1: POCl3 / pyridine / 15 h / Ambient temperature 2: 84 percent / HBF4 / CH2Cl2; diethyl ether / 0.5 h / -30 °C 3: 10 N aq. NaOH / CH2Cl2; methanol / 24 h / 20 °C View Scheme

trichlorophosphate in pyridine 15 h; Ambient temperature; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

trichlorophosphate in pyridine 15 h; Ambient temperature; Yield given. Yields of byproduct given. Title compound not separated from byproducts;