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:
Dec. 27, 2016
Filed:
Sep. 26, 2013
Applicant:
Api Corporation, Tokyo, JP;
Inventor:
Masahiko Seki, Tokyo, JP;
Assignee:
API Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 257/04 (2006.01); C07D 403/10 (2006.01); C07D 405/14 (2006.01); B01J 23/58 (2006.01);
U.S. Cl.
CPC ...
C07D 257/04 (2013.01); B01J 23/58 (2013.01); C07D 403/10 (2013.01); C07D 405/14 (2013.01);
Abstract
The present invention relates to a method of deprotecting a tetrazole compound, useful as an intermediate for angiotensin II receptor blockers, and provides a novel production method of angiotensin II receptor blockers. Provided is a production method of a compound represented by the formula [3] or [4] or a salt thereof, including (i) reducing a compound represented by the formula [1] or [2] or a salt thereof in the presence of a metal catalyst and an alkaline earth metal salt, or (ii) reacting the compound with a particular amount of Brønsted acid: wherein each symbol is as defined in the present specification.