The first three-component reaction of norbornene with two alkynes leading to 1,5-enyne via C−H bond activation of terminal silylacetylene was achieved using a Ni(cod)2/phosphine catalyst. This reaction is applicable for various internal alkynes and norbornene derivatives with high regio- and stereoselectivities.
Hydrophosphination of Propargylic Ethers with Diphenylphosphine in the Presence of LiHMDS,<i>N</i>-Heterocyclic Carbene, and Ti(NMe<sub>2</sub>)<sub>4</sub>
Regio- and stereoselective hydrophosphination of propargylic ethers with diphenylphosphine has been achieved using three-component catalyst, LiN(SiMe3)2/1,3-dimethylimidazol-2-ylidene/Ti(NMe2)4 (10 mol % of each).
Highly Chemoselective Nickel-Catalyzed Three-Component Cross-Trimerization of Three Distinct Alkynes Leading to 1,3-Dien-5-ynes
作者:Kenichi Ogata、Jun Sugasawa、Shin-ichi Fukuzawa
DOI:10.1002/anie.200902099
日期:2009.8.3
Cross‐yned: The first highly chemoselective three‐component cross‐trimerization between a triisopropylsilylacetylene, an ether‐functionalized unsymmetrical internalalkyne, and a symmetrical internalalkyne leading to a 1,3‐dien‐5‐yne was achieved using a [Ni(cod)2]/PPh3 catalyst. This reaction is applicable for various internalalkynes with high regio‐ and stereoselectivities.
Direct Synthesis of Alkynylstannanes: ZnBr<sub>2</sub>Catalyst for the Reaction of Tributyltin Methoxide and Terminal Alkynes
作者:Kensuke Kiyokawa、Nodoka Tachikake、Makoto Yasuda、Akio Baba
DOI:10.1002/anie.201104208
日期:2011.10.24
Metal hopping: Various alkynylstannanes were synthesized by the directreaction of Bu3SnOMe with terminalalkynes at room temperature in the presence of a ZnBr2 catalyst. Rather than acting as a Lewis acid, ZnBr2 was transmetalated with Bu3SnOMe to give Zn(OMe)2, which is key to the catalytic reaction.