Regioselective, Catalyst-Free, One-Step Synthesis of ABCD-Fused Heterocyclic Ring System, Closely Related to Circumdatin Alkaloids

[摘要]：A novel method for the synthesis of tetracyclic fusedring heterocycles, closely related to circumdatin alkaloids, is developed via regioselective reaction of heterocyclic ketene aminals (HKA) with 3-formylchromones.

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