1: 4-methoxy pyridine; benzyl chloroformate in toluene T=-20°C; 0.25 h; 2: ethylmagnesium bromide in tetrahydrofuran; toluene 1 h; 3: With hydrogenchloride in tetrahydrofuran; water; toluene

copper(l) chloride in tetrahydrofuran T=0°C; Inert atmosphere;

1.1: lithium bis(trimethylsilyl)amide / tetrahydrofuran / -78 °C 1.2: tetrahydrofuran / 1 h / -78 °C 2.1: pyridine / 20 °C 3.1: potassium tert-butoxide / tetrahydrofuran / 20 °C View Scheme