申请人:Hoechst Celanese Corporation
公开号:US05151540A1
公开(公告)日:1992-09-29
A method is provided for preparing N-acylaminothiophenols, e.g., N-acetyl-para-aminothiophenol, or aminothiophenols, e.g., para-aminothiophenol, or N,S-diacylaminothiophenols, e.g., N,S-diacetyl-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-paraaminothiophenol, or an N-acyl aminothiophenol, e.g., N-acetyl-para-aminothiophenol, respectively. The S-(N-acyl-aminoaryl) N,N-di(organo)thiocarbamate may be hydrolyzed to the N-acyl aminothiophenol 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-dimethylthiocarbamoyl 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.
提供了一种制备N-酰氨基噻吩的方法,例如N-乙酰基对氨基噻吩,或氨基噻吩,例如对氨基噻吩,或N,S-二酰氨基噻吩,例如N,S-二乙酰基对氨基噻吩的方法,通过将某些含硫酮之一与羟肟或羟肟盐反应,形成酮的肟,将肟在催化剂存在下经过贝克曼重排反应,形成S-(N-酰氨基芳基) N,N-二(有机)硫代氨基甲酸酯,例如S-(N-乙酰基对氨基苯基) N,N-二甲基硫代氨基甲酸酯,N,S-二酰氨基噻吩,例如N,S-二乙酰基对氨基噻吩,或N-酰氨基噻吩,例如N-乙酰基对氨基噻吩,分别。S-(N-酰氨基芳基) N,N-二(有机)硫代氨基甲酸酯可以水解为N-酰氨基噻吩或氨基噻吩。S-(酰芳基) N,N-二(有机)硫代氨基甲酸酯可以通过将羟基芳香酮,例如4-羟基乙酰苯酮(4-HAP)与N,N-二(有机)硫代氨基甲酸酰卤,例如N,N-二甲基硫代氨基甲酸酰氯(DMTC)反应形成O-(酰芳基) N,N-二(有机)硫代氨基甲酸酯,例如O-(4'-乙酰基苯基) N,N-二甲基硫代氨基甲酸酯,并热解重排后制备。酰基噻吩可以通过水解S-(酰芳基) N,N-二(有机)硫代氨基甲酸酯制备。