How is 4,5,6,7-Tetrahydro-2H-indazole (CAS: 2305-79-5) typically synthesized?

4,5,6,7-Tetrahydro-2H-indazole can be synthesized by the condensation of anhydrous ammonia with indole or by the reduction of indazole. Common methods include the von Braun indazole synthesis using anhydrous ammonia and indole, or catalytic hydrogenation of indazole. These methods yield the compound with good selectivity and moderate to high yields depending on the reaction conditions.