| 摘要 |
The application concerns compounds (I) wherein R1, R2, R3 and R4 are H, halo, (halo)alkyl or (halo)alkoxy, which are prepared from compounds (II) or (III), or directly from compounds (IV) and (V): H2N(CH2)2SH by treatment with a base. Compounds (II) or (III), wherein R1 is chloro, R2, R3 and R4 are H, and X is fluoro, are also claimed. The compounds (I) can be reduced to the corresponding dihydro derivatives, which are useful in the preparation of therapeutical agents. |
