Ceric(IV) ammonium nitrate-mediated oxidative cycloaddition of 1,3-dicarbonyls to vinyl sulfides afforded substituted dihydrofurans with sulfide groups in moderate yields. This new synthetic method has been applied to the synthesis of benzo[b]naphtho[2,3-d]furan-6,11-dione and furanoflavone natural products such as millettocalyxins C and pongol methyl ether.
The indium(III) chloride catalyzed cyclization of 1,3-diketones (I) provides a rapid route to flavones (II) with substituted benzene rings and is used as key step in the total synthesis of lanceolatin B (V). -(LEE*, Y. R.; KANG, K. Y.; Lett.
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