1: 75 percent / Pd(PPh3)2Cl2; Et3N; formic acid / dimethylformamide / 1 h / 110 °C 2: 68 percent / potassium permanganate / acetone / 3 h / 20 °C View Scheme

bis-triphenylphosphine-palladium(II) chloride; formic acid; triethylamine in N,N-dimethyl-formamide T=110°C; Reduction; 1 h;