Sodium Bicarbonate → (5R)-3-(3-Fluoro-4-(2-methylimidazol-1-yl)phenyl)-5-hydroxymethyloxazolidin-2-one

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Reaktionsschritte

5-Benzyloxycarbonylamino-2-(2-methylimidazol-1-yl)fluorobenzene (54 g, 0.166 M) was dissolved in a mixture of dry tetrahydrofuran (600 ml) and 1,3-dimethyl-2,4,5,6-tetrahydro-2(1H)-pyrimidinone (100 ml) under nitrogen, cooled to −70°, and treated with a solution of n-butyllithium (1.6 M in isohexane, 114 ml), over 30 minutes. After stirring for 30 minutes at −70°, a solution of (R)-glycidylbutyrate (26.35 g, 0.183 M) in dry tetrahydrofuran (50 ml) was added over 15 minutes. Stirring was continued for 16 hours allowing the temperature to rise to ambient. The mixture was treated with aqueous sodium bicarbonate.(5%, 500 ml) and ethyl acetate (800 ml), the organic layer separated, and the aqueous extracted with further ethyl acetate (3×750 ml). The combined extracts were dried (magnesium sulfate) and evaporated, and the resulting oil triturated with diethyl ether. The resulting solid was recrystallised from isopropanol to give the title compound (21.5 g). NMR (DMSO-d6) δ: 2.16 (s, 3H); 3.56 (dt, 1H); 3.69 (dt, 1H); 3.88 (dd, 1H); 4.15 (t, 1H); 4.74 (m, 1H); 5.24 (t, 1H); 6.92 (s, 1H); 7.20 (s, 1H); 7.48 (dd, 1H); 7.53 (t, 1H); 7.74 (dd, 1H). MS (ESP): 292 (MH+) for C14H14FN3O3

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