1.1: MeLi / tetrahydrofuran; diethyl ether / 0.5 h / -78 °C 1.2: 89 percent / 4 h / 0 °C 2.1: 86 percent / Na2HPO4; Na-Hg / methanol / 4 h / 0 °C 3.1: 97 percent / TFA / CH2Cl2 / 3 h / 20 °C 4.1: PDC; MS 4A / dimethylformamide / 21 h / 20 °C 5.1: 117 mg / diethyl ether / 1 h / 20 °C 6.1: 26 mg / Li; liquid NH3 / tetrahydrofuran / 0.5 h / -78 °C View Scheme