Fused s ‐triazino heterocycles. XVIII. 1,3,4,7,11c‐Pentaazabenz[ de ]anthracene and 1,3,4,6,7,11c‐hexaazabenz[ de ]anthracene. Two new ring systems

The reaction of 2‐amino‐4‐chloro‐6‐methylpyrimidine ( 3a ) with trimethylacetyl chloride gave 4‐chloro‐6‐methyl‐2‐trimethylacetamidopyrimidine ( 5 ). This latter compound with excess anthranilonitrile gave in one step 2‐ t ‐butyl‐5‐methyl‐1,3,4,7,11c‐pentaazabenz[ de ]anthracene ( 6a ). To prepare 2‐ t ‐butyl‐5‐dimethylamino‐1,3,4,6,7,11c‐hexaazabenz[ de ]anthracene ( 6b ) it was found necessary to first react 2‐amino‐4‐chloro‐6‐dimethylamino ‐5 ‐triazine ( 3b ) with anthranilonitrile to yield the intermediate product 2‐amino‐4(2‐cyanoanilino)‐6‐dimethylamino‐ s ‐triazine ( 4 ). Reaction of the latter with trimethylacetyl chloride gave 6b .