2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 1,1,1,3,3,3-hexafluoro-2-[1-(2-hydroxy-1-phenyl-ethyl)-2-methyl-1H-indol-5-yl]-propan-2-ol

Participants

Reaction Conditions

Reaction Steps

A solution of 40 mg (0.094 mmol) 1,1,1,3,3,3-hexafluoro-2-[1-(2-hydroxy-1-phenyl-ethyl)-2-methyl-2,3-dihydro-1H-indol-5-yl]-propan-2-ol (example 70) in 1 mL of toluene was treated with 45 mg (0.47 mmol) of MnO2. After stirring at 80° C. for 8 hrs, 0.5 mL of dioxane and 22 mg (0.094 mmol) of DDQ were added. The resulting mixture was stirred at RT overnight and poured into a saturated aqueous solution of NH4Cl and Et2O. The phases were separated and the aqueous one was extracted with Et2O. The combined organic phases were dried over Na2SO4 and evaporated. Column chromatography on silica gel with n-heptane/EtOAc 2:1 yielded 15 mg (38%) of 1,1,1,3,3,3-hexafluoro-2-[1-(2-hydroxy-1-phenyl-ethyl)-2-methyl-1H-indol-5-yl]-propan-2-ol, brown oil, MS: 418 (MH+).

Provenance & Evidence