反应详情

A stirred solution of 4-(4-chloro-2-fluorophenyl)nicotinaldehyde (1.8 g, 7.64 mmol) (prepared as described in Example 5, Part B) and TMS-CF3 (0.521 mL, 3.52 mmol) in dichloromethane (20 mL) was stirred at 0° C. for 20 min. TBAF (1.0 M in THF) (0.4 mL, 1.528 mmol) was added dropwise slowly and the solution stirred for 90 min. Water was added and the solution extracted with dichloromethane (2×25 mL). The combined organic layers were washed with brine, dried over sodium sulphate, concentrated and purified by Prep. TLC using 25% ethyl acetate in hexane to give 1-(4-(4-chloro-2-fluorophenyl)pyridin-3-yl)-2,2,2-trifluoroethanol (1 g, 2.64 mmol, 35% yield) as a yellow oil. LCMS (ESI) m/e 306.0 [(M+H)+, calcd for C13H9ClF4NO 306.02]; LC/MS retention time (Method C): tR=2.05 min.

1. extractionthe solution extracted with dichloromethane (2×25 mL)
2. washThe combined organic layers were washed with brine
3. dry with materialdried over sodium sulphate
4. concentrationconcentrated
5. custompurified by Prep