tetrakis(triphenylphosphine) palladium(0) in toluene T=65°C; 0.5 h; Title compound not separated from byproducts;

in dichloromethane-d2 T=20°C;

1: Cu(CH3CN)4PF6; (2R,5R)-1{[(2R,5R)-2,5-diphenylpyrrolidin-1-yl]methylene}2,5-diphenylpyrrolidinium tetrafluoroborate; sodium t-butanolate / tetrahydrofuran; ethanol / 24 h / 20 °C / |Sealed tube; |Inert atmosphere 2: methanol; tetrahydrofuran; ethanol; water / 0 - 20 °C / |Inert atmosphere; |Sealed tube 3: Oxonereg; / water / 20 °C View Scheme