a halogen atom. More preferably, R 1 represents an n-propyl group and Z represents chlorine or bromine.
• the suspension is heated to 5°C and kept stirring for 45 minutes and then hydrolyzed with 15 ml of a saturated aqueous NH 4 CI solution.
• the biphasic solution is kept stirring for 2 hours.
• the aqueous phase is then removed, the organic phase is washed with 2x20 ml of water and then 20 ml of a saturated aqueous NaCI solution.
• the organic phase is dried over MgSO 4 , filtered and concentrated to dryness, which gives 7.25 g of a yellow solid (70%).
• the product crystallized from acetonitrile has a melting point of 186-188°C.

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• 2003
  • 2003-02-03 EP EP03356014A patent/EP1443044A1/fr not_active Withdrawn
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