| 摘要 |
The invention relates to a novel process for the preparation of triphenodioxazine compounds of general formula (I) in which both X represent hydrogen or halogen atoms and the heterocyclic rings labeled A are fused on in 1,2-, 2,3- or 3,4- and 8,9-, 9,10- or 10,11- position and contain at least one nitrogen atom which is unsubstituted or substituted by alkyl, cycloalkyl or aryl radicals, which is characterized by a cyclisation and an oxidation step conducted in the presence of a base in a polar, aprotic solvent. |
