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(20S)‐Camptothecin, irinotecan and SN‐38 were successfully synthesized by a photocatalyzed radical cascade cyclization from an N‐propargyl iodopyridinone and an arylisonitrile under visible light with a ruthenium catalyst. This synthetic method provided a useful entry into composing camptothecin family of antitumor agents in good yields under mild reaction conditions without the use of heavy metal...
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