Dihydrobenzofuran → 2,3-Dihydrobenzofuran-5-sulfonyl Chloride

Beteiligte Stoffe

Reaktionsschritte

Chlorosulphonic acid (43.4 g, 0.366 mol) in DCM (10 mL) was added to a cold solution (5° C.) of 2,3-dihydrobenzofuran (20 g, 0.166 mol) in DCM (200 mL). After the addition the reaction was left with stirring at room temperature overnight. The reaction mixture was quenched with water (150 mL) keeping the temperature below 10° C. The organic phase was separated and washed with an aqueous solution of NaHCO3 (13.9 g dissolved in 150 mL of water). The organic solvents were evaporated to yield the title compound as a solid residue 3.3 g (23%). 1H NMR 270 MHz (CDCl3) δ ppm 3.32 (t, J=8.91 Hz, 2H) 4.75 (t, J=8.91 Hz, 2H) 6.90 (d, J=9.15 Hz, 1H) 7.78-7.90 (m, 2H)

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