申请人:Hoechst Aktiengesellschaft
公开号:US04808752A1
公开(公告)日:1989-02-28
A process for the preparation of 2-aminophenyl thioethers of the formula (1) ##STR1## in which R represents an alkylC.sub.1 -C.sub.6 group which can be substituted by hydroxyl, alkoxyC.sub.1 -C.sub.4, carboxyl, --COO-alkyl-C.sub.1 -C.sub.4, alkenylC.sub.2 -C.sub.6 or phenyl groups or by the radical ##STR2## and X and Y are each a hydrogen or halogen atom or an alkylC.sub.1 -C.sub.6, alkoxyC.sub.1 -C.sub.6 or nitro group, wherein the salts of the formula (4) ##STR3## in which X and Y have the stated meanings and Me denotes an alkali metal atom or the equivalent amount of an alkaline earth metal atom, which are obtainable in a known manner by reacting 2-aminobenzothiazoles of the formula (3) ##STR4## in which X and Y have the stated meanings, with an alkali metal or alkaline earth metal hydroxides in an alkali-stable anhydrous or virtually anhydrous solvent are reacted, in the isolated form or, advantageously in suspension in the mixture obtained in the ring-opening step, with an alkylating agent of the formula (2) R-Z (2) in which R has the stated meaning and Z represents a halogen atom, or of the formula (2a) (R'O).sub.2 SO.sub.2 (2 a) in which R' denotes an alkylC.sub.1 -C.sub.4 group, or of the formula (2b) Z--alkyleneC.sub.2 -C.sub.6 Z (2b) in which Z has the stated meaning, or with an alkylene-C.sub.2 -C.sub.3 oxide at 0.degree. to 100.degree. C.
一种制备式(1)的2-氨基苯基硫醚的方法,其中R代表可以被羟基,烷氧基C.sub.1-C.sub.4,羧基,--COO-烷基C.sub.1-C.sub.4,烯丙基C.sub.2-C.sub.6或苯基或基团##STR2##替代的烷基C.sub.1-C.sub.6。X和Y分别是氢或卤素原子或烷基C.sub.1-C.sub.6,烷氧基C.sub.1-C.sub.6或硝基的基团。其中式(4)的盐##STR3##其中X和Y具有上述含义,Me表示碱金属原子或等量的碱土金属原子,可通过已知方法在碱稳定的无水或几乎无水溶剂中,通过将式(3)的2-氨基苯并噻唑反应物##STR4##其中X和Y具有上述含义,与碱金属或碱土金属氢氧化物反应得到,以分离形式或优选地在开环步骤中获得的混合物悬浮液中,与式(2)的烷基化试剂R-Z(2)反应,其中R具有上述含义,Z代表卤素原子,或式(2a)(R'O).sub.2SO.sub.2(2a)中的式,其中R'表示烷基C.sub.1-C.sub.4,或式(2b)中的Z-烷基C.sub.2-C.sub.6-Z(2b),其中Z具有上述含义,或在0℃至100℃下与烷基C.sub.2-C.sub.3氧化物反应。