Synlett 2014; 25(14): 2005-2008
DOI: 10.1055/s-0034-1378394
letter
© Georg Thieme Verlag Stuttgart · New York

Cobalt Porphyrin Catalyzed [3+2] Cycloaddition of Cyclopropanes and Carbonyl Compounds

Takahiro Shiba
a   Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan   Fax: +81(75)3832438   eMail: kurahashi.takuya.2c@kyoto-u.ac.jp   eMail: matsubara.seijiro.2e@kyoto-u.ac.jp
,
Daiki Kuroda
a   Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan   Fax: +81(75)3832438   eMail: kurahashi.takuya.2c@kyoto-u.ac.jp   eMail: matsubara.seijiro.2e@kyoto-u.ac.jp
,
Takuya Kurahashi*
a   Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan   Fax: +81(75)3832438   eMail: kurahashi.takuya.2c@kyoto-u.ac.jp   eMail: matsubara.seijiro.2e@kyoto-u.ac.jp
b   JST, ACT-C, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
,
Seijiro Matsubara*
a   Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan   Fax: +81(75)3832438   eMail: kurahashi.takuya.2c@kyoto-u.ac.jp   eMail: matsubara.seijiro.2e@kyoto-u.ac.jp
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Publikationsverlauf

Received: 19. Mai 2014

Accepted after revision: 09. Juni 2014

Publikationsdatum:
04. August 2014 (online)


Abstract

A cobalt porphyrin efficiently catalyzed the formal [3+2] cycloaddition of alkyl-/aryl-substituted cyclopropanes and carbonyl compounds such as aldehydes and ketones to afford the corresponding substituted tetrahydrofurans. The use of the cobalt porphyrin complex as a Lewis acid to catalyze the reaction via the electrophilic activation of cyclopropanes was demonstrated. The high functional-group tolerance and robustness of the catalyst were also demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition of cyclic ketones and cyclopropanes to afford spiro tetrahydrofurans.

Supporting Information