IP Library › Granted Patent US 12,324,810
Granted Patent B2
US 12,324,810 · App. 18/595,985 · Granted Jun 10, 2025

3, 7-diamino-10H-phenothiazine salts and their use

Inventors: Claude Michel Wischik (Aberdeen, GB); Janet Elizabeth Rickard (Aberdeen, GB); Charles Robert Harrington (Aberdeen, GB); David Horsley (Aberdeen, GB); John Mervyn David Storey (Aberdeen, GB); Colin Marshall (Aberdeen, GB); James Peter Sinclair (Aberdeen, GB); Thomas Craven Baddeley (Aberdeen, GB)
Assignee: WisTa Laboratories Ltd.
A61K31/5415C07D279/20C07D279/22C09B21/00Y02A50/30
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Quick Facts
Patent No.
US 12,324,810
App. No.
18/595,985
Granted
Jun 10, 2025
Kind
B2
Abstract

Described are methods of preparing reduced 3,7-diamino-10H-phenothiazine (DAPTZ) compounds of formula: wherein: R 1 and R 9 are independently selected from: —H; C 1-4 alkyl; C 2-4 alkenyl; and halogenated C 1-4 alkyl; each of R 3NA and R 3NB is independently selected from: —H; C 1-4 alkyl; C 2-4 alkenyl; and halogenated C 1-4 alkyl; each of R 7NA and R 7NB is independently selected from: —H; C 1-4 alkyl; C 2-4 alkenyl; and halogenated C 1-4 alkyl; each of HX 1 and HX 2 is independently a protic acid; and pharmaceutically acceptable salts, solvates, and hydrates thereof. These methods are particularly useful for producing stable reduced forms, and with high purity. The stability and purity are especially relevant for pharmaceutical compositions for the treatment of disease. The compounds are useful for treatment of e.g. tauopathies, such as Alzheimer's disease, and also as prodrugs for the corresponding oxidized thioninium drugs.

Claims (34)

1. A method of treatment of fronto-temporal dementia in a subject in need thereof,

the method comprising administering to the subject a therapeutically effective amount of a bis protic acid salt compound of the following formula:

wherein:

each of R 1 and R 9 is independently selected from the group consisting of: —H, C 1-4 alkyl, C 2-4 alkenyl, and halogenated C 1-4 alkyl;

each of R 3NA and R 3NB is independently selected from the group consisting of: —H, C 1-4 alkyl, C 2-4 alkenyl, and halogenated C 1-4 alkyl;

each of R 7NA and R 7NB is independently selected from the group consisting of: —H, C 1-4 alkyl, C 2-4 alkenyl, and halogenated C 1-4 alkyl; and

each of HX 1 and HX 2 is independently a protic acid, wherein if any of HX 1 or HX 2 is a hydrohalic acid, then each is independently selected from the group consisting of HCl and HBr.

2. The method according to claim 1 , wherein each of R 1 and R 9 is independently —H, -Me, -Et, or —CF 3 .

3. The method according to claim 1 , wherein each of R 1 and R 9 is independently —H, -Me, or -Et.

4. The method according to claim 1 , wherein R 1 and R 9 are the same.

5. The method according to claim 1 , wherein each of R 1 and R 9 is independently —H.

6. The method according to claim 1 , wherein each of R 3NA and R 3NB is independently -Me, -Et, -nPr, -nBu, —CH 2 —CH═CH 2 , or —CF 3 .

7. The method according to claim 1 , wherein R 3NA and R 3NB are the same.

8. The method according to claim 1 , wherein each of R 7NA and R 7NB is independently -Me, -Et, -nPr, -nBu, —CH 2 —CH═CH 2 , or —CF 3 .

9. The method according to claim 1 , wherein R 7NA and R 7NB are the same.

10. The method according to claim 1 , with the proviso that:

at least one of R 3NA and R 3NB and R 7NA and R 7NB is other than-Et.

11. The method according to claim 1 , with the proviso that:

if: each of R 1 and R 9 is —H;

then: R 3NA and R 3NB and R 7NA and R 7NB are not each -Et.

12. The method according to claim 1 , wherein each of the groups —N(R 3NA )(R 3NB ) and —N(R 7NA )(R 7NB ) is independently selected from the group consisting of: -NMe 2 , -NEt 2 , —N(nPr) 2 , —N(Bu) 2 , —NMeEt, —NMe(nPr), and —N(CH 2 CH═CH 2 ) 2 .

13. The method according to claim 1 , wherein the groups —N(R 3NA )(R 3NB ) and —N(R 7NA )(R 7NB ) are the same, and are selected from the group consisting of: —NMe 2 and —NEt 2 .

14. The method according to claim 1 , wherein the groups —N(R 3NA )(R 3NB ) and —N(R 7NA )(R 7NB ) are the same.

15. The method according to claim 1 , with the proviso that: each of the groups —N(R 3NA )(R 3NB ) and —N(R 7NA )(R 7NB ) is other than —NEt 2 .

16. The method according to claim 1 , wherein the groups —N(R 3NA )(R 3NB ) and —N(R 7NA )(R 7NB ) are the same, and are selected from the group consisting of: —NMe 2 , —N(nPr) 2 , —N(Bu) 2 , —NMeEt, —NMe(nPr), and —N(CH 2 CH═CH 2 ) 2 .

17. The method according to claim 1 , wherein each of the groups —N(R 3NA )(R 3NB ) and —N(R 7NA )(R 7NB ) is: —NMe 2 .

18. The method according to claim 1 , wherein each of HX 1 and HX 2 is independently a monoprotic acid.

19. The method according to claim 1 , wherein each of HX 1 and HX 2 is independently a hydrohalide acid.

20. The method according to claim 1 , wherein each of HX 1 and HX 2 is independently an organic acid.

21. The method according to claim 1 , wherein the compound is administered as a pharmaceutical composition comprising the compound and a pharmaceutically acceptable carrier or diluent.

22. The method according to claim 21 , wherein the pharmaceutical composition is a dosage unit which comprises 20 to 300 mg of the compound.

23. The method according to claim 22 , wherein the pharmaceutical composition is a dosage unit which comprises about 30 mg of the compound.

24. The method according to claim 22 , wherein the dosage unit is a tablet or capsule.

25. The method according to claim 1 , wherein the administering is oral.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 9, 2024
From: WISCHIK, CLAUDE MICHEL; STOREY, JOHN MERVYN DAVID; MARSHALL, COLIN; SINCLAIR, JAMES PETER; BADDELEY, THOMAS CRAVEN; RICKARD, JANET ELIZABETH; HARRINGTON, CHARLES ROBERT; HORSLEY, DAVID
To: THE UNIVERSITY COURT OF THE UNIVERSITY OF ABERDEEN
Reel/Frame 068235/0343 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 9, 2024
From: THE UNIVERSITY COURT OF THE UNIVERSITY OF ABERDEEN
To: TAURX THERAPEUTICS LTD
Reel/Frame 068235/0366 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 9, 2024
From: TAURX THERAPEUTICS LTD
To: WISTA LABORATORIES LTD.
Reel/Frame 068236/0274 →
Continuity (7)
Continuation 17591306 · Feb 2, 2022
Continuation 14929111 · Oct 30, 2015
Division 14248730 · Apr 9, 2014
Continuation 13011797 · Jan 21, 2011
Continuation 12294599
Provisional Application 60786690 · Mar 29, 2006
Related Publication 20240245700A1 · Jul 25, 2024
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