1.1: AlCl3 / CH2Cl2 / 3 h / 20 °C 1.2: 94 percent / aq. HCl / methanol / 0.5 h / Heating 2.1: 60 percent / Huenig base / CH2Cl2 / 24 h / 20 °C 3.1: 77 percent / aq. K2CO3; n-Bu3NHSO4 / benzene / 20 h / 20 °C 4.1: NaH / dimethylsulfoxide / 3 h / 20 °C 4.2: aq. oxalic acid / 0 °C 4.3: AcOH; conc. HCl / 1.5 h 5.1: (COCl)2; DIPEA; DMSO / CH2Cl2 / 0.5 h / -78 - 20 °C 6.1: HMPA / tetrahydrofuran / 16 h / -85 - 20 °C View Scheme