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The synthesis of racemic and enantiopure tricyclic and tetracyclic pyrrolopyrimidinones, pyrimidoisoindoles, and spiropyrimidinones, as valuable new chemical entities (NCE), based on a highly controlled continuous‐flow (CF) retro‐Diels–Alder protocol is presented. This approach ensures enhanced safety, and gave the target pyrimidinone derivatives 17–25 in yields higher than those obtained in batch...
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