1: bis(trichloromethyl) carbonate; methyl 4-[6-(4-aminophenyl)-4-morpholin-4-yl-1H-pyrazolo[3,4-d]pyrimidin-1-yl]piperidine-1-carboxylate With triethylamine in dichloromethane T=20°C; 0.0833333 h; 2: methanol in dichloromethane T=20°C;