Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
  • C07C303/36—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids
  • C07C303/40—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids by reactions not involving the formation of sulfonamide groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C231/00—Preparation of carboxylic acid amides
  • C07C231/02—Preparation of carboxylic acid amides from carboxylic acids or from esters, anhydrides, or halides thereof by reaction with ammonia or amines
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B61/00—Other general methods
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C331/00—Derivatives of thiocyanic acid or of isothiocyanic acid
  • C07C331/02—Thiocyanates

Definitions

• the present invention relates to a method for producing an N-(hetero)aryl(meth)acrylamide compound.
• N-(hetero)aryl(meth)acrylamide compounds are used in various fields as highly functional polymers.
• 4-sulfamoylphenyl methacrylamide is used in drug delivery systems in medical applications, and is also used in lithographic printing plates to improve solvent resistance, alkali resistance, and the like.
• the N-(hetero)aryl(meth)acrylamide compound can be obtained by reacting (amidation reaction) a (meth)acrylic acid compound and an N-(hetero)arylamine compound.
• Various methods have already been proposed for this amidation reaction itself, and known examples include the symmetric acid anhydride method, the mixed acid anhydride method, the acid chloride method, the condensing agent method, and the amine activation method. .
• (meth)acrylic acid is converted into an anhydride and activated, and this (meth)acrylic anhydride is reacted with an N-(hetero)arylamine compound to form an N-(hetero)aryl (meth ) to obtain an acrylamide compound (for example, Patent Document 1).
• an N-(hetero)arylamine compound for example, N-(hetero)aryl (meth )
• Patent Document 1 an N-(hetero)arylamine compound
• one of the two (meth)acrylic acid components constituting this anhydride becomes (meth)acrylic acid as a by-product. Therefore, it is necessary to separate and remove a large amount of (meth)acrylic acid as a by-product, which imposes a large environmental load.
• (meth)acrylic anhydride is a relatively expensive reagent, and there are restrictions in terms of cost.
• (meth)acrylic acid is reacted with, for example, chloroformate to prepare a mixed acid anhydride that is an activated form of (meth)acrylic acid.
• chloroformate By reacting this mixed acid anhydride with an N-(hetero)arylamine compound, an N-aryl(meth)acrylamide compound can be obtained (eg Patent Document 2).
• the chloroformate is a by-product. Therefore, after the reaction, it is necessary to separate and remove a large amount of by-products, which is also a technique with a large environmental load.
• (meth)acryloyl chloride which is an activated form of (meth)acrylic acid, is reacted with an N-(hetero)arylamine compound to obtain an N-(hetero)aryl(meth)acrylamide compound.
• (Meth)acryloyl chloride is expensive, and the acid chloride method has cost limitations.
• (meth)acrylic acid is activated with a condensing agent and reacted with an N-(hetero)arylamine compound to obtain an N-(hetero)aryl(meth)acrylamide compound (eg Patent Document 4).
• Condensing agents are generally expensive reagents, and it is necessary to separate and remove condensing agent residues after the reaction. As a result, the operation becomes complicated and the environmental load increases.
• an anion is generated and activated on the amino group of the N-(hetero)arylamine compound using an organic metal reagent such as n-butyllithium, and then reacted with a (meth)acrylic acid compound.
• an N-(hetero)aryl(meth)acrylamide compound is obtained.
• organometallic reagents are water-reactive and may ignite, so this reaction must be carried out at extremely low temperatures. This method is therefore difficult to scale up to industrial production levels.
• the following problems also occur in the reaction between the (meth)acrylic acid compound and the N-(hetero)arylamine compound. That is, in addition to the desired N-(hetero)aryl(meth)acrylamide compound (1,2-adduct), the N-(hetero)arylamine compound reacts with the double bond site of the (meth)acrylic acid compound.
• the problem is that a large amount of by-products (1,4-adducts) are produced.
• Patent Document 5 proposes conducting the reaction in the presence of a catalytic amount of tin dialkylate.
• Patent Document 6 also proposes to synthesize an N-aryl(meth)acrylamide compound by activating a (meth)acrylic acid ester with a Lewis acid.
• the N-(hetero)arylamine compound has a structure in which the ring-constituting atoms of the aromatic ring have an electron-withdrawing group as a substituent (for example, sulfanilamide). It has been found that the problem of selectivity becomes more pronounced, and the amount of 1,4-adducts produced far exceeds the amount of the desired 1,2-adducts produced.
• An N-(hetero)aryl(meth)acrylamide compound obtained from an N-(hetero)arylamine compound having such an electron-withdrawing group can be industrially important compounds are known.
• the present invention relates to the production of an N-(hetero)aryl(meth)acrylamide compound comprising reacting a (meth)acrylic acid compound with an N-(hetero)arylamine compound, wherein As the amine compound, the ring-constituting atoms of the aromatic ring have an electron-withdrawing group as a substituent, while sufficiently suppressing the formation of the 1,4-adduct as a by-product to achieve the desired N-(hetero) Disclosed is a method for producing an N-(hetero)aryl(meth)acrylamide compound, capable of obtaining an aryl(meth)acrylamide compound with high selectivity and appropriately suppressing the cost and environmental load caused by raw materials and reagents.
• the task is to provide
• a compound represented by the following general formula (1) and a compound represented by the following general formula (2) are reacted at a temperature exceeding 120° C. to amidate to obtain a compound represented by the following general formula (3).
• a method for producing an N-(hetero)aryl(meth)acrylamide compound comprising: In each formula, R1 represents a hydrogen atom or an aliphatic group. R2 represents a hydrogen atom, chain aliphatic group, aliphatic hydrocarbon ring group, aryl group or heterocyclic group. Ar represents an aromatic ring. R3 represents an electron-withdrawing group, and m is an integer of 1 or more.
• R4 represents a chain aliphatic group, an aliphatic hydrocarbon ring group, an aryl group or a heterocyclic group, and n is an integer of 0 or more. However, R 4 is never an ⁇ -hydroxybenzyl group.
• the maximum value of m+n is the maximum number of substituents that the ring-constituting atoms of Ar can have.
• a numerical range represented by "-" means a range including the numerical values before and after "-" as lower and upper limits.
• substituents for which substitution or non-substitution is not explicitly stated mean that the group may have any substituent as long as the desired effect is not impaired. This also applies to compounds that are not specified as substituted or unsubstituted.
• substituted or unsubstituted when simply referred to as a "substituent", a group selected from Substituent Group Z, which will be described later, can be preferably applied.
