2008

Polyphenyl derivativesQ 0700 Regioselective Synthesis of Fluorinated Phenols, Biaryls, 6H-Benzo[c]chromen-

-6-ones and Fluorenones Based on Formal [3 + 3] Cyclizations of 1,3-Bis(silyl enol ethers). — Several 2-fluoro-3-(silyloxy)-2-en-1-ones undergo with the title silyl enol ethers a TiCl4-mediated cyclization to give 4-fluorophenols in a highly regioselective manner (35 examples). Phenols (III) and (VI) are converted into dibenzopyrans (IV) and fluorenes (VII), correspondingly. — (HUSSAIN, I.; YAWER, M. A.; LAU, M.; PUNDT, T.; FISCHER, C.; GOERLS, H.; LANGER*, P.; Eur. J. Org. Chem. 2008, 3, 503-518; Inst. Chem., Univ. Rostock, D-18059 Rostock, Germany; Eng.) — Klein

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2008