Intermolecular 1,5-dipolar cycloaddition reaction of tungsten-containing vinylazomethine ylides leading to seven-membered heterocycles |
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| Authors: | Kusama Hiroyuki Suzuki Yasuo Takaya Jun Iwasawa Nobuharu |
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| Institution: | Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan. |
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| Abstract: | STRUCTURE: SEE TEXT] Intermolecular 1,5-dipolar cycloaddition reaction of tungsten-containing vinylazomethine ylide, generated from o-(alk-3-en-1-ynyl)phenylbenzaldimines and tungsten carbonyl complex, with ketene acetals proceeds efficiently to give azepino1,2-a]indole derivatives in good yield. Formation of 5+2] or 3+2] cycloadducts can be controlled by an appropriate choice of dipolarophile. |
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