Potassium Hydroxide → 4-[2-(tert-butoxycarbonylamino)ethoxy]-N-(3-iodophenyl)-3-methoxyphenylacetamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of Intermediate 1 (8.4 g), 1,2-dibromethane (160 ml), 40% aqueous potassium hydroxide solution (45 ml) and 40% aqueous tetrabutylammonium hydroxide solution (4.5 ml) is heated with stirring at 40° C. for 18 hours. The reaction solution is washed with water, and the organic layer is dried over sodium sulfate, and the solvent is evaporated under reduced pressure. The residue is dissolved in dimethylformamide (45 ml), and thereto is added potassium phthalimide (1.9 g). The mixture is stirred at 50° C. for 18 hours. The reaction solution is poured into ice-water, and the mixture is extracted with chloroform. The extract is washed with water, and the solvent is evaporated under reduced pressure. The residue is dissolved in ethanol (50 ml), and thereto is added hydrazine monohydrate (600 mg), and heated under reflux for 3 hours. The insoluble materials are removed by filtration, and the filtrate is concentrated, extracted with chloroform, washed with water, and the solvent is evaporated under reduced pressure. The residue is dissolved in chloroform (50 ml) and thereto is added di-tert-butyl dicarbonate (4.3 g). The mixture is stirred at 25° C. for 18 hours, and the solvent is evaporated under reduced pressure. The residue is purified by silica gel column chromatography (eluent: gradient from 0% to 100% hexane/ethyl acetate) to give the desired compound (5.2 g).

Herkunft & Nachweise