1: cyclopropyl bromide With magnesium in tetrahydrofuran T=20°C; 0.5 h; Microwave irradiation; 2: 2-pyridine carbonitrile in tetrahydrofuran T=100°C; 0.166667 h; Microwave irradiation; 3: With methanol; sodium tetrahydroborate in tetrahydrofuran T=20°C;