1: 97 percent / methanol / 36 h / 20 °C 2: triphenylphosphine; thionyl chloride / CH2Cl2 / 1 h / 20 °C 3: 1.50 g / triethylamine / CH2Cl2 / 2 h / 20 °C 4: 99 percent / acetic acid; HBr / 1 h / 0 - 20 °C View Scheme
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