[2-bromo-6-(trifluoromethyl)phenyl]methanol

反応条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a 2.5 M solution of n-BuLi in hexane (27.81 mL, 69.53 mmol) in dry THF (30 mL), cooled to −78° C. and under an Argon atmosphere was added a solution of (2-bromo-6-(trifluoromethyl)phenyl)methanol (CXXIX) (5.49 g, 23.16 mmol) in dry THF (30 mL) dropwise very slowly. The reaction mixture was stirred at −78° C. for 2 h before adding trimethyl borate (3.88 mL, 34.76 mmol). The reaction mixture was stirred at −78° C. for an additional 30 min, and then allowed to warm up slowly to room temperature and stirred overnight. The reaction was then cooled to 0° C. and slowly quenched with 2 M HCl and stirred for 2.5 h at room temperature. The reaction mixture was extracted with EtOAc and the organic layer was dried over anhydrous MgSO4. The solvent was removed under reduced pressure and the crude product was purified by silica gel chromatography using (100:1 DCM/MeOH) to give 4-(trifluoromethyl)benzo[c][1,2]oxaborol-1(3H)-ol (CXXX) as an orange oil (1.17 g, 5.79 mmol, 25% yield). ESIMS found for C8H6BF3O2 m/z 201.4 (M−H). The reaction mixture was stirred at −78° C. for an additional 30 min to warm up slowly to room temperature stirred overnight The reaction was then cooled to 0° C. slowly quenched with 2 M HCl stirred for 2.5 h at room temperature The reaction mixture was extracted with EtOAc the organic layer was dried over anhydrous MgSO4 The solvent was removed under reduced pressure the crude product was purified by silica gel chromatography

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To 1-bromo-2-(bromomethyl)-3-(trifluoromethyl)benzene (CXXVIII) (7.51 g, 23.62 mmol) was added an aqueous saturated solution of NaHCO3 (400 mL). The reaction mixture was vigorously stirred and refluxed overnight. The reaction mixture consisted of an upper aqueous layer and a bottom oily layer, which solidified in an ice bath. The water layer was decanted and the solid was dissolved in EtOAc, dried over anhydrous MgSO4, filtrated and evaporated to dryness to give (2-bromo-6-(trifluoromethyl)phenyl)methanol (CXXIX) as an orange oil (5.49 g, 23.16 mmol, 98%). 1H NMR (DMSO-d6) δ ppm 4.67 (d, J=4 Hz, 2H), 5.23 (t, J=5 Hz, 1H), 7.43 (dd, J=8 Hz, J=8 Hz, 1H), 7.75 (d, J=8 Hz, 1H), 7.96 (d, J=8 Hz, 1H); 19F NMR (DMSO-d6) δ ppm −56.33 (s, 3F); ESIMS found for C8H6BrF3O m/z 237.3 (M+H). refluxed overnight a bottom oily layer, which solidified in an ice bath The water layer was decanted the solid was dissolved in EtOAc dried over anhydrous MgSO4 filtrated evaporated to dryness