Synthesis and central nervous system stimulant activity of camphor‐1,2,3‐triazine fused with diphenylcyclopropenone and camphor‐1,2,3‐triazine n‐oxides

Reactions of camphor‐1,2,3‐triazine 1 with diphenylcyclopropenone 2 gave two cycloadducts; 6,9‐methanopyrazolo[1,2‐b][1,2,3]benzotriazinones 3–4. Oxidation of 1 with 3‐chloroperbenzoic acid gave 1‐oxide 5 as the major compound along with a trace of 1,2‐dioxide 6.