Esters of 5-aminolevulinic acid as photosensitizing agents in photochemotherapy

US6492420B2 · kind B2 · utility

Assignee

• PHOTOCURE ASA · NO

Inventors

• Karl E. Gierskcky · Sandefjord, NO
• Johan Moan · Oslo, NO
• Qian Peng · Oslo, NO
• Harald Steen · Oslo, NO
• Trond Warloe · Oslo, NO
• Alf Bjorseth · Oslo, NO

Key dates

• Filing date: Dec 21, 1999
• Grant date: Dec 10, 2002
• Expiry date: May 14, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C229/22
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention relates to compounds being esters of 5-aminolevulinic acids or pharmaceutically acceptable salts thereof, including compounds of formula (I) R22N—CH2COCH2—CH2CO—OR1 (wherein R1 may represent alkyl optionally substituted by hydroxy, alkoxy, acyloxy, alkoxycarbonyloxy, amino, aryl, oxo or fluoro groups and optionally interrupted by oxygen, nitrogen, sulphur or phosphorus atoms; and R2 represents a hydrogen atom or a group R1, and both R2 groups may be the identical or different), and their use in diagnosis and photochemotherapy of disorders or abnormalities of external or internal surfaces of the body, and products and kits for performing the invention.