反应详情

A solution of (4(S)-phenyloxazolidin-2-on-3-yl)acetic acid (1 g, 4.52 mmol) (prepared according to Evans in U.S. Pat. No. 4,665,171) in 20 mL of anhydrous methanol was treated hourly with 5 equivalents of acetyl chloride, for a total of 20 equivalents. The resulting solution was stirred overnight. The residue obtained after evaporation of the MeOH was redissolved in 30 mL of CH2Cl2 and treated with 50 mL of saturated aqueous Na2CO3. The organic layer was evaporated and dried (MgSO4) to yield the title compound as a colorless oil (1.001 g, 94%); 1H NMR (CDCl3) δ 3.37 (d, J==18.0 Hz, 1H), 3.69 (s, 3H), 4.13 (t, J=8.3 Hz, 1H), 4.28 (d, J=18.0 Hz, 1H), 4.69 (t, J=8.8 Hz, 1H), 5.04 (t, J=8.4 Hz, 1H), 7.26-7.29 (m, 2H), 7.36-7.42 (m, 3H).

1. customThe residue obtained
2. customafter evaporation of the MeOH
3. dissolutionwas redissolved in 30 mL of CH2Cl2
4. additiontreated with 50 mL of saturated aqueous Na2CO3
5. customThe organic layer was evaporated
6. dry with materialdried (MgSO4)