申请人:Bayer Aktiengesellschaft
公开号:US04461911A1
公开(公告)日:1984-07-24
Process for the preparation of S-arylthioglycolic acids of the formula ##STR1## in which A designates a benzene ring, which can be substituted by 1, 2, 3, 4 or 5 substituents from the series halogen, nitro, hydroxyl, mercapto, trifluoromethyl, alkyl, aryl, alkoxy, aryloxy, acylamino, alkylamino, arylamino, alkylmercapto, arylmercapto, cyano, carboxyl, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aryloxycarbonyl or optionally substituted aminocarbonyl, or represents a benzene ring, which optionally carries 1 or 2 of the previously mentioned substituents, to which a carbocyclic or heterocyclic aromatic ring is attached, characterized in that aryldiazonium salts of the formula ##STR2## in which A has the meanings given for the formula (I) and X designates the radical of an acid capable of forming a salt with the diazonium cation, are reacted with thioglycolic acid in an aqueous acid medium in the presence of Cu(I) or Cu(II) salts and the reaction mixture is worked up to compounds of the formula (I) or their salts.
制备公式为##STR1##的S-芳基硫代乙酸的工艺,其中A代表苯环,可被1、2、3、4或5个来自系列卤素、硝基、羟基、巯基、三氟甲基、烷基、芳基、烷氧基、芳氧基、酰胺基、烷基胺基、芳基胺基、烷硫基、芳硫基、氰基、羧基、烷基羰基、芳基羰基、烷氧羰基、芳氧羰基或可选取代氨基羰基的取代基所取代,或代表一个苯环,可选取1或2个先前提到的取代基,其中连接一个环烷基或杂环芳香环,其特征在于芳基重氮盐的公式为##STR2##在水酸性介质中,在Cu(I)或Cu(II)盐的存在下,与巯基乙酸反应,并处理反应混合物以形成公式(I)或其盐的化合物。