2-Iodo-2-cyclohexen-1-ones 10 react under mild conditions with a large excess (4 equiv.) of an activated Zn(Ag) couple in the presence of TMEDA (1 equiv.) leading to the corresponding 3-oxo-2-cyclohexen-2-ylzinc iodides 11 in good yields. These new organozinc reagents can also be prepared in high yields by reaction of 10 and TMEDA (1 equiv.) with a large excess (4 equiv.) of 98% pure zinc dust (< 10 micron), which must be activated with chlorotrimethylsilane. In the presence of a palladium(0) catalyst precursor, compounds 11 undergo cross-coupling reactions with aryl or alkenyl halides bearing a variety of functional groups to give in moderate to high yields the desired 2-substituted 2-cyclohexen-1-ones 12. (C) 1997 Elsevier Science S.A.
|Autori:||Rossi, Renzo; Bellina, Fabio; Ciucci, D.|
|Titolo:||Preparation of 3-oxo-2-cyclohexen-2-ylzinc iodides and their palladium-mediated reactions with aryl or alkenyl halides|
|Anno del prodotto:||1997|
|Digital Object Identifier (DOI):||10.1016/S0022-328X(97)00294-5|
|Appare nelle tipologie:||1.1 Articolo in rivista|