1-(2-丙炔)哌啶 、 2-碘代甲苯 在
dichloro bis(triphenylphosphino)palladium(II) 、 碘化亚铜水 、 magnesium sulfate 作用下,
以
二乙胺 为溶剂,
反应 5.0h,
以gave 3.98 g of an oil of boiling point 96–98° C./0.08 mm Hg的产率得到1-(3-o-Tolyl-2-propynyl)piperidine
Copper-catalyzed Mannichreactions of terminal alkynes and secondary amines with aqueous formaldehyde can be accelerated by the use of a catalytic amount of an imidazole ligand carrying a long alkyl chain. The alkyl chain shows an efficient steric effect and helps the reaction. This imidazole ligand is efficient for various substrates, including even bulky alkynes.