Methods of synthesis and/or purification of diaminophenothiazinium compounds
US11045477B2 · kind B2 · utility
2Cited by
9References
27Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 15, 2019 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Nov 15, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/30
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Disclosed are methods of synthesis and/or purification of certain 3,7-diamino-phenothiazin-5-ium compounds (“diaminophenothiazinium compounds”) including Methylthioninium Chloride (MTC) (Methylene Blue), and the resulting high purity characterized by a purity greater than 98%, and very low levels of heavy metals and organic impurities Azure A, B, C and MVB. Also disclosed are methods of treatment of a tauopathy or methemoglobinemia in a patient in need thereof, comprising administering to the patient a therapeutically effective amount of the high-purity diaminophenothiazinium compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.