• the preferred form is the corresponding group of the substituent group Z (in the above case is an alkyl group), and the preferred ranges and specific examples apply.
• this carbon number means the carbon number of the group as a whole.
• this group further has a substituent, it means the total number of carbon atoms including this substituent.
• the term " ⁇ compound” when used, a compound having a common basic skeleton but with a part of the structure changed within the range of achieving the desired effect (e.g., some hydrogen atoms are replaced with substituents It is a meaning including things).
• the term “(meth)acrylic acid compound” means, in addition to (meth)acrylic acid, a compound derived from (meth)acrylic acid to the extent that the desired effect is achieved.
• (hetero)aryl(meth)acrylamide compounds” includes compounds derived from N-(hetero)aryl(meth)acrylamides, in addition to N-(hetero)aryl(meth)acrylamides, to the extent that the intended effect is achieved.
• (meth)acrylic means to include both methacrylic and acrylic structures.
• (meth)acrylic acid compound means a methacrylic acid compound and/or an acrylic acid compound.
• methacryl (methacryloyl) is used.
• methacrylic acid compounds can be considered to be included in acrylic acid compounds, but "(meth)acrylic” is a common expression in the chemical field. Considering this, the expression “(meth)acrylic” is used.
• (hetero)aryl is meant to include both heteroaryl (aromatic heterocyclic group) and aryl (aromatic hydrocarbon ring group) structures.
• the N-(hetero)arylamine compound as a raw material a 1,4-adduct as a by-product is used while the ring-constituting atoms of the aromatic ring have an electron-withdrawing group as a substituent. can be sufficiently suppressed, and the desired N-(hetero)aryl(meth)acrylamide compound can be obtained with high selectivity.
• the present invention there is no need to use expensive activators or special reagents in the production of N-(hetero)aryl(meth)acrylamide compounds, so the costs and environmental impacts resulting from raw materials and reagents are appropriately reduced. be able to.
• a compound [(meth)acrylic acid compound] represented by the following general formula (1) and a compound [N-(hetero)arylamine compound] represented by the following general formula (2) are heated at 120°C.
• R 1 represents a hydrogen atom or an aliphatic group.
• the aliphatic group that can be used as R 1 may be a saturated aliphatic group or an unsaturated aliphatic group.
• the number of carbon atoms in the aliphatic group that can be used as R 1 is preferably 1 to 20, more preferably 1 to 18, still more preferably 1 to 15, still more preferably 1 to 12, still more preferably 1 to 10, and 1 to 8. More preferably, 1 to 6 are more preferable, and 1 to 5 are even more preferable.
• the aliphatic group that can be used as R 1 is preferably an aliphatic hydrocarbon group. This aliphatic hydrocarbon group is more preferably an alkyl group, an alkenyl group or an alkynyl group.
• the alkyl group that can be used as R 1 may be linear or branched, and may form a ring.
• the number of carbon atoms in the alkyl group is preferably 1 to 20 (when the alkyl group has a ring structure (cycloalkyl group), the lower limit of the number of carbon atoms is 3, preferably 4, more preferably 5. The same applies hereinafter. ), more preferably 1 to 18, more preferably 1 to 15, more preferably 1 to 12, more preferably 1 to 10, more preferably 1 to 8, more preferably 1 to 6, and 1 to 5 is also preferred.
• An alkyl group that can be used as R 1 is preferably an unsubstituted alkyl group or trifluoromethyl.
• the alkyl group that can be used as R 1 is more preferably methyl, trifluoromethyl, ethyl, propyl or butyl, still more preferably methyl, trifluoromethyl or ethyl, particularly preferably methyl.
• the alkenyl group that can be used as R 1 may be linear or branched, and may form a ring.
• the number of carbon atoms in the alkenyl group is preferably 2 to 20 (when the alkenyl group has a ring structure (cycloalkenyl group), the lower limit of the number of carbon atoms is 3, preferably 4, more preferably 5.
• the same applies hereinafter. more preferably 2 to 18, more preferably 2 to 15, more preferably 2 to 12, more preferably 2 to 10, more preferably 2 to 8, more preferably 2 to 6, and 2 to 5 is also preferred.
• An alkenyl group that can be used as R 1 is preferably an unsubstituted alkenyl group.
• the alkenyl group that can be used as R 1 is more preferably vinyl, allyl or dimethylallyl.
• the alkynyl group that can be used as R 1 may be linear or branched, and may form a ring.
• the number of carbon atoms in the alkynyl group is preferably 2 to 20 (when the alkynyl group has a ring structure (cycloalkynyl group), the lower limit of the number of carbon atoms is 3, preferably 4, more preferably 5.
• the same applies hereinafter. more preferably 2 to 18, more preferably 2 to 15, more preferably 2 to 12, more preferably 2 to 10, more preferably 2 to 8, more preferably 2 to 6, and 2 to 5 is also preferred.
• An alkynyl group that can be used as R 1 is preferably an unsubstituted alkynyl group.
• the alkynyl group that can be used as R 1 is more preferably ethynyl or propynyl.
• R 1 is preferably a hydrogen atom or methyl.
• R2 represents a hydrogen atom, a chain aliphatic group, an aliphatic hydrocarbon ring group, an aryl group or a heterocyclic group.
• the chain aliphatic group that can be used as R 2 may be a chain saturated aliphatic group or a chain unsaturated aliphatic group.
• the number of carbon atoms in the chain aliphatic group that can be taken as R 2 is preferably 1 to 20, more preferably 1 to 18, still more preferably 1 to 15, still more preferably 1 to 12, still more preferably 1 to 10, further preferably 1 to 8 is more preferred, 1 to 6 are more preferred, and 1 to 5 are even more preferred.
• a chain aliphatic group that can be used as R 2 is preferably a chain aliphatic hydrocarbon group. This chain aliphatic hydrocarbon group is more preferably an alkyl group, an alkenyl group or an alkynyl group.
• Preferred forms of the alkyl group, alkenyl group and alkynyl group that can be taken as R 2 are the same as the preferred forms of the alkyl group, alkenyl group and alkynyl group that can be taken as R 1 above.
• the aliphatic hydrocarbon ring group that can be used as R 2 may be either a saturated aliphatic hydrocarbon ring group or an unsaturated aliphatic hydrocarbon ring group. Moreover, it may be a condensed ring.
• the number of carbon atoms in the aliphatic hydrocarbon ring group that can be used as R 2 is preferably 3-20, more preferably 4-18, even more preferably 5-15, still more preferably 6-12, and even more preferably 6-10.
• a saturated aliphatic hydrocarbon ring group that can be used as R 2 is preferably a cycloalkyl group.
• the unsaturated aliphatic hydrocarbon ring group that can be used as R 2 is preferably a cycloalkenyl group or a cycloalkynyl group.
• the number of ring-constituting carbon atoms of the cycloalkyl group, cycloalkenyl group and cycloalkynyl group that can be used as R 2 is preferably 4-10, more preferably 5-8.
• the aryl group that can be used as R 2 preferably has 6 to 40 carbon atoms, more preferably 6 to 30 carbon atoms, still more preferably 6 to 20 carbon atoms, still more preferably 6 to 15 carbon atoms, and even more preferably 6 to 12 carbon atoms.
