| 摘要 |
PCT No. PCT/FR96/01794 Sec. 371 Date May 15, 1998 Sec. 102(e) Date May 15, 1998 PCT Filed Nov. 14, 1996 PCT Pub. No. WO97/18197 PCT Pub. Date May 22, 1997A subject of the invention is a preparation process for the products of formula (I): in which R1 and R2 represent in particular hydrogen, cyano, halogen or amino,R3 represents in particular hydrogen or hydroxyl alkyl, R4 and R5 represent in particular optionally substituted alkyl, X and y represent oxygen or sulphur, characterized in that a product of formula (A): 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.
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