1: 1-hydroxy-naphthalene-2-carboxylic acid With benzotriazol-1-ol; N-ethyl-N,N-diisopropylamine; diisopropyl-carbodiimide in N,N-dimethyl-formamide T=0°C; 0.5 h; 2: methyl 2-amino-2-methylpropionate hydrochloride With N-ethyl-N,N-diisopropylamine in N,N-dimethyl-formamide T=20°C; 16 h;