• the aryl group that can be taken as R 2 is more preferably phenyl or naphthyl, with phenyl being particularly preferred.
• the heterocyclic group that can be used as R 2 preferably has 3 to 20 ring atoms, more preferably 4 to 15 atoms, and more preferably 5 to 10 atoms.
• This heterocycle may be aliphatic or aromatic. It may also have a condensed ring structure.
• the number of ring-constituting atoms is preferably 5 or 6.
• Ring-constituting heteroatoms (atoms other than carbon atoms) of the heterocyclic ring include, for example, boron (B), nitrogen (N), oxygen (O), sulfur (S), selenium (Se) and tellurium (Te). , nitrogen, oxygen and sulfur.
• heterocyclic ring constituting the heterocyclic group that can be used as R 2 include saturated heterocyclic rings such as pyrrolidine ring, imidazolidine ring, pyrazolidine ring, piperidine ring, piperazine ring, morpholine ring, 2-bora-1,3 -dioxolane ring, and 1,3-thiazolidine ring.
• unsaturated heterocyclic rings examples include pyrrole ring, imidazole ring, thiophene ring, pyrazole ring, oxazole ring, isoxazole ring, thiazole ring, triazole ring, tetrazole ring, furan ring, benzothiazole ring, benzoxazole ring, and benzotriazole.
• Preferred specific examples of the compound represented by formula (1) include acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, phenyl acrylate, phenyl methacrylate, butyl acrylate, Butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, vinyl acrylate, vinyl methacrylate, allyl acrylate, allyl methacrylate, isopropyl acrylate, isopropyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, acrylic acid dodecyl, dodecyl methacrylate, hexyl acrylate, hexyl methacrylate, stearyl acrylate, stearyl methacrylate, ethyl 2-(chloromethyl)acrylate, methyl 2-(chloromethyl)acrylate, 2-
• ring Ar represents an aromatic ring.
• the aromatic hydrocarbon ring preferably has 6 to 40 carbon atoms, more preferably 6 to 30 carbon atoms, still more preferably 6 to 20 carbon atoms, and 6 to 15 carbon atoms. is more preferred, and 6 to 12 are even more preferred.
• the aromatic hydrocarbon ring that can be used as the ring Ar may be a monocyclic ring or a condensed ring.
• Preferred specific examples of the aromatic hydrocarbon ring include a benzene ring and a naphthalene ring, with a benzene ring being particularly preferred.
• this aromatic heterocyclic ring may be a single ring or a condensed ring.
• the number of ring-constituting atoms of the aromatic heterocyclic ring is preferably 5-20, more preferably 5-15, even more preferably 5-10.
• the number of ring-constituting atoms is preferably 5 or 6.
• the ring-constituting heteroatoms (atoms other than carbon atoms) of the aromatic heterocyclic ring include, for example, nitrogen (N), oxygen (O), sulfur (S) and selenium (Se), and selected from nitrogen, oxygen and sulfur.
• aromatic heterocycles that can be used as ring Ar include pyrrole ring, imidazole ring, thiophene ring, pyrazole ring, oxazole ring, isoxazole ring, thiazole ring, triazole ring, tetrazole ring, furan ring, benzothiazole ring, benzo oxazole ring, benzotriazole ring, benzoselenazole ring, benzofuran ring, benzothiophene ring, pyridine ring, pyrazine ring, pyrimidine ring, pyridazine ring, triazine ring, quinoline ring, isoquinoline ring, quinoxaline ring and the like.
• R3 represents an electron-withdrawing group.
• An electron-withdrawing group generally refers to a substituent having a positive Hammett's ⁇ value.
• Hammett's rule was proposed by L. et al. P. A rule of thumb put forward by Hammett, which is widely accepted today. Substituent constants according to Hammett's rule can be found in general textbooks, eg, J. Am. A. Dean, ed., "Lange's Handbook of Chemistry", 12th edition, 1979 (Mc Graw-Hill) and "Kagaku no Ryori" extra edition, No. 122, pp. 96-103, 1979 (Nankodo). can.
• Examples of electron-withdrawing groups that can be used as R 3 include acyl groups (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, still more preferably 2 to 5 carbon atoms), alkoxycarbonyl groups (preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, more preferably 2 to 5 carbon atoms), an aryloxycarbonyl group (preferably 7 to 20 carbon atoms, more preferably 7 to 10 carbon atoms), carbamoyl groups, alkylsulfonyl groups (preferably 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, more preferably 2 to 5 carbon atoms), arylsulfonyl groups (preferably 6 to 20 carbon atoms, more preferably carbon atoms 6 to 10), sulfamoyl group, trifluoromethyl group, cyano group, nitro group, halogen atom (eg fluorine atom, chlorine atom) and the like.
• a group selected from an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulfonyl group, an arylsulfonyl group, a sulfamoyl group, a cyano group, a nitro group and a halogen atom more preferably an acyl group, A group selected from an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a sulfamoyl group, a cyano group and a halogen atom, more preferably a group selected from an acyl group, a sulfamoyl group and a halogen atom.
• n representing the number of R3 is an integer of 1 or more. That is, in the compound represented by general formula (2), ring Ar has one or more electron-withdrawing groups as substituents. When the ring Ar has two or more electron-withdrawing groups R3 , the two or more electron-withdrawing groups R3 may be the same or different.
• R4 represents a chain aliphatic group, an aliphatic hydrocarbon ring group, an aryl group or a heterocyclic group.
• the chain aliphatic group, aliphatic hydrocarbon ring group, aryl group and heterocyclic group that can be taken as R 4 are respectively the chain aliphatic group, aliphatic hydrocarbon ring group, aryl group and It has the same meaning as heterocyclic group, and the preferred form is also the same.
• R 4 is never an ⁇ -hydroxybenzyl group. When R 4 is an ⁇ -hydroxybenzyl group, side reactions are particularly likely to proceed, giving many by-products. From the same point of view, it is more preferable that R4 does not have a hydroxy group.
• the compound represented by general formula (2) is preferably a compound that does not have a hydroxy group as a substituent.
• n representing the number of R4 is an integer of 0 or more.
• the two or more R4 's may be the same or different.
• the maximum value (upper limit) of the total number of m and n (m+n) is the maximum number of substituents that the ring-constituting atoms of ring Ar can have.
• the maximum value is 5.
• m is an integer of 1 to 3 (preferably 1 or 2, more preferably 1)
• n is an integer of 0 to 4 (preferably an integer of 0 to 3, more preferably 0 to It is preferably an integer of 2, more preferably 0 or 1).
• the ring Ar is preferably a 5- or 6-membered ring, more preferably a benzene ring.
• Preferred specific examples of the compound represented by formula (2) include sulfanilamide, 4-fluoroaniline, 4-aminoacetophenone, 2,4-difluoroaniline, 4-chloroaniline, 2-methyl-4-fluoroaniline, 4-bromoaniline, 2,4-dibromoaniline, 2,4-dichloroaniline, 2,4,6-trifluoroaniline, 2-fluoroaniline, pentafluoroaniline, 3-chloro-4-fluoroaniline, 4-trifluoroaniline fluoromethylaniline, 4-nitroaniline, 2-fluoro-5-methylaniline, 4-aminobenzophenone, 2'-aminoacetophenone, 4'-amino-3',5'-dichloroacetophenone, 2-trifluoromethylaniline, 2-iodo-4-(trifluoromethyl)aniline, 4-amino-3-chlorobenzotrifluoride, 4-amino-3-bromobenzotri
• R 1 , Ar, R 3 , R 4 , m and n are R 1 , Ar, R 3 , R 4 and m described in general formulas (1) to (2), respectively. and n, and the preferred forms are also the same.
