申请人:ICI Americas Inc.
公开号:US04877880A1
公开(公告)日:1989-10-31
A process for the preparation of certain iminothiazolidines of the formula ##STR1## in which R is halo, nitro, cyano, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, pentahalomethyl, difluoromethyl, pentafluoroethyl, trifluoromethylthio, difluoromethoxy, trifluoromethoxy, tetrafluoroethoxy, methylsulfonyl, C.sub.1 -C.sub.4 alkyloxyiminomethyl, benzyloxyiminomethyl, 1-(C.sub.1 -C.sub.4)alkyl oxyiminoethyl or 1-benzyloxyiminoethyl; R.sub.1 is hydrogen or halo; R.sub.2 is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 haloalkyl; and R.sub.3 and R.sub.4 are independently hydrogen, halo, nitro, cyano, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 fluoroalkoxy or C.sub.1 -C.sub.4 alkylthio, by reacting a thiourea with methanesulfonic acid or trifluoromethanesulfonic acid in an aprotic solvent for a period of time and at a temperature sufficient to achieve cyclization of the thiourea to form said iminothiazolidine. The thiourea may be prepared by reaction of an N-3-substituted allyl aniline with an arylisothiocyanate.
一种制备特定亚硫代咪唑啉的方法,其化学式为##STR1##其中R为卤素、硝基、氰基、C.sub.1 -C.sub.4烷基、C.sub.1 -C.sub.4烷氧基、五卤代甲基、二氟甲基、五氟乙基、三氟甲硫基、二氟甲氧基、三氟甲氧基、四氟乙氧基、甲磺酰基、C.sub.1 -C.sub.4烷氧基亚胺甲基、苄氧基亚胺甲基、1-(C.sub.1 -C.sub.4)烷氧基亚氨基乙基或1-苄氧基亚氨基乙基;R.sub.1为氢或卤素;R.sub.2为氢、C.sub.1 -C.sub.4烷基或C.sub.1 -C.sub.4卤代烷基;R.sub.3和R.sub.4独立地为氢、卤素、硝基、氰基、C.sub.1 -C.sub.4烷基、C.sub.1 -C.sub.4卤代烷基、C.sub.1 -C.sub.4烷氧基、C.sub.1 -C.sub.4氟烷氧基或C.sub.1 -C.sub.4烷硫基。通过在无极性溶剂中,将硫脲与甲烷磺酸或三氟甲磺酸反应一段时间,并在足够温度下使硫脲发生环化反应形成所述亚硫代咪唑啉。硫脲可以通过N-3-取代烯丙基苯胺与芳基异硫氰酸酯反应制备。