Sodium Iodide → [4-({2-[(2-Hydroxyethyl)oxy]ethyl}oxy)phenyl](4-hydroxyphenyl)methanone

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 4,4′-dihydroxybenzophenone (3.0 g, 13.9 mmol) in DMF (30 mL) was added Cs2CO3 (13.55 g, 41.6 mmol). The mixture was heated at 80° C. under nitrogen for 1 h. The stirred reaction was cooled to room temperature and NaI (2.08 g, 13.9 mmol) was added, followed by dropwise addition of a solution of 2-(2-chloroethoxy) ethanol (1.63 mL, 15.3 mmol) in DMF (7 mL). The reaction mixture was heated at 80° C. under nitrogen overnight. The mixture was cooled to room temperature and quenched with saturated aqueous NH4Cl (100 mL), then extracted with EtOAc (3×60 mL). The organic layers were combined and washed with water, brine, and dried over Na2SO4, then concentrated to a light brown oil which was further purified by chromatography on a silica gel column eluted with a gradient from hexanes to 95% EtOAc:hexanes to give a light brown oil which contained some DMF. The residue was dissolved in EtOAc (100 mL) and further washed with water (2×50 mL), saturated aqueous CuSO4 (50 mL), water (50 mL) and brine (50 mL). The EtOAc solution was dried (Na2SO4) and concentrated to 15 mL and 30 mL of hexanes added. A white solid precipitated and was washed with 1:1 hexanes:EtOAc to afford compound 61 (1.90 g, 45%). mp 126-127° C. 1H NMR (400 MHz, CD3OD): δ 3.60-3.65 (m, 2H), 3.65-3.70 (m, 2H), 3.85-3.90 (m, 2H), 4.20-4.25 (m, 2H), 6.87 (d, J=8.6 Hz, 2H), 7.05 (d, J=8.8 Hz, 2H), 7.67 (d, J=8.6 Hz, 2H), 7.73 (d, J=8.8 Hz, 2H). LRMS (APCI): m/z, 303 (M+H)+, 301 (M−H)−.

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