反应条件
1.1: hydrogen bromide / water / 16 h / 110 - 140 °C 2.1: trichlorophosphate / N,N-dimethyl-formamide / 3 h / 120 °C 2.2: 0.75 h / 0 - 40 °C 3.1: potassium carbonate / N,N-dimethyl-formamide / 24 h / 30 °C 4.1: toluene; tetrahydrofuran / 0.5 h / 0 °C / Inert atmosphere 4.2: 4 h / 20 °C View Scheme