3-Chloro-2-methyl-1-propene → Benzenesulfonamide, 4-methyl-N-(2-methyl-2-propenyl)-N-2-propenyl-

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Reaction Steps

3-Chloro-2-methylpropene (20 mL, 0.20 mol) is added over a period of 5 minutes to a suspension of 4-methyl-N-(prop-2-en-1-yl)benzene-1-sulphonamide (27.9 g, 0.13 mol) and potassium carbonate (28.1 g, 0.20 mol) in N,N-dimethylformamide (200 mL) cooled in an ice bath. After 20 minutes, the suspension is stirred at ambient temperature for 18 hours. The suspension is concentrated to dryness. The residue is taken up in ethyl acetate (250 mL) and water (110 mL). The aqueous phase is extracted with ethyl acetate (2×50 mL). The combined organic phases are washed successively with aqueous 3N HCl solution (50 mL), water (3×50 mL), aqueous 5% potassium bicarbonate solution (50 mL), and finally brine (50 mL). The organic phase is dried over Na2SO4, filtered and concentrated to obtain the expected compound in the form of an oil.

Provenance & Evidence