[EN] METHOD FOR PRODUCING AMINOTHIAZOLE DERIVATIVE AND PRODUCTION INTERMEDIATE<br/>[FR] PROCÉDÉ DE PRODUCTION D'UN DERIVÉ D'AMINOTHIAZOLE ET INTERMÉDIAIRE DE PRODUCTION
申请人:ZERIA PHARM CO LTD
公开号:WO2006022252A1
公开(公告)日:2006-03-02
Disclosed is a selective demethylation process of a 2-methoxy group. Specifically disclosed is a method for producing a compound represented by the formula (7) below through the following reactions.
METHOD FOR PRODUCING 2-BROMO-4,5-DIALKOXY BENZOIC ACID
申请人:Nakao Ryu
公开号:US20130253222A1
公开(公告)日:2013-09-26
Provided is a method for effectively producing a 4,5-dialkoxy-2-hydroxybenzoic acid from an inexpensive raw material.
A method for producing a 2-bromo-4,5-dialkoxybenzoic acid represented by the following formula (2): (wherein each of R
1
and R
2
represents a lower alkyl group), the method including causing a 3,4-dialkoxybenzoic acid represented by the following formula (1): (wherein R
1
and R
2
have the same meanings as defined above) to react with bromine in concentrated hydrochloric acid.