Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2003, Issue 23, Pages 4634-4639Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200300432
Keywords
cycloaddition; cobalt; zinc
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Enediynes rac-4 were prepared in seven steps with an overall yield of 31% starting from 4-pentyn-l-ol (5). A cobalt mediated [2+2+2]-cycloaddition of these enediynes and subsequent removal of the metal fragment afforded the decahydrophenanthrenes rac-3/13 in 37-56% yield. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).
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