Volume 54, Issue 28 pp. 8241-8244
Communication

Rhodium-Catalyzed [3+2+2] and [2+2+2] Cycloadditions of Two Alkynes with Cyclopropylideneacetamides

Tomoka Yoshida

Tomoka Yoshida

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)

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Yuki Tajima

Yuki Tajima

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)

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Masayuki Kobayashi

Masayuki Kobayashi

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)

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Koji Masutomi

Koji Masutomi

Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550 (Japan) http://www.apc.titech.ac.jp/∼ktanaka/

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Prof. Dr. Keiichi Noguchi

Prof. Dr. Keiichi Noguchi

Instrumentation Analysis Center, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)

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Prof. Dr. Ken Tanaka

Corresponding Author

Prof. Dr. Ken Tanaka

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)

Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550 (Japan) http://www.apc.titech.ac.jp/∼ktanaka/

Japan Science and Technology Agency (JST), ACT-C, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012 (Japan)

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)Search for more papers by this author
First published: 01 June 2015
Citations: 69

This work was supported partly by a Grant-in-Aid for Scientific Research (No 25105714) from the the Ministry of Education, Culture, Sports, Science and Technology [MEXT (Japan)] and by ACT-C from the Japan Science and Technology Agency ]JST (Japan)]. We thank Takasago International Corporation for the gift of segphos and H8-binap, Umicore for generous support in supplying rhodium complexes, and Dr. Yu Shibata (Tokyo Institute of Technology) for assistance in the preparation of the manuscript.

Graphical Abstract

‘Cat nap’: The cationic RhI/H8-binap complex catalyzes the [3+2+2] cycloaddition of 1,6-diynes with cyclopropylideneacetamides to produce cycloheptadienes. In contrast, the cationic RhI/(S)-binap complex catalyzes the enantioselective [2+2+2] cycloaddition of terminal alkynes, acetylenedicarboxylates, and cyclopropylideneacetamides to produce spiro-cyclohexadienes.

Abstract

It has been established that a cationic rhodium(I)/H8-binap complex catalyzes the [3+2+2] cycloaddition of 1,6-diynes with cyclopropylideneacetamides to produce cycloheptadiene derivatives through cleavage of cyclopropane rings. In contrast, a cationic rhodium(I)/(S)-binap complex catalyzes the enantioselective [2+2+2] cycloaddition of terminal alkynes, acetylenedicarboxylates, and cyclopropylideneacetamides to produce spiro-cyclohexadiene derivatives which retain the cyclopropane rings.

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