Process for preparing and purifying 1,7′-dimethyl-2′-propyl-2,5′-bi-1H-benzimidazole

US6770762B2 · kind B2 · utility

Assignee

• BOEHRINGER INGELHEIM PHARMA GMBH & CO. KG · DE

Inventors

• Werner Belzer · Sankt Goar, DE
• Rolf Dach · Gau-Algesheim, DE
• Volker Fachinger · Wangen im Allgäu, DE
• Markus Heitzmann · Ingelheim am Rhein, DE
• Hartmut Schmidt · Bockenau, DE

Key dates

• Filing date: Jan 16, 2003
• Grant date: Aug 3, 2004
• Expiry date: Jan 16, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D235/18
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed is a process which can be used on an industrial scale for preparing and purifying 1,7′-dimethyl-2′-propyl-2,5′-bi-1H-benzimidazole in which the crude product is subjected to charcoal treatment.