1: With N-(trimethylsilyl)-imidazole in toluene T=55°C; 6 h; Inert atmosphere; 2: With citric acid in methanol; toluene T=20°C; 1 h; Inert atmosphere; Reagent/catalystTemperature;

1: With 1,8-diazabicyclo[5.4.0]undec-7-ene in toluene T=20°C; 6 h; Inert atmosphere; 2: With citric acid in methanol; toluene T=20°C; 1 h; Inert atmosphere; Reagent/catalystTemperature;