Opening of the pyridine ring of compounds of the hydroxyquinoline series
The nitrosation of 2-, 3-, and 4-hydroxyindoles was investigated. The Beckmann rearrangement with opening of the pyridine ring to form anthranilic acids or their derivatives occurs during the action of benzenesulfonyl chloride in alkaline media on 3-nitroso-4-hydroxycarbostyrils.