in N,N-dimethyl-formamide 1 h; Heating;

1: 56 percent / Na2CO3 / acetone / 2 h / Ambient temperature 2: 85 percent / dimethylformamide / 1 h / Heating View Scheme

4-(N,N-dimethlyamino)pyridine; aluminium trichloride; Wang resin; diisopropyl-carbodiimide 1.) DMF, 18 h, 2.) DMF, 18 h, 3.) CH2Cl2, RT, 18 h; Yield given. Multistep reaction;