Benzopyrone derivatives exhibiting anti-allergic activity

US4092416A · kind A · utility

Assignee

• Boehringer Mannheim GmbH · DE

Inventors

• Werner Winter · Aachen, DE
• Max Thiel
• Kurt Stach
• Androniki Roesch · Mannheim, DE
• by Werner Plattner, administrator · Linz, AT
• Wolfgang Schaumann · Heidelberg, DE

Key dates

• Filing date: Dec 1, 1976
• Grant date: May 30, 1978
• Expiry date: Dec 1, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D317/22
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Benzopyrones of the formula ##STR1## wherein R.sub.1 is a hydrogen or halogen atom or a hydroxyl, lower alkyl, alkoxy, alkylthio or trifluoromethyl radical, PA1 R.sub.2, r.sub.3, r.sub.4 and R.sub.5 each independently is hydrogen, a halogen atom, a hydroxyl radical, a lower alkyl or lower alkoxy radical, or a lower alkyl or lower alkoxy radical substituted by at least one of hydroxyl, halogen, mesyloxy or tosyloxy or by an oxirane, dioxane or dioxolane ring, PA1 A is a lower alkylene radical, and PA1 n is 0, 1 or 2, And salts thereof exhibit anti-allergic activity.