1: 94 percent / aq. 6N HCl / 14 h / Heating 2: 100 percent / CH3COCl / 12 h / 60 °C 3: 85 percent / DIEA / acetonitrile / 24 h / 50 °C 4: 91 percent / (COCl)2; DMSO / CH2Cl2 / 0.33 h / -78 °C 5: 83 percent / aq. LiOH / methanol / 12 h / 70 °C 6: (COCl)2 7: Et3N; N-methyl-2-chloropyridinium iodide / CH2Cl2 / 12 h / Heating 8: Bu3SnH / CH2Cl2 / 2 h / Irradiation View Scheme