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:
Jan. 20, 2026
Filed:
Oct. 15, 2020
Otsuka Pharmaceutical Co., Ltd., Tokyo, JP;
OTSUKA PHARMACEUTICAL CO., LTD., Tokyo, JP;
Abstract
The present invention addresses the problem of finding a method for reliably producing (1R,5S)-1-(naphthalen-2-yl)-3-azabicyclo[3.1.0]hexane hydrochloride, wherein crystalline polymorphs can be controlled with industrially easy operations. Provided is a method for producing a crystalline form of (1R,5S)-1-(naphthalen-2-yl)-3-azabicyclo[3.1.0]hexane hydrochloride, the method comprising: step (a) for heating and dissolving (1R,5S)-1-(naphthalen-2-yl)-3-azabicyclo[3.1.0]hexane hydrochloride in a solvent including an alcohol-based solvent; step (b) for cooling the dissolved product of step (a) to a temperature, at which crystals of (1R,5S)-1-(naphthalen-2-yl)-3-azabicyclo[3.1.0]hexane hydrochloride precipitate, to nucleate the crystals; step (c) for heating a mixture containing the crystals obtained by nucleation to a temperature at which only a specific crystalline form selectively remains; and step (d) for cooling the mixture heated in step (c) to obtain the crystalline form.