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:
Jun. 26, 2001
Filed:
Oct. 01, 1999
Applicant:
Inventors:
Masaki Ogawa, Yachiyo, JP;
Fumio Kita, Yachiyo, JP;
Assignee:
SSP Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
A method of preparing oxoquazepam which comprises reacting 2,2,2-trifluoroethyl trifluoromethanesulfonate with 7-chloro-1,3-dihydro-5-(2-fluorophenyl)-2H-1,4-benzodiazepin-2-one in tetrahydrofuran or ethyl acetate in the presence of potassium carbonate under reflux. According to the method of the present invention, high purity oxoquazepam can be manufactured in high yields.