N-Ethyl-p-toluenesulfonamide → N-Ethyl-N-(3-chloropropyl)-p-toluenesulfonamide

Participants

Reaction Conditions

Reaction Steps

To N-ethyl-p-toluenesulfonamide (5.01 g, 0.0251 mol ) in DMF (50 mL) in a dry flask is added sodium hydride (80% in oil, 0.93 g, 0.031 mol). After gas evolution subsides, 1,3-dichloropropane (22.48 g, 0.199 mol) is added. The mixture is heated at 53° C. for 10 h then cooled and poured into ice water (300 mL), which is extracted twice with ether. The combined extracts are washed with 1% sodium bisulfite, water (3x), and brine. Removal of solvent by rotary evaporation then Kugelrohr distillation gives crude product, which is chromatographed on silica gel (30% hexane/CHCl3) to furnish 2.91 g product (42% ) NMR (CDCl3) δ 1.15 (t, 3H), 1.9-2.2 (m, 2H), 2.44 (s, 3H), 3.11-3.35 (m, 4H), 3.6 (t, 2H), 7.3 (d, 2H), 7.74 (d, 2H).

Provenance & Evidence