[4,5-dihydro-4,4-dimethyl-2-phenyloxazole Ru(CH3CN)4]PF6 in dichloromethane T=20°C; 0.0833333 h; Inert atmosphere;

sodium carbonate in acetonitrile 16 h; Reflux;

1: N,N'-di-p-toluenesulfonylhydrazine; 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 1 h / 0 - 20 °C / Inert atmosphere 2: [4,5-dihydro-4,4-dimethyl-2-phenyloxazole Ru(CH3CN)4]PF6 / dichloromethane / 0.08 h / 20 °C / Inert atmosphere View Scheme