反应详情

A solution of (5R)-5-(hydroxymethyl)-1,3-oxazolidin-2-one (10.0 g), prepared as described in Tetrahedron: Asymmetry 1995, 6, 1181-1190, in pyridine (60 mL) at −10° C. was treated with para-toluenesulfonyl chloride (21.2 g), stirred for 2 hours, poured into 1:1 brine/water (100 mL), and extracted with ethyl acetate. The extract was washed with 1:1 saturated sodium bicarbonate/water and 1:1 brine/water, and the washes were back extracted with ethyl acetate. The combined extracts was dried (MgSO4), filtered, and concentrated to provide the desired product. MS (ESI(+)) m/e 272 (M+H)+; 1H NMR (300 MHz, CDCl3) δ 7.80 (d, 2H), 7.39 (d, 2H), 4.80 (m, 1H), 4.18 (d, 2H), 3.70 (t, 1H), 3.50 (dd, 1H), 2.45 (s, 3H).

1. extractionextracted with ethyl acetate
2. washThe extract was washed with 1:1 saturated sodium bicarbonate/water and 1:1 brine/water
3. extractionthe washes were back extracted with ethyl acetate
4. dry with materialThe combined extracts was dried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated