1: 3-chloro-benzaldehyde oxime With pyridine; N-chloro-succinimide in tetrahydrofuran T=20 - 60°C; Inert atmosphere; 2: propargyl alcohol With triethylamine in tetrahydrofuran T=50°C; Inert atmosphere;

1.1: pyridine / 20 °C 2.1: pyridine; N-chloro-succinimide / tetrahydrofuran / 20 - 60 °C / Inert atmosphere 2.2: 50 °C / Inert atmosphere View Scheme

diethyl ether

silica gel; pyridinium chlorochromate in dichloromethane T=20°C;

silica gel; pyridinium chlorochromate in dichloromethane T=20°C;