Synthesis of Cyclobutenes and Allenes by Cobalt‐Catalyzed Cross‐Dimerization of Simple Alkenes with 1,3‐Enynes |
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| Authors: | Akira Nishimura Eri Tamai Dr. Masato Ohashi Prof. Dr. Sensuke Ogoshi |
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| Affiliation: | 1. Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565‐0871 (Japan), Fax: (+81)?6‐6879‐7394;2. JST, Advanced Catalytic Transformation Program for Carbon Utilization (ACT‐C), Suita, Osaka 565‐0871 (Japan) |
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| Abstract: | Cobalt‐catalyzed cross‐dimerization of simple alkenes with 1,3‐enynes is reported. A [2+2] cycloaddition reaction occurred, with alkenes bearing no allylic hydrogen, by reductive elimination of a η3‐butadienyl cobaltacycle. On the other hand, aliphatic alkenes underwent 1,4‐hydroallylation by means of exo‐cyclic β‐H elimination. These reactions can provide cyclobutenes and allenes that were previously difficult to access, from simple substrates in a highly chemo‐ and regioselective manner. |
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| Keywords: | 1,3‐enyenes alkenes allenes cobalt cyclobutene |
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