Alkynyl germatranes as alternative reagents for the preparation of biarylethynes
摘要:
Arylalkynyl germatranes react with aryl chlorides and triflates to give the corresponding biarylethynes in good yield. The reaction proceeds under mild conditions in the presence of a palladium phosphine catalyst and fluoride ions. (C) 2002 Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Cross-Coupling Reactions of Allyl, Phenyl, Alkenyl, and Alkynyl Germatranes with Aryl Iodides
摘要:
The potential of using organogermatranes in palladium-catalyzed cross-coupling with aryl iodides has been investigated. We have found that organogermatranes are less reactive in this analogue of Stille coupling than trialkylorganostannanes; nevertheless activation by fluoride promotes the reaction. The hypervalent germanium species produced from the germatranes provide a more efficient and more easily handled reagent than trialkoxygermanium. analogues.