反应详情

A solution of the above ethyl 2-ethoxycarbonyl-9-oxa-12-thiatetradecanoate (2 g, 5.8 mmol) in 20% NaOH (10 mL) was refluxed for 6 h. The solution was acidified with HCl (pH 2), and extracted with ethyl acetate (120 mL). The organic phase was washed with water (2×30 mL), brine (30 mL) and dried (Na2SO4). After evaporation of the solvent, the resulting product was heated on an oil bath at 180° to 200° C. for 15 min. The crude product was purified by Kugelrohr distillation to afford the title compound, 9-oxa-12-thiatetradecanoic acid (1.4 g, 98%); bp 121°-125° C./0.005 torr; IR(neat):3020 (broad) and 1730 cm-1 ; NMR: 1.27 (3H, t, J=7.7 Hz), 1.34 (6H, m), 1.53-1.68 (4H, m), 2.36 (2H, t, J=7.1 Hz), 2.58 (2H, q, J=7.7 Hz), 2.71 (2H, t, J=7 Hz), 3.45 (2H, t, J=6.8 Hz), 3.59 (2H, t, J=7 Hz), and 10.6 ppm (1H, br s); Found: C, 58.11, H, 9.8%. Calcd for C12H24SO3 : C, 58.03, H, 9.74%.

1. extractionextracted with ethyl acetate (120 mL)
2. washThe organic phase was washed with water (2×30 mL), brine (30 mL)
3. dry with materialdried (Na2SO4)
4. customAfter evaporation of the solvent
5. temperaturethe resulting product was heated on an oil bath at 180° to 200° C. for 15 min
6. distillationThe crude product was purified by Kugelrohr distillation