Synthesis 2013; 45(15): 2179-2187
DOI: 10.1055/s-0033-1338892
paper
© Georg Thieme Verlag Stuttgart · New York

Alkylation and Ring Opening of Perfluoroalkyl- and Perfluoroaryl-Substituted 2-Siloxycyclopropanecarboxylates Yielding Fluorinated γ-Oxo Esters or β,γ-Unsaturated Ketones

Daniel Gladow
Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany   Fax: +49(30)83855367   eMail: hans.reissig@chemie.fu-berlin.de
,
Hans-Ulrich Reissig*
Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany   Fax: +49(30)83855367   eMail: hans.reissig@chemie.fu-berlin.de
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Publikationsverlauf

Received: 10. April 2013

Accepted after revision: 30. April 2013

Publikationsdatum:
17. Juni 2013 (online)


Abstract

Deprotonation of perfluoroalkyl- and perfluorophenyl-substituted methyl 2-siloxycyclopropanecarboxylates and subsequent reaction with alkyl halides furnished C-1 alkylated cyclopropanes with high diastereoselectivities. Smooth triethylamine trishydrofluoride mediated desilylation and ring opening afforded the corresponding γ-oxo esters in good to excellent yields. Treatment of methyl 2-siloxycyclopropanecarboxylates with Grignard reagents and subsequent ring opening in the presence of acid provided β,γ-unsaturated ketones with fluorine-containing substituents.

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