Apart from benzofuran-derived oxadienes, the benzofuran-derived azadienes are also evaluated. With the simple adjustment of feeding method and substrate equivalent, target product 6a could be obtained in excellent yield (99%) under the optimized conditions, indicating the benzofuran-derived azadienes exhibit higher reactivities in comparison with the benzofuran-derived oxadienes 2 (details were shown in Supporting Information). The structure of 5a was determined by X-ray crystallography (see Supporting Information). Subsequently, the generality of this reaction was investigated by looking at various benzofuran-derived azadienes (Table ). A wide range of monosubstituents on the benzofuran-derived azadienes 5 were well-tolerated in the reaction and 6b-6f, 6i-6j bearing various substituents (o-Cl, m-OMe, m-Br, p-OMe, p-F, 5-Me, 5-Cl) were isolated in high to excellent yields (83%-99%). The reaction has also demonstrated compatibility with substrate uniting 2-thiophene moiety, which furnished the desired product with acceptable result (6g, 67% yield). Moreover, when β-naphthyl benzofuran-derived azadiene 5h was utilized, the reaction furnished product 6h in high yield (90 %). It is noteworthy that furan-derived azadiene 5k was also effciently proceeded to afford the target product 6k in 84% yield. In addition, acyclic oxadiene afforded ideal product in 9% yield. Encouragely, monocyclic oxadiene without dearomatization driving force was investigated, but no target product was observed. Moreover, several other α,β-unsaturated compounds were tested in our protocol and failed to furnish more spiro-BCHs (details were shown in Supporting Information).