in N,N-dimethyl-formamide T=25°C; 0.5 h;

Multi-step reaction with 2 steps 1: 60 percent / triethylamine / CHCl3 / 0.5 h / Ambient temperature2: 41 percent / pyridinium chlorochromate / CH2Cl2 / 3 h / Ambient temperature  

Multi-step reaction with 2 steps 1: 88 percent / dimethylformamide / 0.5 h / Ambient temperature2: 97 percent / Oxone / H2O; methanol / 1.5 h / Ambient temperature