反应详情

By a method similar to that in Example 178a and using the compound (4.23 g, 22.4 mmol) obtained in Example 180a, 4M hydrogen chloride-ethyl acetate solution (42 mL) and O,O-diethyl dithiophosphate (4.50 mL, 26.8 mmol), the title compound (3.94 g, 79%) was obtained as colorless crystals.