| abstract |
The invention provides a process for preparing a compound of formula (I) and pharmaceutically acceptable derivatives thereof in which: R0 is halogen, C¿1-6?alkyl, C1-6alkoxy, C1-6alkoxy substituted by one or more fluorine atoms, or O(CH2)nNR?4R5; R1 and R2¿ are independently selected from H, C¿1-6?alkyl, C1-6alkyl substituted by one or more fluorine atoms, C1-6alkoxy, C1-6hydroxyalkyl, SC1-6alkyl, C(O)H, C(O)C1-6alkyl, C1-6alkylsulphonyl, C1-6alkoxy substituted by one or more fluorine atoms, O(CH2)nCO2C1-6alkyl, O(CH2nSC1-6alkyl, (CH2)nNR?4R5, (CH¿2)nSC1-6alkyl or C(O)NR4R5; with the proviso that when R0 is at the 4-position and is halogen, at least one of R?1 and R2¿ is C¿1-6?alkylsulphonyl, C1-6alkoxy substituted by one or more fluorine atoms, O(CH2)nCO2C1-6alkyl, O(CH2)nSC1-6alkyl, (CH2)nNR?4R5¿ or (CH¿2?)nSC1-6alkyl, C(O)NR?4R5; R3¿ is C¿1-6?alkyl or NH2; R?4 and R5¿ are independently selected from H, or C¿1-6?alkyl or, together with the nitrogen atom to which they are attached, form a 4-8 membered saturated ring; and n is 1-4;which comprises oxidising a corresponding compound of formula (II) or an isomer thereof. |