Synthesis of new bis(2,4‐dimethyl‐5‐amino‐benzo[b][1,8]‐naphthyridines) and bis(benzo[b][1,8]naphthyridones) linked with methylene linear chain

The preparation of novel alkyl monobridged 2,4‐dimethyl‐5‐amino‐benzob]1,8]naphthyiridine and benzob]1,8]naphthyridone derivatives by phase transfer catalysis is reported.