Process for preparing 1,2,4-benzotriazine oxides

US5175287A · kind A · utility

Assignee

• SRI International · US

Inventors

• William W. Lee · Arcadia, US
• J. Martin Brown · Redwood City, US
• Edward W. Grange · Palo Alto, US
• Abelardo P. Martinez · San Jose, US
• Michael Tracy · Palo Alto, US
• Daniel J. Pollart · Alameda, US

Key dates

• Filing date: Sep 18, 1989
• Grant date: Dec 29, 1992
• Expiry date: Sep 18, 2009

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K41/0038
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A method of using 1,2,4-benzotriazine oxides, some of which are novel compounds, as radiosensitizers and selective cytotoxic agents is disclosed. These compounds are shown to specifically radiosensitize hypoxic tumor cells. Some are additionally disclosed to be useful as specific cytotoxic agents for these cells. They also show an unexpected ability to radiosensitize aerobic cells following or preceding a hypoxic incubation of the cells with the drug. This provides a basis for selective radiosensitization of tumors compared to normal cells. A novel method for preparing the 1,2,4-benzotriazine oxides is also disclosed.