• Halogen atom eg, fluorine atom, chlorine atom, bromine atom, iodine atom
• alkyl group [linear, branched, cyclic substituted or unsubstituted alkyl group.
• alkyl groups preferably alkyl groups having 1 to 30 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, t-butyl, n-octyl, eicosyl, 2-chloroethyl, 2-cyanoethyl, 2-ethylhexyl
• a cycloalkyl group preferably a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, such as cyclohexyl, cyclopentyl, 4-n-dodecylcyclohexyl
• a bicycloalkyl group preferably having 5 to 30 carbon atoms
• a substituted or unsubstituted bicycloalkyl group that is, a monovalent group obtained by removing one hydrogen atom from a bicycloalkane having 5 to 30 carbon atoms, such as bicyclo[1,2,2]heptan-2-yl
• Alkenyl Group represents a linear, branched, or cyclic substituted or unsubstituted alkenyl group. They are alkenyl groups (preferably substituted or unsubstituted alkenyl groups having 2 to 30 carbon atoms, such as vinyl, allyl, prenyl, geranyl, oleyl), cycloalkenyl groups (preferably substituted or an unsubstituted cycloalkenyl group, that is, a monovalent group obtained by removing one hydrogen atom from a cycloalkene having 3 to 30 carbon atoms (eg, 2-cyclopenten-1-yl, 2-cyclohexen-1-yl), Bicycloalkenyl group (substituted or unsubstituted bicycloalkenyl group, preferably a substituted or unsubstituted bicycloalkenyl group having 5 to 30 carbon atoms, that is, a monovalent bicycloalkene having one double bond with
• an alkynyl group (preferably a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, such as ethynyl, propargyl, trimethylsilylethynyl group),
• aryl group preferably substituted or unsubstituted aryl group having 6 to 30 carbon atoms, such as phenyl, p-tolyl, naphthyl, m-chlorophenyl, o-hexadecanoylaminophenyl
• heterocyclic group preferably 5 or 6 A monovalent group obtained by removing one hydrogen atom from a substituted or unsubstituted aromatic or non-aromatic heterocyclic compound, more preferably a 5- or 6-membered aromatic having 3 to 30 carbon atoms
• 2-furyl, 2-thienyl, 2-pyrimidinyl, 2-benzothiazolyl cyano group, nitro group, carboxyl group, alkoxy group (preferably substituted or unsubstituted group having 1 to 30 carbon atoms).
• substituted alkoxy groups such as methoxy, ethoxy, isopropoxy, t-butoxy, n-octyloxy, 2-methoxyethoxy
• aryloxy groups preferably substituted or unsubstituted aryloxy groups having 6 to 30 carbon atoms, for example, phenoxy, 2-methylphenoxy, 4-t-butylphenoxy, 3-nitrophenoxy, 2-tetradecanoylaminophenoxy
• a silyloxy group (preferably a silyloxy group having 3 to 20 carbon atoms, such as trimethylsilyloxy, t-butyldimethylsilyloxy), a heterocyclic oxy group (preferably a substituted or unsubstituted heterocyclic oxy group having 2 to 30 carbon atoms) group, 1-phenyltetrazol-5-oxy, 2-tetrahydropyranyloxy), acyloxy group (preferably formyloxy group, substituted or unsubstituted alkylcarbonyloxy group having 2 to 30 carbon atoms, substituted or unsubstituted arylcarbonyloxy groups such as formyloxy, acetyloxy, pivaloyloxy, stearoyloxy, benzoyloxy, p-methoxyphenylcarbonyloxy), carbamoyloxy groups (preferably substituted or unsubstituted groups having 1 to 30 carbon atoms); substituted carbamoyloxy groups such as N,N
• Aryl or heterocyclic azo group (preferably substituted or unsubstituted aryl azo group having 6 to 30 carbon atoms, substituted or unsubstituted heterocyclic azo group having 3 to 30 carbon atoms, such as phenylazo, p-chlorophenylazo, 5- ethylthio-1,3,4-thiadiazol-2-ylazo), an imide group (preferably N-succinimide, N-phthalimide), a phosphino group (preferably a substituted or unsubstituted phosphino group having 2 to 30 carbon atoms, dimethylphosphino, diphenylphosphino, methylphenoxyphosphino), a phosphinyl group (preferably a substituted or unsubstituted phosphinyl group having 2 to 30 carbon atoms, such as phosphinyl, dioctyloxyphosphinyl, diethoxyphosphinyl ), phos
• those having a hydrogen atom may be removed and further substituted with a group selected from the above substituent group Z.
• the production method of the present invention is characterized in that the compound represented by the general formula (1) and the compound represented by the general formula (2) are reacted at a temperature exceeding 120° C. to effect amidation.
• the formation of the 1,4-adduct as a by-product can be effectively suppressed, and the desired 1,2-adduct can be obtained.
• a compound having no electron-withdrawing group R3 in the general formula (2) is used as the raw material amine compound, the problem of regioselectivity of the reaction does not appear. In other words, the desired 1,2-adduct can be obtained efficiently to some extent without deliberately controlling the temperature.
• the compound represented by the general formula (2) which is the raw material amine compound, has an electron-withdrawing group in the ring Ar, and the by-product 1,4-adduct is It turned out to be easy to produce.
• a sulfanilamide having a sulfamoyl group as the electron-withdrawing group R3 is used as the compound represented by the general formula (2), even when the reaction is carried out at a high temperature of about 100°C, comparative examples described later As shown, it has been found that the amount of 1,4-adduct produced is about 10 times or more in terms of molar ratio relative to the amount of the desired 1,2-adduct produced.
• the reaction temperature is controlled in a high temperature range exceeding 120°C.
• the reaction temperature By controlling the reaction temperature, it is possible to dramatically increase the production efficiency of the desired 1,2-adduct without using an expensive starting material activator and without using a reagent such as a condensing agent. Become. The reason for this is not clear, but I believe it is as follows.
• the compound represented by the general formula (1) and the compound represented by the general formula (2) are reacted, it is considered that the following two reactions mainly occur.
• the scheme below shows a case where methacrylic acid is applied as the compound represented by the general formula (1), and sulfanilamide is applied as the compound represented by the general formula (2).
• the 1,4-addition reaction is reversible, and the reverse reaction of the 1,4-addition reaction (retro-Michael reaction) is promoted by carrying out the reaction in a specific high-temperature region, producing a 1,2-adduct.
• the temperature range in which this retro-Michael reaction occurs has not been known until now, and in a situation where it is known that side reactions are likely to occur if the reaction is performed at a high temperature, the present invention defines At the time of filing of the present application, it was completely unknown how the high-temperature reaction affects the amidation reaction.
• the target 1,2-adduct can be obtained without any special device and while using inexpensive raw materials. It is possible to significantly improve the generation efficiency.
• the reaction (amidation reaction) between the compound represented by the general formula (1) and the compound represented by the following general formula (2) should be controlled at a temperature exceeding 120°C. It may be a batch reaction, or a raw material mixture (meaning a reaction solution before the start of the reaction) in the flow path, and if a solvent, catalyst, additive, etc. are used in addition to the raw material, it is a mixed solution containing these. ) may be applied in a flow-type (flow-type) reaction.
