反应条件
1: AlCl3, aluminium chloride / dichloromethane / 12 h / 20 °C
2: pyridine / dichloromethane / 3 h / 45 °C / Cooling with ice
3: sodium hydride / dimethyl sulfoxide / 12 h / 100 °C
4: potassium carbonate / N,N-dimethyl-formamide / 12 h / 50 - 60 °C
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