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    • 5. 发明申请
    • METHOD FOR THE PREPARATION OF AMIDINO-UREA DERIVATIVES
    • 制备氨基尿素衍生物的方法
    • WO1988007990A1
    • 1988-10-20
    • PCT/HU1988000017
    • 1988-04-08
    • REANAL FINOMVEGYSZERGYARTÖRÖK, SándorNAGY, BalázsPRIBÉK, FerencBALOGH, Sándor
    • REANAL FINOMVEGYSZERGYAR
    • C07C129/12
    • C07C279/24
    • The invention relates to an improved method for the preparation of an amidino-urea derivative of general formula (I), wherein R , R and R each stand for hydrogen, halogen, lower alkyl, lower alkoxy, trifluoromethyl, nitro or optionally substituted amino, R is hydrogen or lower alkyl, and R is hydrogen or C1-10 alkyl, by reacting a lower alkyl carbamate with an appropriate guanidine derivative. According to the invention the reaction is performed in the presence of a bipolar aprotic solvent. The invention also relates to a method for preparing an adduct of 1-(2,6-dimethylphenyl)-3-(N-methylamidino)-urea and dimethyl sulphoxide, in which 1-(2,6-dimethylphenyl)-3-(N-methylamidino)-urea, prepared optionally directly in the reaction mixture, is reacted with dimethyl sulphoxide. When decomposing this aduct with water, 1-(2,6-dimethylphenyl)-3-(N-methylamidino)-urea is obtained in extremely pure state.
    • 本发明涉及制备通式(I)的脒基 - 脲衍生物的改进方法,其中R 1,R 2和R 3各自代表氢,卤素,低级烷基,低级烷氧基 三氟甲基,硝基或任选取代的氨基,R 4是氢或低级烷基,R 5是氢或C 1-10烷基,通过使氨基甲酸低级烷基酯与适当的胍衍生物反应。 根据本发明,反应在双极性非质子传递溶剂的存在下进行。 本发明还涉及制备1-(2,6-二甲基苯基)-3-(N-甲基脒基) - 脲和二甲基亚砜的加合物的方法,其中1-(2,6-二甲基苯基)-3-( N-甲基脒基) - 脲(任选地直接在反应混合物中制备)与二甲基亚砜反应。 当用水分解该产物时,以非常纯的状态获得1-(2,6-二甲基苯基)-3-(N-甲基脒基) - 脲。