Acetic Acid → HCID 86696075, compound

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, n-butyllithium (1.63 M, 8.71 mL, 14.20 mmol) was slowly added dropwise, at −60° C. or lower, to a THF (40 mL) solution of compound (87) (4.29 g, 12.91 mmol) prepared in Example 11. The reaction mixture was agitated at −60° C. or lower for 1 hour, and then trimethyl borate (1.61 g, 15.49 mmol) was slowly added dropwise thereto. The reaction mixture was returned to room temperature, and then acetic acid (1.16 g, 19.37 mmol) and hydrogen peroxide water (2.93 g, 25.80 mmol) were added thereto, and the resultant mixture was agitated for 3 hours. The reaction mixture was quenched with a saturated aqueous solution of ammonium chloride, and extracted with 50 mL of toluene three times. Combined organic layers were washed with a sodium thiosulfate aqueous solution, a saturated aqueous solution of sodium hydrogencarbonate, water and saturated brine, and then dried over magnesium sulfate, and a solvent was distilled off by an evaporator. The residue was purified by silica gel column chromatography, and thus 7-ethoxy-1,8,9,9,10,10-hexafluoro-9,10-dihydrophenanthrene-2-ol (91) (3.76 g, yield 84.0%) was obtained.

Provenance & Evidence