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:
Sep. 19, 2023
Filed:
Jan. 29, 2020
Sumitomo Chemical Company, Limited, Tokyo, JP;
Takayuki Wakamatsu, Takarazuka, JP;
Miyuki Iguchi, Takarazuka, JP;
Junichi Ishikawa, Takarazuka, JP;
Tohru Inoue, Takarazuka, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Abstract
The present invention provides an effective production method for a pyridone compound. More specifically, the present invention provides a production method comprising: a step of reacting the compound represented by formula (1) (in the formula, Xand Xeach independently represent a halogen atom, Rrepresents a hydrogen atom, an amino group, or a group represented by NHCOR, and Rrepresents a C1-C5 alkyl group) with 4 to 10 times by mass, with respect to the compound represented by formula (1), of the compound represented by formula (2) (in the formula, Rrepresents the same as described previously), in the presence of at least one of a tri(C1-C8 alkyl)amine and an alkali metal acetate, at a temperature of 100° C. or higher to obtain the compound represented by formula (3) (in the formula, X, Xand Rrepresent the same as described previously, Rrepresents a hydrogen atom or an NHCORgroup); and a step of hydrolyzing the compound represented by formula (3), to obtain the pyridone compound represented by formula (4) (in the formula, X, Xand Rrepresent the same as described previously).