1: D-iso-Gln-γ-OBn trifluoroacetate With triethylamine in N,N-dimethyl-formamide T=20°C; 15 h; 2: 4-nitrophenyl N-Boc-L-alanine ester in N,N-dimethyl-formamide T=20°C; 19 h;

triethylamine in acetonitrile 15 h; Ambient temperature; Yield given;