1.1: Li2NiBr4 / tetrahydrofuran / 0 - 4 °C 1.2: 75 percent / AgNO3 / dimethylformamide / 9 h / 70 °C 2.1: 83 percent / CH2Cl2 / 2 h / 0 °C 3.1: isoamyl nitrite; Et3N / tetrahydrofuran / 1.5 h / Heating 3.2: hydrogen / Pd black / acetic acid / 20 °C / 760 Torr 3.3: K2CO3 / methanol / Heating View Scheme