申请人:Ciba-Geigy Corporation
公开号:US05606057A1
公开(公告)日:1997-02-25
A process for the preparation of 6-alkyl-4-(pyridin-3-yl-methyleneamino)-4,5-dihydro-1,2,4-triazin-3(2H)-on e by the reaction of 4-amino-6-alkyl-3-oxo-2,3,4,5-tetrahydro-1,2,4-triazine with 3-cyanopyridine wherein the reaction is carried out under catalytic hydrogenation conditions in the presence of a Raney-nickel catalyst in an aqueous alcoholic medium, at a temperature between 0.degree. and 70.degree. C., at a pH of between 2 and 7, and in the presence of and a C.sub.1 -C.sub.6 -carboxylic acid or a C.sub.1 -C.sub.6 -carboxylic acid alkali metal salt or both, whereby the hydrogen pressure is between 0.1 and 10 bar.
一种通过4-氨基-6-烷基-3-酮基-2,3,4,5-四氢-1,2,4-三嗪与3-氰基吡啶反应制备6-烷基-4-(吡啶-3-基亚甲氨基)-4,5-二氢-1,2,4-三嗪-3(2H)-酮的方法,其中在水醇介质中,在0度至70度之间的温度下,在pH值为2至7之间,在Raney镍催化剂存在下,在氢气存在下在氢压力为0.1至10巴的条件下进行反应,并且存在C.sub.1-C.sub.6-羧酸或C.sub.1-C.sub.6-羧酸碱金属盐或两者,