反应详情

A solution of 4(S)-(−)-benzyl-2-oxazolidinone (10 g, 56.43 mmol) in anhydrous THF (200 ml) at −78° C. was treated with a 2.5M solution of n-butyl lithium in hexanes (23.70 ml, 59.26 mmol) with stirring. The reaction mixture was allowed to stir at −78° C. for 30 min before valeryl chloride (7.57 ml, 62.10 mmol) was added. The reaction mixture was then allowed to warm to ambient temperature over 15 h after which it was diluted with NH4Cl solution, diluted with ethyl acetate and washed with brine. The organic phase was dried (Na2SO4) and concentrated to give a gum. This was purified by flash chromatography (10% EtOAc in 40/60 hexanes) to give the sub-title compound (14.61 g, 99%) as a colourless oil: 1H NMR (400 MHz, CDCl3) δ 0.94-1.20 (3H, m), 1.35-1.50 (2H, m), 1.62-1.80 (2H, m), 2.74-2.84 (1H, m), 2.86-3.08 (2H, m), 3.27-3.39 (1H, m), 4.11-4.26 (2H, m), 4.62-4.76 (1H, m), 7.18-7.40 (5H, m).

1. additionwas added
2. washwashed with brine
3. dry with materialThe organic phase was dried (Na2SO4)
4. concentrationconcentrated
5. customto give a gum
6. customThis was purified by flash chromatography (10% EtOAc in 40/60 hexanes)