Pyrazino[2,3-D]isoxazole derivative which is useful as a production intermediate of pyrazine carboxamide derivative

1. A compound represented by the following formula (I):

wherein X represents a halogen atom, a hydroxy group or a sulfamoyloxy group, wherein a nitrogen atom of the sulfamoyloxy group may be substituted with a hydroxy group, an amino group, an alkyl group, an aryl group, a heterocyclic group, or an alkylene group with or without the mediation of a heteroatom, and said substituent may further have one or more substituents which are selected from substituent group A; and Y represents —C(═O)R or —CN; wherein R represents a hydrogen atom, an alkoxy group, an aryloxy group, an alkyl group, an aryl group or an amino group;

wherein the alkoxy group, aryloxy group, alkyl group, and aryl group may be optionally substituted with one or more substituents selected from substituent group A, and the amino group may be optionally substituted with a substituent which is selected from a hydroxy group, an amino group, an alkyl group, an aryl group, a heterocyclic group or an alkylene group with or without the mediation of a heteroatom, and said substituent may further have one or more substituents which are selected from substituent group A; substituent group A: an alkyl group containing 1 to 10 carbon atoms, an alkenyl group containing 2 to 10 carbon atoms, an alkynyl group containing 2 to 10 carbon atoms, an alkoxy group containing 1 to 10 carbon atoms, an aryloxy group containing 6 to 10 carbon atoms, a halogen atom, an aryl group containing 6 to 10 carbon atoms, a hydroxy group, an amino group, an acylamino group containing 1 to 10 carbon atoms, an alkylsulfonylamino group containing 1 to 10 carbon atoms, a carbamoyl group containing 1 to 10 carbon atoms, a sulfamoyl group containing 0 to 10 carbon atoms, a carboxyl group, an alkoxycarbonyl group containing 2 to 10 carbon atoms, an acyloxy group containing 2 to 12 carbon atoms, a heterocyclic group, a cyano group, and a nitro group.

2. The compound according to claim 1 , wherein Y represents —C(═O)R where R represents an alkoxy group or an amino group, wherein the alkoxy group may be optionally substituted with one or more substituents selected from the substituent group A, and the amino group may be optionally substituted with a substituent which is selected from a hydroxy group, an amino group, an alkyl group, an aryl group, a heterocyclic group or an alkylene group with or without the mediation of a heteroatom, and said substituent may further have one or more substituents which are selected from the substituent group A.

3. The compound according to claim 2 , wherein X represents a hydroxy group, a chlorine atom or a fluorine atom.

4. The compound according to claim 1 , wherein X represents a hydroxy group, a chlorine atom or a fluorine atom.

5. The compound according to claim 1 , wherein X represents a fluorine atom or a chlorine atom, and Y represents —C(═O)R where R represents an alkoxy group which may be optionally substituted with one or more substituents selected from the substituent group A.

6. The compound according to claim 1 , wherein X represents a fluorine atom or a chlorine atom, and Y represents —C(═O)R where R represents a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, or an n-butoxy group.

7. A method for producing a compound represented by the following formula (I-1):

which comprises treating a compound represented by the following formula (II):

with an acid;

wherein, in formula (I-1) and formula (II),

Y represents —C(═O)R or —CN;

R represents a hydrogen atom, an alkoxy group, an aryloxy group, an alkyl group, an aryl group or an amino group; wherein said alkoxy group, aryloxy group, alkyl group, and aryl group may be optionally substituted with one or more substituents selected from substituent group A, and said amino group may be optionally substituted with a substituent which is selected from a hydroxy group, an amino group, an alkyl group, an aryl group, a heterocyclic group or an alkylene group with or without the mediation of a heteroatom, and said substituent may further have one or more substituents which are selected from substituent group A; and

in formula (II),

R 1 represents a hydrogen atom or an alkyl group; wherein said alkyl group may be optionally substituted with one or more substituents selected from the substituent group A,

substituent group A: an alkyl group containing 1 to 10 carbon atoms, an alkenyl group containing 2 to 10 carbon atoms, an alkynyl group containing 2 to 10 carbon atoms, an alkoxy group containing 1 to 10 carbon atoms, an aryloxy group containing 6 to 10 carbon atoms, a halogen atom, an aryl group containing 6 to 10 carbon atoms, a hydroxy group, an amino group, an acylamino group containing 1 to 10 carbon atoms, an alkylsulfonylamino group containing 1 to 10 carbon atoms, a carbamoyl group containing 1 to 10 carbon atoms, a sulfamoyl group containing 0 to 10 carbon atoms, a carboxyl group, an alkoxycarbonyl group containing 2 to 10 carbon atoms, an acyloxy group containing 2 to 12 carbon atoms, a heterocyclic group, a cyano group and a nitro group.

8. A method for producing a compound represented by the following formula (J-4):

which comprises reacting a compound represented by the following formula (J-3):

with a chlorinating agent selected from phosphorous oxychloride, thionyl chloride, phosphorus pentachloride, phosphorus trichloride, pyrocatechyl phosphotrichloride, dichlorotriphenylphosphorane and oxalyl chloride, or a combination thereof;

wherein, in formula (J-3) and formula (J-4),

R 2 represents an alkyl group or an aryl group; wherein said alkyl group and aryl group may be optionally substituted with one or more substituents selected from substituent group A;

substituent group A: an aryl group containing 1 to 10 carbon atoms, an alkenyl group containing 2 to 10 carbon atoms, an alkynyl group containing 2 to 10 carbon atoms, an alkoxy group containing 1 to 10 carbon atoms, an aryloxy group containing 6 to 10 carbon atoms, a halogen atom, an aryl group containing 6 to 10 carbon atoms, a hydroxy group, an amino group, an acylamino group containing 1 to 10 carbon atoms, an alkylsulfonylamino group containing 1 to 10 carbon atoms, a carbamoyl group containing 1 to 10 carbon atoms, a sulfamoyl group containing 0 to 10 carbon atoms, a carboxyl group, an alkoxycarbonyl group containing 2 to 10 carbon atoms, an acyloxy group containing 2 to 12 carbon atoms, a heterocyclic group, and a nitro group.

9. A method for producing a compound represented by the following formula (J-5):

which comprises reacting a compound represented by the following formula (J-4):

with a fluorinating agent selected from the group consisting of potassium fluoride, cesium fluoride, tetra-n-butylammonium fluoride, tetramethylammonium fluoride, tetraphenylphosphonium fluoride or a combination thereof, in the presence of 2,4-dinitrochlorobenzene or 2,4-dinitrofluorobenzene,

where, in formula (J-4) and formula (J-5),

R 2 represents an alkyl group or an aryl group; wherein said alkyl group and aryl group may be optionally substituted with one or more substituents selected from substituent group A;

substituent group A: an alkyl group containing 1 to 10 carbon atoms, an alkenyl group containing 2 to 10 carbon atoms, an alkynyl group containing 2 to 10 carbon atoms, an alkoxy group containing 1 to 10 carbon atoms, an aryloxy group containing 6 to 10 carbon atoms, a halogen atom, an aryl group containing 6 to 10 carbon atoms, a hydroxy group, an amino group, an acylamino group containing 1 to 10 carbon atoms, an alkylsulfonylamino group containing 1 to 10 carbon atoms, a carbamoyl group containing 1 to 10 carbon atoms, a sulfamoyl group containing 0 to 10 carbon atoms, a carboxyl group, an alkoxycarbonyl group containing 2 to 10 carbon atoms, an acyloxy group containing 2 to 12 carbon atoms, a heterocyclic group, a cyano group, and a nitro group.