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a) Diethylchlorophosphate, anhydrous pyridine, rt, 69%; b) 2M NH3 in i-PrOH, 70 °C, 65%; c) Dowex-50 resin, MeOH:H2O (1:1, v/v), 55°C (rt for 9), 59% (7), 43% (8), 9% (9), 49% (16); d) Diisopropylchlorophosphate, anhydrous pyridine, rt, 49%.