• the flow reaction itself is known, for example, WO 2020/066561, WO 2019/188749, WO 2018/180456, JP 2016-160124, etc. can be referred to as appropriate. can be done.
• the method of controlling the reaction temperature to over 120° C. is not particularly limited, either, and for example, it can be controlled using a constant temperature bath. It is also preferable to control the temperature by heating the raw material mixture by microwave irradiation. By applying microwave heating, the raw material mixture can be instantly heated to a desired high temperature in a non-contact manner, and the reaction conditions for the amidation reaction can be precisely controlled. In the production method of the present invention, it is also preferable that the amidation reaction is carried out by a flow reaction, and the temperature of the flow reaction is controlled by microwave irradiation.
• the reaction temperature of the amidation reaction is preferably 121° C. or higher, more preferably 122° C. or higher, even more preferably 123° C.
• the reaction temperature is preferably 130° C. or higher, preferably 140° C. or higher, preferably 150° C. or higher, preferably 160° C. or higher, and preferably 180° C. or higher. , preferably 200° C. or higher, preferably 205° C. or higher, preferably 210° C. or higher, and preferably 220° C. or higher. A higher temperature tends to promote the retro-Michael reaction.
• the reaction temperature of the amidation reaction is usually 500° C. or lower, preferably 400° C. or lower, more preferably 350° C. or lower, and 300° C. or lower, from the viewpoint of preventing an excessive pressure rise in the reaction system. C. or less, and preferably 280.degree. C. or less.
• the raw material mixture when the amidation reaction is performed batchwise, is generally sufficiently stirred and then heat-treated. It is also preferable to apply the heat treatment while stirring the raw material mixture.
• the amidation reaction is carried out in a flow-type reaction, the raw material mixed solution is heated while being circulated in the flow path to cause the amidation reaction.
• the flow-type reaction has the advantage of being able to continuously obtain reaction products while continuously supplying raw materials.
• the raw material mixture can be mixed in a vessel, introduced into the channel, and heated while flowing downstream to cause an amidation reaction.
• the liquid containing the compound represented by the general formula (1) and the liquid containing the compound represented by the general formula (2) are circulated in different flow paths, and these flow paths are merged. It is also possible to heat the combined liquid while it is flowing downstream to cause an amidation reaction.
• the amount of the compound represented by the general formula (1) and the compound represented by the general formula (2) to be used is represented by the desired 1,2-adduct represented by the general formula (3). It is not particularly limited as long as a compound can be obtained.
• the amount of the compound represented by the general formula (2) used is large, the amount of the 1,4-adduct, which is a by-product, tends to increase, so it is usually represented by the general formula (1)
• the compound is reacted in molar excess over the compound represented by general formula (2).
• a solvent for the amidation reaction it is possible to reduce the viscosity of the raw material mixed liquid, and it is thought that side reactions can be suppressed more effectively along with the improvement of mixing efficiency and the like.
• the solvent an organic solvent capable of dissolving the reaction raw materials is usually used. From the viewpoint of suppressing pressure rise, the solvent preferably has a boiling point of 100° C. or higher, more preferably 150° C. or higher. This boiling point is the boiling point at 0.1 MPa. If an alcohol-based solvent, an ester-based solvent, or an acyclic amide-based solvent having no urea bond is used as the solvent, the progress of the amidation reaction may be hindered.
• solvents other than these solvents.
• preferred solvents include nitrile solvents (solvents composed of compounds having a nitrile group), ether solvents (solvents composed of compounds having an ether bond), and aliphatic hydrocarbon solvents (solvents composed of aliphatic hydrocarbon compounds).
• aromatic hydrocarbon solvents (solvents composed of aromatic hydrocarbon compounds), carbonate solvents (solvents composed of carbonate ester compounds), ketone solvents (solvents composed of ketone compounds), sulfoxide solvents (solvents composed of sulfoxide compounds solvents), sulfone-based solvents (solvents composed of sulfone compounds), cyclic amide-based solvents (solvents composed of cyclic amide compounds), and urea-based solvents (solvents composed of compounds having a urea bond).
• nitrile solvents include acetonitrile, propionitrile and the like.
• ether solvents include diethyl ether, dibutyl ether, diisopropyl ether, t-butyl methyl ether, cyclopentyl methyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 4-methyltetrahydropyran, 1,4-dioxane and the like.
• aliphatic hydrocarbon solvents include hexane, heptane, octane, decane and the like.
• aromatic hydrocarbon solvents include benzene, toluene, xylene, dichlorobenzene, benzotrifluoride, nitrobenzene and the like.
• carbonate solvents include ethylene carbonate and propylene carbonate.
• sulfoxide solvents include dimethylsulfoxide and the like.
• sulfone solvents include 3-methylsulfolane and sulfolane.
• cyclic amide solvents include N-methyl-2-pyrrolidone.
• urea solvents include 1,3-dimethyl-2-imidazolidinone, N,N'-dimethylpropyleneurea, N,N,N',N'-tetramethylurea and the like.
• the amount of solvent used can be appropriately set in consideration of the viscosity of the raw material mixture, the concentration of the reaction product, and the like.
• the amount of the solvent used can be 1 to 100 parts by mass. It is also preferable to use up to 60 parts by mass, and it is also preferable to use 10 to 30 parts by mass.
• a catalyst for the amidation reaction it becomes possible to further increase the regioselectivity of the reaction.
• at least one of Lewis acids, Bronsted acids, metal oxides and phosphorus oxide compounds is used as the reaction catalyst.
• a Lewis acid is a substance that can accept a pair of electrons.
• Examples of Lewis acid catalysts that can be used in the amidation reaction include BF 3 OEt 2 , AlBr 3 , AlCl 3 , ZnI 2 , MgCl 2 , TiCl 4 , TiCl 3 (OiPr), TiCl 2 (OiPr) 2 , TiCl ( OiPr) 3 , Ti(OiPr) 4 , SnCl4 , SnCl3, EtAlCl2 , FeCl3 , ZnCl2, TMSOTf, FeBr3 , BBr3 , Sc(OTf) 2 , Zn(OTf) 2 , La(OTf) 3 , Yb(OTf) 3 , Hf(OTf) 4 , BeCl 2 , CdCl 2 , GaCl 3 , SbCl 5 and the like.
• titanium compounds are preferred, and TiCl4 is more preferred.
• Et is ethyl
• iPr is isopropyl
• Tf is trifluoromethylsulfonyl
• TMS is trimethylsilyl.
• a Lewis acid when used as the reaction catalyst, one or more of the above Lewis acids can be used.
• a Bronsted acid is an acid that has a proton and can release or dissociate this proton.
• Bronsted acid catalysts include hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, boric acid, formic acid, acetic acid, trichloroacetic acid, trifluoroacetic acid, methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, - camphorsulfonic acid, Amberlyst® 15 hydrogen form.
