申请人:Ciba-Geigy Corporation
公开号:US04656273A1
公开(公告)日:1987-04-07
There is described a novel process for producing sulfonylureas of formula I ##STR1## wherein R.sub.1 is hydrogen or alkyl, R.sub.2 is ##STR2## E is .dbd.N-- or .dbd.CH--, R.sub.3 is alkyl, alkoxy or halogen, R.sub.4 is alkyl, cycloalkyl, alkoxy, halogen, alkoxy-alkyl, halo-alkyl or halo-alkoxy, R.sub.5 is hydrogen or alkyl, T is a substituted phenyl group ##STR3## Y is hydrogen or halogen, X is hydrogen, halogen, alkyl, halo-alkyl, alkenyl, halo-alkenyl, alkynyl, alkoxy, halo-alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, halo-alkylthio, alkylsulfonyloxy, phenylsulfonyloxy, phenylsulfonyloxy mono- or polysubstituted by alkyl, or is di-alkylsulfamoyl, and A is a bridge member which has 3 or 4 atoms and which contains 1 or 2 hetero atoms, selected from the group consisting of oxygen, sulfur and nitrogen, the said process comprising reacting a silfonamide of the formula II T--SO.sub.2 --NH.sub.2 (II), in the presence of a base, with diphenyl carbonate to form a salt of a phenyl carbamate converting this salt into the free phenyl carbamate and reacting this further with an amine. Sulfonylureas are herbicidally effective compounds.
本发明描述了一种生产式I的磺酰脲的新工艺。其中,R.sub.1为氢或烷基,R.sub.2为##STR2## E为.dbd.N--或.dbd.CH--,R.sub.3为烷基、烷氧基或卤素,R.sub.4为烷基、环烷基、烷氧基、卤素、烷氧基烷基、卤代烷基或卤代烷氧基,R.sub.5为氢或烷基,T为取代苯基##STR3## Y为氢或卤素,X为氢、卤素、烷基、卤代烷基、烯基、卤代烯基、炔基、烷氧基、卤代烷氧基、烷硫基、烷基亚砜基、烷基磺酰基、卤代烷硫基、烷基磺酰氧基、苯基磺酰氧基、被烷基单烷基取代或多取代的苯基磺酰氧基,或为二烷基磺酰胺基,A是一个桥接成员,具有3或4个原子,其中包含1或2个杂原子,选自氧、硫和氮的群,所述工艺包括在碱存在下,将式II T--SO.sub.2 --NH.sub.2 (II)的磺酰胺与二苯基碳酸酯反应,形成苯基氨甲酸盐,将该盐转化为游离的苯基氨甲酸酯,并进一步与胺反应。磺酰脲是除草有效化合物。