Tropone hydrazides in [10+2]‐hetero‐higher‐order cycloaddition for the synthesis of tetrahydropyridazine derivatives

[10+2]‐Hetero‐higher‐order cycloaddition between tropone hydrazides (acting as 10π‐components) and 3‐alkylidene oxindoles (acting as 2π‐components) has been established. Under Brønsted base catalysis the reaction proceeded in a fully peri‐ and diastereoselective manner with the stereochemical outcome governed mainly by electronic interactions. Following such a strategy, a series of structurally diverse tetrahydropyridazines were prepared in 30‐70% yields. Furthermore, the potential of the obtained cycloadducts has been confirmed in selected chemoselective transformations.