• sulfonic acid compounds are preferred.
• a Bronsted acid when used as the reaction catalyst, one or more of the above Bronsted acids can be used.
• the metal oxide is not particularly limited as long as it is a metal oxide.
• Mixtures containing metal oxides such as zeolites and clay minerals can also be used. Among them, TiO2 is preferable.
• a metal oxide when a metal oxide is used as the reaction catalyst, one or more of the above metal oxides can be used.
• a phosphorus oxide compound is a compound having an oxygen atom directly bonded to a phosphorus atom.
• the phosphorus oxide compound is an acid capable of releasing or dissociating protons, such as phosphoric acid or polyphosphoric acid
• the phosphorus oxide compound is Bronsted acid.
• a compound that is both a Bronsted acid and a phosphorus oxide compound is positioned as a phosphorus oxide compound instead of the above Bronsted acid for the sake of convenience.
• Specific examples of phosphorus oxide compounds include diphosphorus pentoxide, hypophosphorous acid, phosphorous acid, and phosphoric acid.
• Polymerized phosphoric acid such as pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid, and tetrametaphosphoric acid is also preferred as the phosphorus oxide compound.
• diphosphorus pentoxide is preferable because it has an effect of suppressing elimination of the electron-withdrawing group in a high-temperature reaction. It is presumed that one of the reasons for this is that diphosphorus pentoxide traps moisture that is the starting point of the above elimination reaction. Eaton's reagent can also be used as diphosphorus pentoxide.
• a phosphorus oxide compound when a phosphorus oxide compound is used as the reaction catalyst, one or more of the above phosphorus oxide compounds can be used.
• the reaction time of the amidation reaction (the time of exposure to a temperature exceeding 120°C) is not particularly limited, and is appropriately adjusted within a range in which a sufficient amount of the desired reaction product can be obtained.
• the reaction time can be 1 to 300 minutes, preferably 2 to 240 minutes, preferably 3 to 120 minutes, and more preferably 4 to 90 minutes. Precise temperature control such as microwave heating makes it possible to shorten the reaction time.
• the reaction can be terminated, for example, by cooling.
• a polymerization inhibitor in order to prevent the unsaturated double bond of the compound represented by general formula (1) from causing an addition polymerization reaction.
• Common polymerization inhibitors can be used, for example, TEMPO, 4-hydroxy TEMPO, etc. can be used as appropriate.
• the target compound represented by the general formula (3) can be produced in the reaction solution as a main reaction product by the amidation reaction.
• the amount of the compound represented by the general formula (3) (1,2-adduct) and the by-product 1,4-adduct in the reaction solution after the amidation reaction (in the unpurified reaction solution) The ratio is the molar ratio, 0.3 ⁇ [1,2-adduct]/[1,4-adduct] and preferably 0.5 ⁇ [1,2-adduct]/[1,4-adduct] It is more preferable to have 0.8 ⁇ [1,2-adduct]/[1,4-adduct] It is more preferable to have 1.1 ⁇ [1,2-adduct]/[1,4-adduct] It is more preferable to have 1.2 ⁇ [1,2-adduct]/[1,4-adduct] It is more preferable to have 1.4 ⁇ [1,2-adduct]/[1,4-adduct] It is more preferable to have 1.7 ⁇ [1,
• the compound represented by the general formula (3) which is the target 1,2-adduct, can also be separated and purified from the reaction solution after the amidation reaction is completed.
• a general technique can be appropriately applied. For example, flash column chromatography, thin layer column chromatography, crystallization, recrystallization, distillation, etc. can be applied alone or in combination.
• Example 1 10 mg of 4-hydroxy TEMPO, 1.0 g (5.8 mmol, 1.0 eq.) of sulfanilamide, and 1.25 g (14.5 mmol, 2.5 eq.) of methacrylic acid were placed in a 2 mL vial for microwave reaction. The reaction mixture was taken and the vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. No solvent was used in this reaction system. ⁇ Reaction conditions> Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 2 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.62 g (7.3 mmol, 2.5 eq.) of methacrylic acid, solvent 0.62 mL of sulfolane was added and mixed to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 20 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 3 A 2 mL vial for microwave reaction was charged with 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, and 1.25 g (14.5 mmol, 5.0 eq.) of methacrylic acid. Then, 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to form a reaction mixture, and the vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 4 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.62 g (7.3 mmol, 2.5 eq.) of methacrylic acid, solvent 0.62 mL of sulfolane was added as a solution and mixed, then 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 5 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 1.2 g (15 mmol, 5.0 eq.) of methacrylic acid, and 1 , 3-dimethyl-2-imidazolidinone (DMI) 0.25 mL was added and mixed, then 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to form a reaction mixture, and a vial was added. was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 10 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 6 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.62 g (7.3 mmol, 2.5 eq.) of methacrylic acid, solvent 0.62 mL of butyl acetate was added as a solution and mixed, then 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 150°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 7 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (3.7 mmol, 1.0 eq.) of 4'-aminoacetophenone, 1.6 g (18 mmol, 5.0 eq.) of methacrylic acid, 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) was added as a solvent and mixed, then 70 mg (0.37 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to give a reaction mixture. and the vial was sealed.
• DMI 1,3-dimethyl-2-imidazolidinone
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 150°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 8 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (4.0 mmol, 1.0 eq.) of 4-fluoro-2-methylaniline, and 1.7 g (20 mmol, 5.0 eq.) of methacrylic acid. ), 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) as a solvent was added and mixed, and then 76 mg (0.40 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst. The reaction mixture was taken and the vial was sealed.
• DMI 1,3-dimethyl-2-imidazolidinone
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 150°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 9 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 1.5 g (15 mmol, 5.0 eq.) of methyl methacrylate, as solvent Add 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) and mix, then add 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride as a Lewis acid catalyst to obtain a reaction mixture, The vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 10 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 2.4 g (15 mmol, 5.0 eq.) of phenyl methacrylate, as solvent Add 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) and mix, then add 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride as a Lewis acid catalyst to obtain a reaction mixture, The vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 11 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (3.7 mmol, 1.0 eq.) of 4'-aminoacetophenone, 1.6 g (18 mmol, 5.0 eq.) of methacrylic acid, 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) was added as a solvent and mixed, then 70 mg (0.37 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to give a reaction mixture. and the vial was sealed.
