1: imidazole / dimethylformamide 2: 1) lithium diisopropylamide / 1) THF, below -70 deg C, 2) -70 deg C, 1 h 3: aq. AcOH / tetrahydrofuran View Scheme

ammonia in methanol 5 h; Ambient temperature;

chloro-trimethyl-silane; potassium iodide T=25°C; 16 h;