1: 98 percent / pyridine / 1 h / 0 °C 2: 84 percent / LDA / 1.) -78 deg C, 30 min, 2.) RT, 30 min 4: 5percent sodium amalgam / tetrahydrofuran; methanol / 9 h / -20 - 20 °C 5: n-Bu4NF / tetrahydrofuran / 2 h / Ambient temperature View Scheme