Ammonium Chloride → 1-[2-Methyl-5-(2,2,2-trifluoro-1-triethylsilanyloxy-1-trifluoromethyl-ethyl)-2,3-dihydro-indol-1-yl]-2-phenyl-ethanone

関与物質

反応手順

A solution of 101 mg (0.24 mmol) of 2-methyl-5-(2,2,2-trifluoro-1-triethylsilanyloxy-1-trifluoromethyl-ethyl)-2,3-dihydro-1H-indole (example 51.2) in CH2Cl2 was treated with 0.05 mL (0.3 mmol) of DIPEA and then with 0.03 mL (0.24 mmol) of phenylacetylbromide at 0° C. The mixture was stirred at RT for 3 hrs and then distributed between Et2O a saturated aqueous solution of NH4Cl. The combined organic phases were dried over Na2SO4 and evaporated to yield 120 mg of 1-[2-methyl-5-(2,2,2-trifluoro-1-triethylsilanyloxy-1-trifluoromethyl-ethyl)-2,3-dihydro-indol-1-yl]-2-phenyl-ethanone. This crude was dissolved in 2 mL of THF and treated with 0.9 mL of a 1M BH3 soution in THF. After stirring for 10 hrs at RT the mixture was distributed between Et2O and a saturated aqueous solution of NH4Cl. The combined organic phases were dried over Na2SO4 and evaporated to yield 135 mg of 2-methyl-1-phenethyl-5-(2,2,2-trifluoro-1-triethylsilanyloxy-1-trifluoromethyl-ethyl)-2,3-dihydro-1H-indole, of which 30 mg were dissolved in 1 mL of THF and treated with 0.07 mL of 1M TBAF in THF. Stirring for 30 min, evaporation, and column chromatography on silica gel with n-heptane/EtOAc (4:1) yielded 12 mg (51%) of 1,1,1,3,3,3-hexafluoro-2-(2-methyl-1-phenethyl-2,3-dihydro-1H-indol-5-yl)-propan-2-ol, colorless waxy solid, MS: 404 (MH+).

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