Method for producing antibody-drug conjugate

1. A method for producing a compound represented by formula (C):

wherein R 1 represents an amino group protected with a protecting group,

the method comprising a step of subjecting a compound represented by formula (B):

wherein R 1 represents the same meaning as above, to intramolecular cyclization to convert the compound represented by formula (B) into the compound represented by formula (C).

2. The production method according to claim 1 , wherein R 1 is an amino group protected with an acetyl group, a methoxyacetyl group, a trifluoroacetyl group, a trichloroacetyl group, a pivaloyl group, a formyl group, or a benzoyl group.

3. The production method according to claim 1 , wherein R 1 is an amino group protected with an acetyl group or a trifluoroacetyl group.

4. The production method according to claim 1 , wherein R 1 is an amino group protected with an acetyl group.

5. The production method according to claim 1 , wherein the intramolecular cyclization is performed by a method comprising reacting the compound represented by formula (B) with trifluoroacetic anhydride.

6. The production method according to claim 5 , wherein the intramolecular cyclization is performed in a solvent comprising trifluoroacetic acid.

7. The production method according to claim 1 , wherein the intramolecular cyclization is performed by a method comprising reacting the compound represented by formula (B) with thionyl chloride.

8. The production method according to claim 7 , wherein the intramolecular cyclization is performed in the presence of aluminium chloride.

9. A method for producing a compound represented by formula (C):

wherein R 1 represents an amino group protected with a protecting group,

the method comprising a step of subjecting a compound represented by formula (J):

wherein Y represents a leaving group, and R 1 represents the same meaning as above, to intramolecular cyclization to convert the compound represented by formula (J) into the compound represented by formula (C).

10. The production method according to claim 9 , wherein R 1 is an amino group protected with an acetyl group, a methoxyacetyl group, a trifluoroacetyl group, a trichloroacetyl group, a pivaloyl group, a formyl group, or a benzoyl group.

11. The production method according to claim 9 , wherein R 1 is an amino group protected with an acetyl group or a trifluoroacetyl group.

12. The production method according to claim 9 , wherein R 1 is an amino group protected with an acetyl group.

13. The production method according to claim 9 , wherein Y is a chloro group.

14. The production method according to claim 9 , wherein Y is a trifluoroacetoxy group.

15. The production method according to claim 13 , wherein the intramolecular cyclization is performed in the presence of aluminium chloride.

16. The production method according to claim 14 , wherein the intramolecular cyclization is performed in a solvent comprising trifluoroacetic acid.

17. A method for producing a compound represented by formula (C):

wherein R 1 represents an amino group protected with a protecting group,

the method comprising the steps of:

coupling a compound represented by formula (D):

wherein X represents a leaving group, and R 1 represents the same meaning as above, with 3-butenoic acid to convert the compound represented by formula (D) into a compound represented by formula (E):

wherein R 1 represents the same meaning as above; then

reducing the compound represented by formula (E) to convert the compound represented by formula (E) into a compound represented by formula (B):

wherein R 1 represents the same meaning as above; and then

subjecting the compound represented by formula (B) to intramolecular cyclization to convert the compound represented by formula (B) into the compound represented by formula (C).

18. The production method according to claim 17 , wherein X is a bromo group, an iodo group, a trifluoromethanesulfonyloxy group, or an arylsulfonyloxy group.

19. The production method according to claim 17 , wherein X is a bromo group.

20. The production method according to claim 17 , wherein X is an iodo group.

21. The production method according to claim 17 , wherein R 1 is an amino group protected with an acetyl group, a methoxyacetyl group, a trifluoroacetyl group, a trichloroacetyl group, a pivaloyl group, a formyl group, or a benzoyl group.

22. The production method according to claim 17 , wherein R 1 is an amino group protected with an acetyl group or a trifluoroacetyl group.

23. The production method according to claim 17 , wherein R 1 is an amino group protected with an acetyl group.

24. The production method according to claim 17 , wherein the step of coupling the compound represented by formula (D) with 3-butenoic acid to convert the compound represented by formula (D) into the compound represented by formula (E) is performed in the presence of a palladium complex prepared from palladium(II) acetate and tri(o-tolyl)phosphine.

25. The production method according to claim 17 , comprising the steps of: dissolving the compound represented by formula (E) in a basic aqueous solution to wash the compound represented by formula (E) with a first organic solvent and separating the solvents; and then adding an acid to the basic aqueous solution to extract the compound represented by formula (E) with a second organic solvent and separating the solvents.

