| 主权项 |
1. A process of oxidizing compound A in to compound B in presence of metal persulphate, organic or inorganic coreductant and optionally with inorganic acid, wherein R1 is hydrogen, hydroxy or substituted or unsubstituted alkyl, aryl, aryloxy, alkoxy, hydroxyalkyl, trifluoromethyl, disubstituted amino, nitro, alkylcarbonylamino, alkylcarbonyloxy, halogen, arylalkyloxy, or substituted silyloxy, and R2 and R3 represent C1-C6 alkyl groups, which may be the same or different and which together contain at least three carbon atoms, or R2 and R3 may form a ring together with the amine nitrogen. |
