The invention relates to a method of manufacturing a compound according to formula (I) wherein R is C
1-6
alkylor C
5-10
aryl-C
1-6
alkyl, comprising the steps of: a) reacting isonicotinohydrazide and methyl isothiocyanate, thereby obtaining 2-isoni-cotinoyl-N-methylhydrazinecarbothioamide; b) under alkaline conditions allowing said 2-isonicotinoyl-N-methylhydrazinecar-bothioamide to undergo a ring-forming reaction, thereby obtaining 4-methyl-5-pyridin-4-yl-2,4-dihydro-3H-1,2,4-triazole-3-thione; and c) under alkaline conditions allowing said 4-methyl-5-pyridin-4-yl-2,4-dihydro-3H-1,2,4-triazole-3-thione to react with R—X, wherein R has the same meaning as in formula I and X is selected from the group of Cl, Br and I, thereby obtaining a compound according to formula I; wherein steps a), b) and c) are carried out in an aqueous environment without intermediate isolations.
本发明涉及一种制备公式(I)化合物的方法,其中R是C1-6烷基或C5-10芳基-C1-6烷基,包括以下步骤:a)反应异烟
肟酰
肼和甲基异
硫氰酸酯,从而获得2-异烟酰基-N-甲基
肼基甲
硫氨酸;b)在碱性条件下使所述2-异烟酰基-N-甲基
肼基甲
硫氨酸发生环形反应,从而获得4-甲基-5-
吡啶基-2,4-二氢-3H-
1,2,4-三唑-3-硫酮;c)在碱性条件下,使所述4-甲基-5-
吡啶基-2,4-二氢-3H-
1,2,4-三唑-3-硫酮与R-X反应,其中R与公式I中的含义相同,X选自Cl、Br和I的群组,从而获得公式I的化合物;其中步骤a)、b)和c)在无中间分离的
水环境中进行。