O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; triethylamine in dichloromethane T=20°C; 4 h; Inert atmosphere;

1.1: ethanol / 0.5 h / 20 °C / |Inert atmosphere 1.2: 5 h / |Reflux; |Inert atmosphere 2.1: lithium hydroxide hydrate; water / methanol / 0 - 20 °C / |Inert atmosphere 3.1: triethylamine; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate / dichloromethane / 4 h / 20 °C / |Inert atmosphere View Scheme

1: lithium hydroxide hydrate; water / methanol / 0 - 20 °C / |Inert atmosphere 2: triethylamine; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate / dichloromethane / 4 h / 20 °C / |Inert atmosphere View Scheme

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