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Journal of Medicinal Chemistry, 1991 , vol. 34, # 8 p. 2525 - 2547
1: thionyl chloride; N,N-dimethyl-formamide / benzene / 2 h / Inert atmosphere; Reflux 2: AlCl3, aluminium chloride / dichloromethane / 0 - 25 °C / Inert atmosphere 3: sulfuryl dichloride / dichloromethane / 1 h / 0 °C / Inert atmosphere 4: boron tribromide / dichloromethane / 1 h / 0 °C / Inert atmosphere View Scheme
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