1: 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoic acid With O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine in N,N-dimethyl-formamide T=20°C; 0.75 h; 2: ethanolamine in N,N-dimethyl-formamide 25 h;