26. The production method according to claim 25 , wherein the first organic solvent is 2-methyltetrahydrofuran.

27. The production method according to claim 25 , wherein the second organic solvent is 2-methyltetrahydrofuran.

28. The production method according to claim 25 , wherein the basic aqueous solution is an aqueous sodium hydroxide solution.

29. The production method according to claim 17 , wherein the step of reducing the compound represented by formula (E) to convert the compound represented by formula (E) into the compound represented by formula (B) is performed by a method comprising reacting the compound represented by formula (E) with hydrogen in a solvent in the presence of a palladium carbon catalyst.

30. The production method according to claim 17 , wherein the step of subjecting the compound represented by formula (B) to intramolecular cyclization to convert the compound represented by formula (B) into the compound represented by formula (C) is performed by a method comprising reacting the compound represented by formula (B) with trifluoroacetic anhydride.

31. The production method according to claim 30 , wherein the intramolecular cyclization is performed in a solvent comprising trifluoroacetic acid.

32. The production method according to claim 17 , wherein the step of subjecting the compound represented by formula (B) to intramolecular cyclization to convert the compound represented by formula (B) into the compound represented by formula (C) is performed by a method comprising reacting the compound represented by formula (B) with thionyl chloride.

33. The production method according to claim 32 , wherein the intramolecular cyclization is performed in the presence of aluminium chloride.

34. A method for producing a compound represented by formula (2):

wherein a compound represented by formula (C):

produced by the method according to claim 1 is used as a starting material, the method comprising the steps of:

converting the compound represented by formula (C) into a compound represented by formula (F):

wherein R 1 represents the same meaning as defined in claim 1 , and R 2 represents an amino group protected with a protecting group; then

converting the compound represented by formula (F) into a compound represented by formula (G):

wherein R 2 represents the same meaning as above; then

condensing the compound represented by formula (G) with a compound represented by formula (1):

to convert the compound represented by formula (G) into a compound represented by formula (H):

wherein R 2 represents the same meaning as above; and then

converting the compound represented by formula (H) into the compound represented by formula (2).

35. The production method according to claim 34 , wherein R 2 is an amino group protected with an acetyl group, a methoxyacetyl group, a trifluoroacetyl group, a trichloroacetyl group, a pivaloyl group, a formyl group, or a benzoyl group.

36. The production method according to claim 34 , wherein R 2 is an amino group protected with an acetyl group or a trifluoroacetyl group.

37. The production method according to claim 34 , wherein R 2 is an amino group protected with an acetyl group.

38. The production method according to claim 34 , wherein the step of converting the compound represented by formula (C) into the compound represented by formula (F) comprises the sub-steps of: (i) reacting the compound represented by formula (C) with a nitrous acid ester in the presence of a base to introduce a nitroso group; (ii) introducing a protecting group to a nitrogen atom derived from the nitroso group; and (iii) reducing the compound represented by formula (C) with hydrogen in the presence of a platinum carbon catalyst.

39. The production method according to claim 34 , wherein the step of converting the compound represented by formula (F) into the compound represented by formula (G) is performed in a solvent comprising hydrochloric acid/ethanol.

40. The production method according to claim 34 , wherein the step of condensing the compound represented by formula (G) with the compound represented by formula (1) to convert the compound represented by formula (G) into the compound represented by formula (H) is performed in a solvent comprising o-cresol.

41. The production method according to claim 34 , wherein the step of converting the compound represented by formula (H) into the compound represented by formula (2) is performed in a solvent comprising methanesulfonic acid.

42. The production method according to claim 34 , wherein the compound represented by formula (2) is in the form of a methanesulfonic acid salt.

43. The production method according to claim 34 , wherein the compound represented by formula (2) is in the form of a methanesulfonic acid salt m-hydrate wherein m is in a range of 0 to 3.

44. The production method according to claim 34 , wherein the compound represented by formula (2) is in the form of a methanesulfonic acid salt dihydrate.

