A subject of the invention is a preparation process for the products of formula (I): ##STR1## in which R.sub.1 and R.sub.2 represent in particular hydrogen, cyano, halogen or amino,R.sub.3 represents in particular hydrogen or hydroxyl alkyl, R.sub.4 and R.sub.5 represent in particular optionally substituted alkyl, X and y represent oxygen or sulphur, characterized in that a product of formula (A): ##STR2## is prepared in which W represents a halogen atom or a hydantoin derivative, which is subjected to various reactions in order to obtain the products of formula (I), all their isomers and their salts.
发明的一个主题是一种用于制备式(I)产品的制备过程:##STR1##其中R.sub.1和R.sub.2特指氢、
氰基、卤素或
氨基,R.sub.3特指氢或羟基烷基,R.sub.4和R.sub.5特指可选择取代的烷基,X和y代表氧或
硫,其特征在于制备式(A)的产物:##STR2##其中W代表卤素原子或嗪二酮衍
生物,经过各种反应以获得式(I)产品,其所有异构体及其盐。