B(C6F5)3-catalyzed metal-free hydrogenation of 3,6-diarylpyridazines

This paper describes the first metal-free hydrogenation of 3,6-diarylpyridazines, which was successfully realized using B(C6F5)3 as a catalyst. A variety of 1,4,5,6-tetrahydropyridazine derivatives were furnished in 85-95% yields.