Process for the preparation of 2-amino-5-acylamino phenols and starting compounds suitable therefor

摘要

Compounds corresponding to Formula I <IMAGE> wherein R1 denotes an acyl group and X denotes hydrogen, halogen, alkoxy, aroxy, SO3H or a heterocyclic group attached through -O- or -N< are prepared form a compound corresponding to Formula II <IMAGE> wherein X has the meaning already indicated and Q denotes the group required for completing a dicarbonimide ring by reduction of the said compound to the amino compound and acylation into a compound corresponding to Formula III <IMAGE> III wherein X, Q and R1 have the meanings indicated followed by conversion of the compound corresponding to Formula III into a compound corresponding to Formula I by hydrazinolytic or hydrolytic decomposition of the dicarbonimide ring.