1: 2-(4-fluorophenyl)-5-[(1-methylethyl)oxy]-6-[(methylsulfonyl)amino]-1-benzofuran-3-carboxylic acid With N-ethyl-N,N-diisopropylamine; HATU in N,N-dimethyl-formamide T=21°C; 0.166667 h; 2: methylamine in tetrahydrofuran; N,N-dimethyl-formamide T=21°C; 18 h;