1: Methyltriphenylphosphonium bromide With n-butyllithium in tetrahydrofuran; hexane T=0 - 20°C; Wittig Olefination; 0.5 h; Inert atmosphere; 2: 1-acetyl-4-oxopiperidine in tetrahydrofuran; hexane T=20°C; Wittig Olefination; 24 h; Inert atmosphere;