877997-98-3Relevant articles and documents
arab League tests for the amine and a method for the preparation of its hydrochloride (by machine translation)
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, (2016/10/17)
The invention discloses a arab League tests for the amine method for preparing and its hydrochloride, 2 - [(2-hydroxy -4,5-dimethoxy-benzoyl) amino] - 1,3-thiazole-4-carboxylic acid methyl ester, and N, N-diisopropyl ethylenediamin in the molten state after reaction under N-[ 2 - (diisopropyl amino) ethyl] - 2 - [(2-hydroxy -4,5-dimethoxy-benzoyl) amino] - 1,3-thiazole-4-carboxamide, hydrochloric acid for hydrochloric acid prepared by adding dropwisely added methanol trihydrate arab League takes a test for somebody else the amine, the technical proposal of the present invention reduces the use of toluene, economic and convenient, the reaction is complete, process safety; reduced at the same time the residual toluene in the final product, and impurity 2 - [(2-hydroxy -4,5-dimethoxy-benzoyl) amino] - 4-carboxyl -1, the content of 3-thiazole, the product quality is promoted; and is easy to be refined and purification of the crude product, the reaction yield is high. (by machine translation)
METHOD FOR PRODUCING 2-BROMO-4,5-DIALKOXY BENZOIC ACID
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, (2013/10/07)
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 R1 and R2 represents a lower alkyl group), the method including causing a 3,4-dialkoxybenzoic acid represented by the following formula (1): (wherein R1 and R2 have the same meanings as defined above) to react with bromine in concentrated hydrochloric acid.
METHOD FOR PRODUCING AMINOTHIAZOLE DERIVATIVE AND PRODUCTION INTERMEDIATE
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, (2008/06/13)
Provided is a method for selectively demethylating a 2-methoxy group. Specifically provided is a production method of a compound represented by formula (7) below through the following reactions.
METHOD FOR PRODUCING AMINOTHIAZOLE DERIVATIVE AND PRODUCTION INTERMEDIATE
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Page/Page column 10, (2010/10/20)
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.