W(CO)5-amine catalyzed exo- and endo-selective cyclizations of omega-alkynyl silyl enol ethers: a highly useful method for the construction of polycyclic compounds |
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| Authors: | Kusama Hiroyuki Yamabe Hokuto 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: | reaction: see text] A highly useful method for the construction of polycyclic compounds based on the amine-controlled exo- and endo-selective cyclizations of omega-alkynyl silyl enol ethers catalyzed by W(CO)5L is reported. When bis-alkynyl silyl enol ethers were treated with a catalytic amount of W(CO)6, DABCO, and water under photoirradiation, synthetically useful tricyclic ketones were obtained in good yield. |
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