A new process for the production of 3,4-dialkoxyanilines in which the two alkyl groups are different from each other is disclosed. The process comprises the stepwise introduction of the alkyl groups in different stages of the process by converting pyrocatechol into its monoalkyl ether, coupling said monoalkyl ether with a phenyldiazonium salt, alkylating the 3-alkoxy-4-hydroxy-azobenzene obtained to form 3,4-dialkoxyazobenzene and reductively cleaving the latter to the corresponding 3,4-dialkoxyaniline. The 3,4-dialkoxyanilines obtainable by the new process are valuable intermediates for the preparation of 4-hydroxy-6,7-dialkoxy-3-quinoline carboxylic acid esters which are excellent coccidiostats.
揭示了一种用于生产3,4-二烷氧基
苯胺的新工艺,其中两个烷基基团彼此不同。该工艺包括通过将
间苯二酚转化为其单烷基醚,将该单烷基醚与苯基重氮盐偶联,烷基化所得的3-烷氧基-
4-羟基偶氮苯形成3,4-二烷氧基
偶氮苯,并还原裂解后者形成相应的3,4-二烷氧基
苯胺的分步引入烷基基团的步骤。通过这种新工艺获得的3,4-二烷氧基
苯胺是制备
4-羟基-6,7-二烷氧基-
3-喹啉羧酸酯的宝贵中间体,后者是优秀的球虫防治剂。