| 摘要 |
<p>The invention relates to a process for the preparation of products having formula (I) wherein R1 and R2 represent particularly hydrogen, cyano, halogen or amino, R3 is particularly hydrogen or hydroxyl alkyl, R4 and R5 are particularly optionally substituted alkyl, X and Y are oxygen or sulfur, characterized in that a product having formula (A) is prepared; in formula (A), W is a halogen atom or a derivative of hydantoin which is subjected to various reactions in order to obtain the products of formula (I), all isomers and salts thereof.</p> |
