1: Methyltriphenylphosphonium bromide With potassium tert-butylate in tetrahydrofuran T=20°C; 1 h; Inert atmosphere; 2: trans-Boc-4-aminocyclohexanecarbaldehyde in tetrahydrofuran T=20°C; 0.5 h; 3: With sodium hydrogen sulphate; water in tetrahydrofuran