1: 2-methylpyridine-3-carboxylic acid With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride in acetonitrile T=20°C; 0.75 h; 2: tert-butylamine With N-ethyl-N,N-diisopropylamine in dichloromethane; acetonitrile T=5 - 20°C; 15.75 h;