申请人:HOECHST CELANESE CORPORATION
公开号:EP0269434A1
公开(公告)日:1988-06-01
A method is provided for preparing N-acyl-aminothiophenols, e.g., N-acetyl-para-aminothiophenol, or aminothiophenols, e.g., para-aminothiophenol, by reacting any of certain sulfur-containing ketones, viz., an S-(acylaryl) N,N-di(organo)thiocarbamate, e.g., S-(4'-acetophenyl)-N,N-dimethylthiocarbamate, an acylthiophenol acylate ester, e.g., 4-acetothiophenol acetate, or a free acylthiophenol, e.g., 4-acetothiophenol with hydroxylamine or a hydroxylamine salt, to form the oxime of the ketone, subjecting the oxime to a Beckmann rearrangement in the presence of a catalyst to form an S-(N-acyl-aminoaryl) N,N-di(organo)thiocarbamate, e.g., S-(N-acetyl-para-aminophenyl) N,N-dimethylthiocarbamate, an N,S-diacylaminothiophenol, e.g., N,S-diacetyl-para-aminothiophenol, or an N-acyl aminothiophenol, e.g., N-acetyl-para-amino- thiophenol, respectively. The S-(N-acyl-aminoaryl) N,N-di(organo)thiocarbamate may be hydrolyzed to the N-acyl amino- thiophenol or aminothiophenol. The S-(acylaryl) N,N-di(organo)thiocarbamate may be produced by reacting a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone (4-HAP) with an N,N-di(organo)thiocarbamoyl halide, e.g., N,N-dimethylthiocar- bamoyl chloride (DMTC) to form an O-(acylaryl) N,N-di(organo)thiocarbamate, e.g., O-(4'-acetophenyl) N,N-dimethylthiocarbamate, and pyrolytically rearranging the latter compound. The acylthiophenol may be produced by hydrolyzing the S-(acylaryl) N,N-di(organo)thiocarbamate.
本发明提供了一种制备 N-酰基氨基苯硫酚,例如 N-乙酰基对氨基苯硫酚,或氨基苯硫酚,例如对氨基苯硫酚的方法,该方法通过使某些含硫酮中的任何一种,即 S-(酰基)-N,N-二(有机)硫代氨基甲酸酯,例如 S-(4'-乙酰苯基)-N,N-二甲基硫代氨基甲酸酯反应来制备、S-(酰基)N,N-二(有机)硫代氨基甲酸酯,如 S-(4'-乙酰苯基)-N,N-二甲基硫代氨基甲酸酯,酰基苯硫酚酰基酯,如 4-乙酰苯硫酚乙酸酯,或游离酰基苯硫酚,如 4-乙酰苯硫酚乙酸酯、将 4-乙酰苯硫酚与羟胺或羟胺盐一起形成酮的肟,在催化剂存在下使肟进行贝克曼重排,形成 S-(N-乙酰基-氨基芳基) N,N-二(有机)硫代氨基甲酸酯,例如S-(N-乙酰基-副氨基苯基) N,N-二甲基硫代氨基甲酸酯、N,S-二乙酰基氨基苯硫酚,如 N,S-二乙酰基-副氨基苯硫酚,或 N-酰基氨基苯硫酚,如 N-乙酰基-副氨基苯硫酚。S-(N-酰基-氨基芳基)N,N-二(有机)硫代氨基甲酸酯可水解为 N-酰基氨基苯硫酚或氨基苯硫酚。S-(酰基)N,N-二(有机)硫代氨基甲酸酯可通过羟基芳香酮(如 4-羟基苯乙酮 (4-HAP))与 N,N-二(有机)硫代氨基甲酰卤(如 N,N-二甲基硫代氨基甲酰卤)反应制得、N,N-二甲基硫代氨基甲酰氯(DMTC)形成 O-(酰基)N,N-二(有机)硫代氨基甲酸 酯,如 O-(4'-乙酰苯基)N,N-二甲基硫代氨基甲酸酯,并对后一种化合物进行热解重排。酰基苯硫酚可通过水解 S-(酰基)N,N-二(有机)硫代氨基甲酸酯而制得。