| Abstract
| - 2-Iodo-4-(phenylchalcogenyl)-1-butenes 2 or 3, which are derived from the ring-opening reaction ofmethylenecyclopropanes (MCPs) 1 by iodine, can be applied to some palladium-catalyzed cross-coupling reactions such as the Sonogashira, Heck, Kumada, Suzuki, and Negishi reactions undermild conditions to give the corresponding coupling products in good yields. These reactions proceededsmoothly at room temperature (20 °C) in most cases without any phosphine ligand and additive.The phenylchalcogenyl group plays an important role in the reactions and a plausible reactionmechanism has been proposed.
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