• DMI 1,3-dimethyl-2-imidazolidinone
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 12 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (3.9 mmol, 1.0 eq.) of 4-chloroaniline, 1.7 g (20 mmol, 5.0 eq.) of methacrylic acid, solvent As a reaction mixture, 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) was added and mixed, and then 74 mg (0.39 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst. , the vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 13 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (4.0 mmol, 1.0 eq.) of 4-fluoro-2-methylaniline, and 1.7 g (20 mmol, 5.0 eq.) of methacrylic acid. ), 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) as a solvent was added and mixed, and then 76 mg (0.40 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst. The reaction mixture was taken and the vial was sealed.
• DMI 1,3-dimethyl-2-imidazolidinone
• the vial was opened after the internal pressure was released with the injection needle.
• the target 1,2-adduct was not observed, and only the by-product 1,4-adduct was observed.
• the vial was opened after the internal pressure was released with the injection needle.
• the target 1,2-adduct was not observed, and only the by-product 1,4-adduct was observed.
• the vial was opened after the internal pressure was released with the injection needle.
• the target 1,2-adduct was not observed, and only the by-product 1,4-adduct was observed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 115°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 115°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• reaction solution was analyzed by NMR, but the amount of by-products was very large, and the ratio of 1,2-adduct and 1,4-adduct could not be obtained.
• Example 14 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.62 g (7.3 mmol, 2.5 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added and mixed, and then 42 mg (0.29 mmol, 0.1 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to form a reaction mixture, and the vial was sealed. .
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 200°C Pre-stirring: 0.5 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 15 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.62 g (7.3 mmol, 2.5 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added and mixed, and then 0.21 g (1.45 mmol, 0.5 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 200°C Pre-stirring: 0.5 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 16 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.62 g (7.3 mmol, 2.5 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added and mixed, and then 0.17 g (1.2 mmol, 0.4 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 200°C Pre-stirring: 0.5 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 17 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.26 g (3.0 mmol, 1.05 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added and mixed, and then 0.17 g (1.2 mmol, 0.4 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 200°C Pre-stirring: 0.5 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 18 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.26 g (3.0 mmol, 1.05 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added and mixed, and then 0.17 g (1.2 mmol, 0.4 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 225°C Pre-stirring: 0.5 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 19 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.26 g (3.0 mmol, 1.05 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added and mixed, and then 0.17 g (1.2 mmol, 0.4 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 150°C Pre-stirring: 0.5 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 20 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 0.26 g (3.0 mmol, 1.05 eq.) of methacrylic acid, solvent 0.25 mL of N-methylpyrrolidone (NMP) was added as a catalyst and mixed, and then 0.17 g (1.2 mmol, 0.4 eq.) of diphosphorus pentoxide was added as a phosphorus oxide compound catalyst to prepare a reaction mixture. After sealing the vial, it was heated and stirred in an oil bath at 225° C. for 10 minutes.
• NMP N-methylpyrrolidone
• Example 21 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 1.2 g (15 mmol, 5.0 eq.) of methacrylic acid, and 1 , 3-dimethyl-2-imidazolidinone (DMI) 0.25 mL was added and mixed, then 28 mg (0.3 mmol, 0.1 eq.) of methanesulfonic acid was added as a Bronsted acid catalyst to obtain a reaction mixture, The vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 22 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 1.2 g (15 mmol, 5.0 eq.) of methacrylic acid, xylene as solvent was added and mixed, then 28 mg (0.3 mmol, 0.1 eq.) of methanesulfonic acid was added as a Bronsted acid catalyst to form a reaction mixture, and the vial was sealed.
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 250°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 23 10 mg of 4-hydroxy TEMPO, 1.0 g (5.8 mmol, 1.0 eq.) of sulfanilamide, and 1.25 g (14.5 mmol, 2.5 eq.) of methacrylic acid were placed in a 2 mL vial for microwave reaction. The reaction mixture was taken and the vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. No solvent was used in this reaction system. ⁇ Reaction conditions> Set temperature: 125°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 24 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 1.5 g (15 mmol, 5.0 eq.) of methyl methacrylate, as solvent Add 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) and mix, then add 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride as a Lewis acid catalyst to obtain a reaction mixture, The vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 125°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 25 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (2.9 mmol, 1.0 eq.) of sulfanilamide, 2.4 g (15 mmol, 5.0 eq.) of phenyl methacrylate, as solvent Add 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) and mix, then add 55 mg (0.29 mmol, 0.1 eq.) of titanium tetrachloride as a Lewis acid catalyst to obtain a reaction mixture, The vial was sealed. The vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 125°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 26 In a 2 mL vial for microwave reaction, 5 mg of 4-hydroxy TEMPO, 0.5 g (3.7 mmol, 1.0 eq.) of 4'-aminoacetophenone, 1.6 g (18 mmol, 5.0 eq.) of methacrylic acid, 0.25 mL of 1,3-dimethyl-2-imidazolidinone (DMI) was added as a solvent and mixed, then 70 mg (0.37 mmol, 0.1 eq.) of titanium tetrachloride was added as a Lewis acid catalyst to give a reaction mixture. and the vial was sealed.
• DMI 1,3-dimethyl-2-imidazolidinone
• the vial was set in a microwave reactor manufactured by BIOTAGE, and the amidation reaction was carried out under the reaction conditions set as follows. Set temperature: 125°C Pre-stirring: 2 minutes Reaction time: 5 minutes Stirring speed: 900 rpm Absorption level: very high
