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A 4‐(dimethylamino)pyridine‐catalyzed (3+2) annulation of pyrazoledione‐derived Morita–Baylis–Hillman (MBH) carbonates with 2‐arylideneindane‐1,3‐diones has been developed to afford various multifunctional spiropyrazole derivatives in 16–99% yields with 3:2–>20:1 diastereoselectivities. As a type of Lewis‐base receptor, the pyrazoledione‐derived MBH carbonates will function as a key substrate in...
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