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The structure previously assigned to the phenanthrene alkaloid thalicthuberine has been confirmed by a total synthesis in which the key step involved the formation of ring C of the aporphine alkaloid (±)‐nantenine by a radical‐initiated cyclisation. Opening of ring B of (±)‐nantenine with methyl chloroformate and subsequent reduction of the N‐carbomethoxy group afforded thalicthuberine. 相似文献
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