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:
Nov. 29, 2022
Filed:
Jan. 25, 2021
Applicant:
Sds Biotech K.k., Tokyo, JP;
Inventors:
Assignee:
SDS BIOTECH K.K., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 67/02 (2006.01); C07C 67/52 (2006.01); C07C 51/08 (2006.01); C07C 63/26 (2006.01); C07C 69/76 (2006.01); C07C 67/11 (2006.01);
U.S. Cl.
CPC ...
C07C 67/02 (2013.01); C07C 51/08 (2013.01); C07C 63/26 (2013.01); C07C 67/11 (2013.01); C07C 67/52 (2013.01); C07C 69/76 (2013.01);
Abstract
The present invention provides a process for producing a compound represented by formula (I), comprising the steps of (a) reacting a compound represented by formula (II) with dimethyl sulfate in the presence of an alkali carbonate in a aqueous ketone solvent to obtain the compound represented by formula (I) as a crystalline material, and (b) washing the crystalline material with heated water at 30 to 100° C. and then further washing with an organic solvent at 30 to 80° C.