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Three types of pyrazole-fused heterobicycles, i.e., 1,5-, 1,7-, and 2,5-dihydropyrano[3,2- c ]pyrazoles, were synthesized from 4-allyloxy-1 H -pyrazoles. A sequence of the Claisen rearrangement of 4-allyloxy-1 H -pyrazoles, ruthenium-hydride-catalyzed double bond migration, O -allylation, and ring-closing metathesis was employed in this study.

Synthesis of Dihydropyrano[3,2-c]pyrazoles via Double Bond Migration and Ring-Closing Metathesis