Synthesis of enynes and epoxyenynes by coupling: use of a new set of catalysts based on Pd–Ag salts
摘要:
The new couple of catalysts Pd(PPh3)(4) and AgI are very efficient for the coupling of vinyltriflates and terminal alkynes in the presence of a bulky amine in dimethylformamide at room temperature. Enynes and epoxyenynes are obtained in good to excellent yields. As illustrated with several examples, a wide variety of functional groups are well tolerated in the described conditions. Silver acetylides have been proposed as intermediate in this reaction. (C) 1998 Elsevier Science S.A. All rights reserved.