Cobalt(I)-catalyzed [6+2] cycloadditions of cyclooctatetra(tri)ene with alkynes |
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| Authors: | Achard Mathieu Mosrin Marc Tenaglia Alphonse Buono Gérard |
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| Institution: | Laboratoire de Synthèse Asymétrique, Université d'Aix-Marseille P. Cézanne, Faculté des Sciences et Techniques de St Jér?me, EGIM, Avenue Escadrille Normandie Niemen, 13397 Marseille Cedex 20, France. |
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| Abstract: | The cobalt-catalyzed 6+2] cycloaddition of cyclooctatetraene 1 with alkynes 3 affords monosubstituted bicyclo4.2.2]deca-2,4,7,9-tetraenes 4 in fair to good yields. Due to the valence tautomerism, 1,3,5-cyclooctatriene 2, in equilibrium with bicyclo4.2.0]octa-2,4-diene A, and alkynes 3 are converted to 10 and 11 according to 6+2] and 4+2] cycloadditions, respectively. |
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