1: 95 percent / O2 / chiral V2O9C26H28N2 / CCl4 / 0 °C 2: NaH / tetrahydrofuran / 5 h / 0 - 20 °C 3: 3.8 g / K2CO3; Pd(PPh3)4 / methanol / 5 h / Heating 4: 87 percent / Et3N / CH2Cl2 / 2 h / 0 - 20 °C 5: Pd(PPh3)4; HCO2H; i-Pr2NEt / dimethylformamide / 80 °C 6: aq. HCl / CHCl3; ethanol / 2 h / 65 °C View Scheme

T=90°C; 2 h;