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[摘要]:A new synthesis of the I-oxygenated 1,3-disubstituted carbazole alkaloids, mukonine (1a) and ciausine (1f) is described. The construction of the carbazole framework is based on an allene-mediated electrocyclic reaction involving the indole 2,3-bond. The 1,3-disubstituted 1-oxygenated carbazoles la and If are derived from the 1,2,3-trisubstittited carbazole. |
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