Preparation of ortho-(alkylthiomethyl) anilines by catalytic sulfilimine rearrangement
申请人:Monsanto Company
公开号:EP0143768A1
公开(公告)日:1985-06-05
This invention relates to a process for preparing ortho-(alkylthiomethyl)anilines, e.g. 2-(methylthiomethyl)-6-(trifluoromethyl)aniline of the formula
by catalytic rearrangement of aromatic sulfimides, e.g. N-(2-trifluoromethylphenyl)-S,S-dimethylsulfimide of the formula
in an inert organic solvent. The sulfimides can be prepared. using any of the procedures available in the art. This invention particularly relates to a new class of sulfimides rearrangement catalysts. These catalysts are selected from the group consisting of:
and
wherein R, can be a hydrogen, a lower alkyl or an - NH - alkyl and R2 can be a hydrogen, a lower alkyl, aryl or a
provided that R, and R2 are not both hydrogens, or R, and R2 can be joined to form a cyclic compound having up to a 7- member ring, and R3 and R4 can be a hydrogen, or a lower alkyl; provided that R3 and R4 are not both hydrogens, or R3 and R4 can be joined to form a cyclic compound having up to a 7-member ring, especially from the group consisting of succinimide, imidazole, glutarimide, phthalimide, 2-pyrrolidone, 2-imidazolidone and cyanuric acid.
本发明涉及一种制备正(烷硫基甲基)苯胺,如式 2-(甲硫基甲基)-6-(三氟甲基)苯胺的工艺。
在惰性有机溶剂中催化芳香族亚硫酰亚胺(如式中的 N-(2-三氟甲基苯基)-S,S-二甲基亚硫酰亚胺)的重排。
在惰性有机溶剂中进行。亚硫酰亚胺的制备可采用本领域现有的任何程序。本发明特别涉及一类新的亚硫酰亚胺重排催化剂。这些催化剂选自以下组成的组:
和
其中R可以是氢、低级烷基或-NH-烷基,R2可以是氢、低级烷基、芳基或-NH-烷基。
R3和R4可以是氢、或低级烷基;但R3和R4不能都是氢,或者R3和R4可以连接成具有最多7个成员环的环状化合物,特别是从琥珀酰亚胺、咪唑、戊二酰亚胺、邻苯二甲酰亚胺、2-吡咯烷酮、2-咪唑烷酮和三聚氰酸组成的组中选择。