申请人:Toms River Chemical Corporation
公开号:US04283556A1
公开(公告)日:1981-08-11
A process for the manufacture of a substantially isomerically pure acylanilide of the structure ##STR1## where R is hydrogen, lower alkyl, hydroxy-lower alkyl or lower alkoxy-lower alkyl; R.sub.1 is lower alkyl, phenyl, lower alkylphenyl, lower alkoxy, lower alkoxyphenyl, chlorophenyl, nitrophenyl, dichlorophenyl, chloro-lower alkyl, cyano-lower alkyl, lower alkyl amino, sulfamoylphenyl, carbamoylphenyl or lower alkoxy-lower alkyl; and X is --CO-- or --SO.sub.2 --; comprising the step of treating an alcohol solution of a diamino compound of the structure ##STR2## with an acylating agent, to give an alcohol solution of the acylanilide, wherein substantially equivalent amounts of the acylating agent and the diamino compound are used and wherein the treatment is carried out by the slow, drop-wise addition of the acylating agent at a temperature in the range of about 0.degree. to 5.degree. C. The process is particularly advantageous when the alcohol solution of the diamino compound is produced by reduction of a suspension of the corresponding dinitro compound in the alcohol.
一种制备基本同分异构纯度的苯乙酰苯胺的过程,结构式为##STR1##其中,R为氢、低烷基、羟基-低烷基或低烷氧基-低烷基;R.sub.1为低烷基、苯基、低烷基苯基、低烷氧基、低烷氧基苯基、氯苯基、硝基苯基、二氯苯基、氯-低烷基、氰基-低烷基、低烷基氨基、磺酰氨基苯基、氨基甲酰苯基或低烷氧基-低烷基;X为--CO--或--SO.sub.2--;包括以下步骤:用酰化剂处理结构式为##STR2##的二氨基化合物的醇溶液,以得到醇溶液的苯乙酰苯胺,其中使用相当数量的酰化剂和二氨基化合物,并且处理是通过缓慢滴加酰化剂,在约0℃至5℃的温度范围内进行的。当所述二氨基化合物的醇溶液是通过还原相应的二硝基化合物在醇中的悬浮液而产生时,该过程特别有优势。