反应详情

Thioacetic acid S-[2-(4-fluoro-phenyl)-ethyl]ester (9.9 g, 50 mmol) was dissolved in anhydrous THF (300 mL) and LiAlH4 (7.5 g, 200 mmol) was added in several small portions. After the addition was completed the mixture was stirred for 2 h at room temperature then cooled down to 0° C. and excess LiAlH4 was hydrolyzed by the addition of H2O (10 mL) and aq. HCl (2N, 200 mL). The resulting clear solution was extracted with EtOAc (3×200 mL) and the combined organic layers were dried (MgSO4) and evaporated under reduced pressure. The unpleasant smelling crude product (8.17 g, 104%) was carried on into the next step as obtained. 1H NMR (400 MHz, CDCl3): δ 7.17 (dd, 2H), 7.02 (t, 2H), 2.89 (t, 2H), 2.78 (dd, 2H), 1.38 (t, 1H).

1. additionAfter the addition
2. temperaturethen cooled down to 0° C.
3. extractionThe resulting clear solution was extracted with EtOAc (3×200 mL)
4. dry with materialthe combined organic layers were dried (MgSO4)
5. customevaporated under reduced pressure
6. customas obtained