Dimethylformamide → 2-(5-Methoxy-pent-1-yn-1-yl)-benzenesulfonamide

Beteiligte Stoffe

Reaktionsschritte

135 ml of N,N-dimethylformamide and 22 ml of triethylamine are taken and 7.5 g of 2-iodobenzenesulfonamide, 2.6 g of pent-4-yn-1-yl-methyl ether as well as 0.067 g of copper(I) iodide and 0.144 g of bis(triphenylphosphine)palladium(II) dichloride are added. The reaction mixture is heated to 65° and stirred for 22 hours at that temperature under argon. After that time, the N,N-dimethylformamide is distilled off at 0.1 torr and 40°. The crude product is purified on 500 g of silica gel (Merck Si 60, 40-63 μm) with hexane/ethyl acetate=2/1 as eluant. The fractions containing the product are concentrated by evaporation at 15 torr and 40° to yield white crystalline 2-(5-methoxy-pent-1-yn-1-yl)-benzenesulfonamide, melting point: 59°-61°.

Herkunft & Nachweise