Chloroform → 4-Benzyloxy-7-(2-[4-fluorophenyl]ethoxy)coumarin

Participants

Reaction Steps

A mixture of 4-benzyloxy-7-hydroxycoumarin (5.36; 0.02 mole) anhydrous potassium carbonate (4.0 g) and 1-bromo-2-(4-fluorophenyl) ethane (4.06 g) in acetone (100 ml) was stirred at reflux for 20 hours and the inorganic material filtered off. Evaporation of the filtrate in vacuo gave an oil which rapidly set solid on scratching. Chloroform (200 ml) was added and the mixture filtered to remove unchanged 4-benzyloxy-7-hydroxycoumarin. Reevaporation of the filtrate afforded a white solid, 3.34 g (43%) of m.p. 120°, νmax (mull) 1715, 1675, 1620 cm-1 ; τ(CDCl3); 6.93 (2H, t, J 6.7 Hz); 5.80 (2H, t, J 6.7 Hz); 4.87 (2H,S); 4.38 (1H,); 3.29-2.49 (6H, m) 2.32 (1H, d, J 10 Hz); (Found C, 73.75 H, 5.14 C24H19FO4 requires; C, 73.84; H, 4.91%).

Provenance & Evidence