1.1: n-BuLi / tetrahydrofuran / 0.5 h / -78 °C 1.2: 79 percent / tetrahydrofuran / 2 h / -78 °C 2.1: 87 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / 1.33 h / -78 - 20 °C 3.1: 96 percent / H2 / Pd(OH)2/C / methanol / 16 h / 3800 Torr View Scheme