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:
Aug. 26, 2025
Filed:
Oct. 12, 2020
Bayer Aktiengesellschaft, Leverkusen, DE;
Johannes Platzek, Berlin, DE;
Kai Lovis, Düsseldorf, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
The invention relates to a method for preparing racemic (4R,4S)-4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1,6-naphthyridine-3-carboxamide of the formula (I) from the enantiomers (Ia) or (Ib); a method for preparing (4S)-4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1,6-naphthyridine-3-carboxamide of the formula (Ia); a method for preparing racemic (4R,4S)-4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1,6-naphthyridine-3-carboxamide of the formula (I) from the pyridine of the formula (II). The objects of the invention have in common the irradiation of the compound of the formulae (Ia), (Ib) and/or (II) with light in a suitable solvent, or solvent mixture, in the presence of a base. The compounds of the formulae (Ia), (Ib) and/or (II) are intermediates, by-products or target compounds in the synthesis of finerenone (compound according to formula (Ia)).