Process for obtaining 3,7-dialkylxanthines from 3-alkyl-xanthines

US5475107A · kind A · utility

Assignee

• Hoechst Roussel Pharmaceuticals · US

Inventors

• Gerhard Korb · Großkrotzenburg, DE
• Hans-Wolfram Flemming · Usingen, DE

Key dates

• Filing date: Nov 9, 1993
• Grant date: Dec 12, 1995
• Expiry date: Nov 9, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D473/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for obtaining 3,7-dialkylxanthines from 3-alkyl-xanthines 3,7-Dialkylxanthines are obtained from the corresponding 3-alkylxanthines using an alkylating agent in the presence of quaternary ammonium and/or phosphonium compounds and, where appropriate, of additional polyethers in a two-phase mixture.