1.1: 74 percent / H2 / 10 percent Pd/C / methanol / 0.07 h 2.1: oxalyl chloride; DMSO; DIPEA / CH2Cl2 / -78 - 20 °C 3.1: aq. HCl / CH2Cl2 / 0.5 h 4.1: LDA / tetrahydrofuran; hexane / 15 h / -78 °C 4.2: 77 percent / tetrahydrofuran; hexane / -78 - 20 °C View Scheme