3-propan-2-yl-1,3-oxazolidin-2-one

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 4 (2-propyl)-oxazo-lidine-2-one in anhydrous tetrahydrofuran (250 mL) under a nitrogen atmosphere at -78° C. were added in a dropwise fashion a solution of butyllithium in hexane (50 mL, 77.4 mmol) over 5 to 10 min. After stirring an additional 20 min at -78° C. 3-phenylpropionyl chloride (12.7 mL, 85.2 mmol) was added neat. The reaction was warmed to room temperature and stirred 1 to 2 h at the temperature. The reaction was quenched by adding 100 mL of saturated aqueous ammonium chloride and the volatiles removed by rotary evaporation. The resulting aqueous residue was extracted three times with ether and the combined organic phases were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. Recrystallization from hexanes/ethyl acetate provided the title compound (16.6 g, 82%). mp =86.5 to 87.5° C. Mass spectrum: (M+NH4)+ =279, (M+H)+=262. Mass spectrum: (M+NH4) The reaction was warmed to room temperature stirred 1 to 2 h at the temperature The reaction was quenched by adding 100 mL of saturated aqueous ammonium chloride the volatiles removed by rotary evaporation The resulting aqueous residue was extracted three times with ether the combined organic phases were washed with brine dried (Na2SO4) filtered concentrated in vacuo Recrystallization from hexanes/ethyl acetate