反应详情

A mixture of (R)-3-(3-fluorophenyl)-5-(hydroxymethyl)-2-oxooxazolidine (PREPARATION 14, 1.800 g, 8.52 mmol) in dry pyridine (10 ml) is cooled to 5° and then treated with p-toluenesulfonyl chloride (1.706 g, 8.95 mmol). The mixture is left at this temperature ovemight. TLC with methanol/chloroform (5/95) or hexane/ethyl acetate (1/1) indicates the starting material is consumed. The reaction mixture is dumped into ice water (30 ml) and the resultant precipitate collected by vacuum filtration through a medium-porosity sintered glass funnel. The collected solids are thoroughly washed with cold water, dried under reduced pressure and recrystallized from ethyl acetate/hexane to give the title compound, mp 114°-115°: [α]25D -62.6° (c 1.0, CH3CN); IR (mineral oil mull): 1751, 1617, 1591, 1499, 1415, 1362, 1227, 1202, 1191, 1172, 1093, 967 cm-1 ; NMR (CDCl3, 300 MHz) δ 7.78, 7.38, 7.36, 7.33, 7.16. 6.86, 4.84. 4.29. 4.24. 4.10. 3.88, 2.46; MS (m/z) 365, 149, 122, 91; HRMS (m/z) 365.0738 (calc'd for C17H16FNO5S: 365.0733).

1. temperatureis cooled to 5°
2. waitThe mixture is left at this temperature ovemight
3. customis consumed
4. filtrationthe resultant precipitate collected by vacuum filtration through a medium-porosity sintered glass funnel
5. washThe collected solids are thoroughly washed with cold water
6. customdried under reduced pressure
7. customrecrystallized from ethyl acetate/hexane