The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 2016
Filed:
Oct. 16, 2013
Interquim, S.a., Sant Cugat del Vallés—Barcelona, ES;
Josep Salaet Ferre, Sant Cugat del Vallés—Barcelona, ES;
Francisco Marquillas Olondriz, Sant Cugat del Vallés—Barcelona, ES;
Interquim, S.A., Barcelona, ES;
Abstract
The invention relates to a process for the preparation of Roflumilast by reaction of an activated form of 3-(cyclopropylmethoxy)-4-(difluoromethoxy)-benzoic acid with an activating agent selected from (a) carbonyldiimidazole (CDI), (b) 1,1'-carbonyl-di-(1,2,4-triazol) (CDT), (c) 1,1′-carbonyl-bis-(2-methylimidazol), (d), 1′-carbonyl-dipyperidin, (e) N,N′-dicyclohexylcarbodiimide (DCC), (f) N,N′-diisopropylcarbodiimide (DIC), (g) 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and a combination of one of the previous (a)-(g) with (h) N-hydroxysuccinimide or (i) N-hydroxyphthalimide, and the subsequent reaction with 3,5-dichloropyridine-4-amine in the presence of an inorganic base. The invention also relates to the synthesis intermediates.