申请人:Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
公开号:US04175188A1
公开(公告)日:1979-11-20
1,2,4-triazin-5-one compounds of the general formula (I) ##STR1## where R is ##STR2## are prepared by reacting a compound of general formula (II) ##STR3## in which R is defined above with either (a) a tertiary alcohol of general formula (III) HO--R' (III) in which R' is a t-alkyl group having 4 to 18 carbon atoms, especially t-amyl or t-octyl or preferably t-butyl or (b) an alkene of general formula (IV) ##STR4## in which R.sub.1 and R.sub.2 are the same or different and are hydrogen or an alkyl group and R.sub.3 and R.sub.4 are the same or different and wherein the alkyl groups in each case can be 1 to 15 carbon atoms and wherein preferably R.sub.1 and R.sub.2 are hydrogen and R.sub.3 and R.sub.4 each are methyl to form an .alpha.-ketocarboxylic acid amide of general formula (V) ##STR5## and this, in a given case after previous saponification to the free acid, condensed with thiocarbohydrazide ##STR6## to form a 1,2,4-triazin-5-one compound of general formula (VI) ##STR7## and then the mercapto group is methylated.
通式(I)中的1,2,4-三嗪-5-酮化合物##STR1##,其中R为##STR2##,通过将通式(II)中的化合物##STR3##(其中R如上所定义)与(a)通式(III)HO--R'(III),其中R'为具有4至18个碳原子的t-烷基基团,尤其是t-戊基或t-辛基或更好地是t-丁基,或者(b)通式(IV)中的烯烃进行反应制备##STR4##,其中R.sub.1和R.sub.2相同或不同且为氢或烷基基团,R.sub.3和R.sub.4相同或不同,其中在每种情况下烷基基团可为1至15个碳原子,最好是R.sub.1和R.sub.2为氢,R.sub.3和R.sub.4各为甲基,形成通式(V)的α-酮羧酸酰胺##STR5##,然后,在给定情况下,经过预先皂化为游离酸后,与硫代碳酰肼##STR6##缩合形成通式(VI)的1,2,4-三嗪-5-酮化合物##STR7##,然后对巯基进行甲基化。