• Example 27 In a 300 mL three-neck flask, 50.0 mg of 4-hydroxy TEMPO, 10.00 g (58.07 mmol, 1.0 eq.) of sulfanilamide, 8.75 g (101.63 mmol, 1.75 eq.) of methacrylic acid, as a solvent 20 mL of N-methylpyrrolidone (NMP) was added and mixed at 80°C. After the inside of the test tube was replaced with nitrogen, 5.95 g (40.65 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 28 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.24 mmol, 1.0 eq.) of 4-nitroaniline, 1.09 g (12.67 mmol, 1.75 eq.) of methacrylic acid, 2.0 mL of N-methylpyrrolidone (NMP) was added as a solvent and mixed. After the inside of the test tube was replaced with nitrogen, 0.74 g (5.1 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 29 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.75 mmol, 1.0 eq.) of 2,4-difluoroaniline, and 1.16 g (13.55 mmol, 1.75 eq.) of methacrylic acid were added. ), and 2.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.79 g (5.42 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 30 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (9.00 mmol, 1.0 eq.) of 2-fluoroaniline, 1.36 g (15.75 mmol, 1.75 eq.) of methacrylic acid, 2.0 mL of N-methylpyrrolidone (NMP) was added as a solvent and mixed. After the inside of the test tube was replaced with nitrogen, 0.92 g (6.30 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 31 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.99 mmol, 1.0 eq.) of 4-fluoro-2-methylaniline, and 1.20 g (13.98 mmol, 1.0 eq.) of methacrylic acid were added. 75 eq.), and 2.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.82 g (5.59 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 32 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.21 mmol, 1.0 eq.) of 4-(trifluoromethyl)aniline, and 0.94 g (10.86 mmol, 1.0 eq.) of methacrylic acid were added. 75 eq.), and 2.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.64 g (4.34 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 33 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.84 mmol, 1.0 eq.) of 4-chloroaniline, 1.18 g (13.72 mmol, 1.75 eq.) of methacrylic acid, 2.0 mL of N-methylpyrrolidone (NMP) was added as a solvent and mixed. After the inside of the test tube was replaced with nitrogen, 0.80 g (5.49 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 34 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.40 mmol, 1.0 eq.) of 4-acetylaniline, 1.11 g (12.95 mmol, 1.75 eq.) of methacrylic acid, 2.0 mL of N-methylpyrrolidone (NMP) was added as a solvent and mixed. After the inside of the test tube was replaced with nitrogen, 0.76 g (5.18 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 4 hours.
• NMP N-methylpyrrolidone
• Example 35 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (4.78 mmol, 1.0 eq.) of 3,5-dimethoxycarbonylaniline, and 0.72 g (8.37 mmol, 1.75 eq.) of methacrylic acid .) and 2.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.49 g (3.35 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• NMP N-methylpyrrolidone
• Example 36 In a 30 mL test tube, 10 mg of 4-hydroxy TEMPO, 1.0 g (3.12 mmol, 1.0 eq.) of 2,2-bis(trifluoromethyl)benzidine, 0.94 g (10.93 mmol, 3 .50 eq.) and 4.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.64 g (4.37 mmol, 1.40 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• NMP N-methylpyrrolidone
• the area % of the target 1,2-adduct was 66.08%, and the by-product 1,4-adduct was not observed.
• Example 37 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.21 mmol, 1.0 eq.) of 4-(trifluoromethyl)aniline, and 0.94 g (10.86 mmol, 1.0 eq.) of methacrylic acid were added. 75 eq.) and 2.0 mL of diethylene glycol dimethyl ether as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.64 g (4.34 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• Example 38 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.62 mmol, 1.0 eq.) of methyl 4-aminobenzoate, and 1.00 g (11.58 mmol, 1.75 eq.) of methacrylic acid were added. ), and 2.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.68 g (4.63 mmol, 0.70 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• NMP N-methylpyrrolidone
• Example 39 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.62 mmol, 1.0 eq.) of methyl 4-aminobenzoate, and 1.00 g (11.58 mmol, 1.75 eq.) of methacrylic acid were added. ) and 2.0 mL of diethylene glycol dimethyl ether as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.68 g (4.63 mmol, 0.70 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• Example 40 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.62 mmol, 1.0 eq.) of methyl 4-aminobenzoate, and 1.00 g (11.58 mmol, 1.75 eq.) of methacrylic acid were added. ) and 2.0 mL of sulfolane as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.68 g (4.63 mmol, 0.70 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• Example 41 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.62 mmol, 1.0 eq.) of methyl 4-aminobenzoate, and 1.00 g (11.58 mmol, 1.75 eq.) of methacrylic acid were added. ) and 2.0 mL of propylene carbonate as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.68 g (4.63 mmol, 0.70 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• Example 42 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.62 mmol, 1.0 eq.) of methyl 4-aminobenzoate, and 1.00 g (11.58 mmol, 1.75 eq.) of methacrylic acid were added. ), and 2.0 mL of 1,3-dimethyl-2-imidazolinone (DMI) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.68 g (4.63 mmol, 0.70 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• DMI 1,3-dimethyl-2-imidazolinone
• Example 43 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (6.21 mmol, 1.0 eq.) of 4-(trifluoromethyl)aniline, and 0.94 g (10.86 mmol, 1.0 eq.) of methacrylic acid were added. 75 eq.), and 2.0 mL of 1,3-dimethyl-2-imidazolinone (DMI) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.64 g (4.34 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• DMI 1,3-dimethyl-2-imidazolinone
• Example 44 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.75 mmol, 1.0 eq.) of 2,4-difluoroaniline, and 0.98 g (13.55 mmol, 1.75 eq.) of acrylic acid were added. ), and 2.0 mL of N-methylpyrrolidone (NMP) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.79 g (5.42 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• NMP N-methylpyrrolidone
• Example 45 In a 30 mL test tube, 5.0 mg of 4-hydroxy TEMPO, 1.0 g (7.75 mmol, 1.0 eq.) of 2,4-difluoroaniline, and 0.98 g (13.55 mmol, 1.75 eq.) of acrylic acid were added. ), and 2.0 mL of 1,3-dimethyl-2-imidazolinone (DMI) as a solvent were added and mixed. After the inside of the test tube was replaced with nitrogen, 0.79 g (5.42 mmol, 0.7 eq.) of phosphorus pentoxide was added, and the mixture was heated and stirred at 125° C. for 1 hour.
• DMI 1,3-dimethyl-2-imidazolinone

Landscapes

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

Priority Applications (3)

Applications Claiming Priority (6)

Related Child Applications (1)

Publications (1)

Family

ID=84229866

Family Applications (1)

Country Status (4)

Citations (14)

Family Cites Families (5)

• 2022
  • 2022-05-20 WO PCT/JP2022/021000 patent/WO2022249994A1/ja not_active Ceased
  • 2022-05-20 CN CN202280031115.XA patent/CN117242052B/zh active Active
  • 2022-05-20 JP JP2023523451A patent/JPWO2022249994A1/ja active Pending
• 2023
  • 2023-10-17 US US18/488,978 patent/US20240051916A1/en active Pending

Patent Citations (14)

Also Published As

Similar Documents

Legal Events