Method for producing triazine compound

1. A method for producing a compound represented by formula I:

or a salt thereof, said method comprising a step of reacting a compound represented by formula IV:

or a salt thereof with a base in water, and optionally comprising a step of forming a salt thereof;

wherein ring A represents an optionally substituted aryl group or an optionally substituted heteroaryl group.

2. The method according to claim 1 , said method comprising a step of reacting a compound represented by formula III:

a salt thereof, or a derivative thereof with aminourea or a salt thereof in water to produce the compound represented by formula IV or a salt thereof, and then a step of subjecting the resulting compound or a salt thereof to the step(s) according to claim 1 ;

wherein the derivative of formula (III) is a compound represented by formula (III′):

 and

wherein ring A represents an optionally substituted aryl group or an optionally substituted heteroaryl group.

3. The method according to claim 2 , said method comprising a step of subjecting the compound represented by formula IV or a salt thereof without isolation to the step(s) according to claim 1 .

4. The method according to claim 3 , said method comprising a step of collecting the compound represented by formula IV or a salt thereof by filtration.

5. The method according to claim 2 , said method comprising a step of reacting a compound represented by formula II:

or a salt thereof with a glyoxalization reagent to produce the compound represented by formula III, a salt thereof, or the derivative thereof, and then a step of subjecting the resulting compound, a salt thereof, or the derivative thereof to the step(s) according to claim 2 ;

wherein ring A represents an optionally substituted aryl group or an optionally substituted heteroaryl group.

6. The method according to claim 5 , said method comprising a step of subjecting the compound represented by formula III, a salt thereof, or the derivative thereof without isolation to the step(s) according to claim 2 .

7. The method according to claim 1 , wherein ring A is an optionally substituted monocyclic or bicyclic aryl group.

8. The method according to claim 7 , wherein ring A is a monocyclic or bicyclic aryl group optionally substituted with 1 to 3 group(s) independently selected from the group consisting of a halogen atom, an alkyl group, and an alkoxy group.

9. A method for producing a compound represented by formula V:

or a pharmaceutically acceptable salt thereof, said method comprising

a step of producing a compound represented by formula I:

or a salt thereof by reacting a compound represented by formula IV:

or a salt thereof with a base in water, and optionally comprising a step of forming a salt thereof, and then

a step of producing the compound represented by formula V or a pharmaceutically acceptable salt thereof by a known method;

wherein ring A represents an optionally substituted aryl group or an optionally substituted heteroaryl group and R B represents an optionally substituted aliphatic heterocyclic group.

10. The method according to claim 9 , wherein

ring A is an optionally substituted monocyclic or bicyclic aryl group; and

R B is a group represented by formula VI:

wherein X a represents CR 3a or N;

(i) when X a represents CR 3a , then

X b represents CHR 3b and X c represents O or NR 4c ,

X b represents O and X c represents NR 4c , or

X b represents NR 4b and X c represents O, NR 4c , or CHR 3c ;

(ii) when X a represents N, then

X b represents CHR 3b or C(═O) and X c represents NR 4c , or

X b represents NR 4b and X c represents CHR 3c ;

R 3a represents a hydrogen atom, a hydroxy group, an alkyl group, or an amino group;

R 3b and R 3c represent each a group independently selected from the group consisting of a hydrogen atom, a hydroxy group, and an alkyl group;

R 4b and R 4c represent each a group independently selected from the group consisting of a hydrogen atom, an alkyl group, and a cycloalkyl group;

R 1 represents a hydrogen atom or an alkyl group;

R 2 represents

(i) an optionally substituted alkyl group,

(ii) an optionally substituted cycloalkyl group,

(iii) an optionally substituted aliphatic heterocyclic group,

(iv) an optionally partially hydrogenated and optionally substituted heteroaryl group, or

(v) a hydrogen atom, or

when X c represents NR 4c , then R 2 and R 4c are combined with each other at their terminals together with the nitrogen atom to which they are attached to form an aliphatic heterocyclic group optionally substituted with an optionally substituted alkyl group; and

the wavy line represents the point of attachment to the rest of molecule.

11. The method according to claim 10 , wherein

ring A is a monocyclic or bicyclic aryl group optionally substituted with 1 to 3 group(s) independently selected from the group consisting of a halogen atom, an alkyl group, and an alkoxy group;

R B is a group represented by formula VI;

X a represents N;

X b represents CHR 3b or C(═O);

X c represents NR 4c ;

R 3b represents a group independently selected from the group consisting of a hydrogen atom, a hydroxy group, and an alkyl group;

R 4c represents a group independently selected from the group consisting of a hydrogen atom, an alkyl group, and a cycloalkyl group;

R 1 represents a hydrogen atom or an alkyl group;

R 2 represents

(i) an optionally substituted alkyl group,

(ii) an optionally substituted cycloalkyl group,

(iii) an optionally substituted aliphatic heterocyclic group,

(iv) an optionally partially hydrogenated and optionally substituted heteroaryl group, or

(v) a hydrogen atom, or

R 2 and R 4c are combined with each other at their terminals together with the nitrogen atom to which they are attached to form an aliphatic heterocyclic group optionally substituted with an optionally substituted alkyl group.

12. The method according to claim 11 , wherein

ring A is a monocyclic or bicyclic aryl group optionally substituted with 1 to 3 group(s) independently selected from the group consisting of a halogen atom, an alkyl group, and an alkoxy group;

R B is a group represented by formula VI;

X a represents N;

X b represents CHR 3b ;

X c represents NR 4c ;

R 3b represents a group independently selected from the group consisting of a hydrogen atom, a hydroxy group, and an alkyl group;

R 4c represents a group independently selected from the group consisting of a hydrogen atom, an alkyl group, and a cycloalkyl group;

R 1 represents a hydrogen atom or an alkyl group;

R 2 represents

(i) an optionally substituted alkyl group,

(ii) an optionally substituted cycloalkyl group, or

(iii) an optionally substituted aliphatic heterocyclic group.

13. The method according to claim 12 , wherein

ring A is a monocyclic aryl group optionally substituted with 1 to 3 group(s) independently selected from the group consisting of a halogen atom, an alkyl group, and an alkoxy group;

R B is a group represented by formula VI;

X a represents N;

X b represents CH 2 ;

X c represents NH;

R 1 represents a hydrogen atom;

R 2 represents an optionally substituted cycloalkyl group.

14. The method according to claim 13 , wherein

ring A is a phenyl group optionally substituted with 1 to 3 group(s) independently selected from the group consisting of a halogen atom, an alkyl group, and an alkoxy group;

R B is a group represented by formula VI;

X a represents N;

X b represents CH 2 ;

X c represents NH;

R 1 represents a hydrogen atom;

R 2 represents an optionally substituted cyclohexyl group.

15. The method according to claim 14 , wherein

ring A is 4-methylphenyl;

R B is a group represented by formula VI;

X a represents N;

X b represents CH 2 ;

X c represents NH;

R 1 represents a hydrogen atom;

R 2 represents an optionally substituted cyclohexyl group.