申请人:Clariant GmbH
公开号:US06001831A1
公开(公告)日:1999-12-14
A process for producing 1,2,3,4-tetrahydro-2,4-dioxo-quinazoline-1-yl acetic acid derivatives of the formula (I) in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are mutually independently hydrogen, halogen, OH, NO.sub.2, (C.sub.1 -C.sub.6) alkoxy, (C.sub.1 -C.sub.6) alkyl, halogen-substituted (C.sub.1 -C.sub.6) alkyl, R.sup.5 is hydrogen, (C.sub.1 -C.sub.6) alkyl, phenyl where the alkyl or phenyl radical may also be substituted by halogen atoms; in which an anthranilic acid derivative of formula (II), in which R.sup.1 to R.sup.5 have the above meaning and R.sup.6 is hydrogen, (C.sub.1 -C.sub.6) alkyl or phenyl, where the alkyl or phenyl radical may also be substituted by halogen atoms, is reacted with a metal cyanate and hydrogen chloride in the presence of an inert solvent. ##STR1##
一种制备式(I)的1,2,3,4-四氢-2,4-二氧基喹唑啉-1-乙酸衍生物的方法,其中R.sup.1、R.sup.2、R.sup.3和R.sup.4相互独立地为氢、卤素、羟基、NO.sub.2、(C.sub.1-C.sub.6)烷氧基、(C.sub.1-C.sub.6)烷基、卤素取代的(C.sub.1-C.sub.6)烷基,R.sup.5为氢、(C.sub.1-C.sub.6)烷基、苯基,其中烷基或苯基基团也可以被卤素原子取代;在惰性溶剂的存在下,式(II)的蒽酰氨衍生物与金属氰酸盐和氯化氢反应,其中R.sup.1到R.sup.5具有上述含义,R.sup.6为氢、(C.sub.1-C.sub.6)烷基或苯基,其中烷基或苯基基团也可以被卤素原子取代。