Boese, Roland; Harvey, Daniel F.; Malaska, Michael J.; Vollhardt, K. Peter C.:
[2 + 2 + 2]Cycloadditions of Alkynes to Furans and Thiophenes: A Cobalt-Mediated \"Enol Ether Walk\".
1994
In: Journal of the American Chemical Society (J.Am.Chem.Soc.), Jg. 116 (1994), Heft 24, S. 11153 - 11154
Artikel/Aufsatz in Zeitschrift1994Chemie
Titel:
[2 + 2 + 2]Cycloadditions of Alkynes to Furans and Thiophenes: A Cobalt-Mediated \"Enol Ether Walk\".
Autor(in):
Boese, RolandLSF; Harvey, Daniel F.; Malaska, Michael J.; Vollhardt, K. Peter C.
Erscheinungsjahr
1994

Abstract:

h5-Cyclopentadienylcobalt mediates the [2+2+2]cycloaddn. of two alkyne units to the 2,3-double bond in furans and thiophenes to give the corresponding complexed dihydrobenzoheterocycles, in turn capable of undergoing migration of the enol ether moiety along the periphery of the cyclohexadiene ligand. In some instances the cobalt-mediated alkyne addn. occurs by apparent C-H activation of the heterocyclopentadiene, resulting in the generation of butadienylated products.