45. A method for producing a compound represented by formula (2):

wherein the method comprises the steps of:

converting a compound represented by formula (3):

into a compound represented by formula (4):

then

converting the compound represented by formula (4) into a compound represented by formula (5):

then

converting the compound represented by formula (5) into a compound represented by formula (6):

then

coupling the compound represented by formula (6) with 3-butenoic acid to convert the compound represented by formula (6) into a compound represented by formula (7):

then

converting the compound represented by formula (7) into a compound represented by formula (8):

then

subjecting the compound represented by formula (8) to intramolecular cyclization to convert the compound represented by formula (8) into a compound represented by formula (9):

then

converting the compound represented by formula (9) into a compound represented by formula (10):

then

converting the compound represented by formula (10) into a compound represented by formula (11):

then

condensing the compound represented by formula (11) with a compound represented by formula (1):

to convert the compound represented by formula (11) into a compound represented by formula (12):

and then

converting the compound represented by formula (12) into the compound represented by formula (2).

46. The production method according to claim 45 , wherein the step of coupling the compound represented by formula (6) with 3-butenoic acid to convert the compound represented by formula (6) into the compound represented by formula (7) is performed in the presence of a palladium complex prepared from palladium(II) acetate and tri(o-tolyl)phosphine.

47. The production method according to claim 45 , comprising the steps of: dissolving the compound represented by formula (7) in a basic aqueous solution to wash the compound represented by formula (7) with a first organic solvent and separating the solvents; and then adding an acid to the basic aqueous solution to extract the compound represented by formula (7) with a second organic solvent and separating the solvents.

48. The production method according to claim 47 , wherein the first organic solvent is 2-methyltetrahydrofuran.

49. The production method according to claim 47 , wherein the second organic solvent is 2-methyltetrahydrofuran.

50. The production method according to claim 46 , wherein the basic aqueous solution is an aqueous sodium hydroxide solution.

51. The production method according to claim 45 , wherein the step of subjecting the compound represented by formula (8) to intramolecular cyclization to convert the compound represented by formula (8) into the compound represented by formula (9) is performed by a method comprising reacting the compound represented by formula (8) with trifluoroacetic anhydride.

52. The production method according to claim 51 , wherein the intramolecular cyclization is performed in a solvent comprising trifluoroacetic acid.

53. The production method according to claim 45 , wherein the step of converting the compound represented by formula (9) into the compound represented by formula (10) comprises the sub-steps of: (i) reacting the compound represented by formula (9) with a nitrous acid ester in the presence of a base to introduce a nitroso group; then (ii) introducing a protecting group to a nitrogen atom derived from the nitroso group; and (iii) reducing the compound represented by formula (9) with hydrogen in the presence of a platinum carbon catalyst.

54. The production method according to claim 45 , wherein the step of converting the compound represented by formula (10) into the compound represented by formula (11) is performed in a solvent comprising hydrochloric acid/ethanol.

55. The production method according to claim 45 , wherein the step of condensing the compound represented by formula (11) with the compound represented by formula (1) to convert the compound represented by formula (11) into the compound represented by formula (12) is performed in a solvent comprising o-cresol.

56. The production method according to claim 45 , wherein the step of converting the compound represented by formula (12) into the compound represented by formula (2) is performed in a solvent comprising methanesulfonic acid.

57. The production method according to claim 45 , wherein the compound represented by formula (2) is in the form of a methanesulfonic acid salt.

58. The production method according to claim 45 , wherein the compound represented by formula (2) is in the form of a methanesulfonic acid salt m-hydrate wherein m is in a range of 0 to 3.

59. The production method according to claim 45 , wherein the compound represented by formula (2) is in the form of a methanesulfonic acid salt dihydrate.

60. The production method according to claim 1 , wherein no chromatography is used.

61. A compound represented by formula (7):

62. A compound represented by formula (8):

63. A method for producing a compound represented by formula (14):

wherein a compound represented by formula (2):

[Chem. 31]

produced by the method according to claim 34 is used as a starting material, the method comprising the steps of:

condensing the compound represented by formula (2) with a compound represented by formula (13):

to convert the compound represented by formula (2) into the compound represented by formula (14).

64. A method for producing an antibody-drug conjugate, in which a drug-linker represented by formula (15):

wherein A represents the connecting position to an antibody;

is conjugated to the antibody via a thioether bond,

wherein a compound represented by formula (14):

produced by the method according to claim 63 is used as a raw material,

the method comprising the steps of:

(i) reducing an antibody; and then

(ii) reacting the compound represented by formula (14) produced by the method with the reduced antibody.

65. The production method according to claim 64 , wherein the antibody is an anti-HER2 antibody, an anti-HER3 antibody, an anti-TROP2 antibody, an anti-B7-H3 antibody, or an anti-GPR20 antibody.