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Heterocyclic ketene aminals (HKAs) have proven to be a class of fascinating and versatile synthetic building blocks for use in the construction of heterocyclic or fused heterocyclic compounds. The bicyclic, tricyclic, and tetracyclic nitrogen‐containing analogues with HKA skeleton widely exist in natural and synthetic drugs. To understand and to master the reaction properties of HKAs and to construct...
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