A mixture of 2-n-butyl-3-(3,5-diiodo-4-hydroxybenzoyl)benzofuran 1.0 g (1.83 mmol) and potassiumcarbonate 0.56 g (4 mmol) in aceton (dry) 100 ml, α-brom ethylacetate 1.0 g (12 mmol) was added, and the solution was extracted with 100 ml water. The organic layer was evaporated to dryness and the yellow rest was dissolved in methanol 50 ml+1M NaOH 50 ml. The solution was heated to 50° C. for 15 h, extracted with 3×75 ml dichloromethane, and dried (MgSO4). Evaporating the solution and purification on silica gave 0.55 g (005).
