n,n,n'-triethylethylenediamine in acetonitrile 10 h; Yield given;

in tetrahydrofuran Heating;

1: 1) s-BuLi / 1) THF, cyclohexane, -40 to -20 deg C, 2) -40 deg C, 1 min 2: 1) 10percent HCl, 2) 10percent HCl / 1) EtOH, reflux, 15 min, 2) toluene, EtOH, reflux, 3 h View Scheme

1: 1) tert-butyllithium / N,N,N',N'-tetramethylethylenediamine, 2) DMF / 1) THF, -40 to -20 deg C, 2) -40 deg C, 5 min 2: 12N HCl / tetrahydrofuran / Ambient temperature View Scheme