Hydrochloric Acid → 2-(4-Chloro-phenylsulfonyl)-3-(3,5-dichlorophenylamino)-3-methylsulfanyl-2-propenenitrile

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Reaction Steps

To a solution of 4-chlorophenylsulfonylacetonitrile (1.00 g, 4.6 mmol) in dry acetone (10 ml) first dry potassium carbonate (1.28 g, 9.3 mmol) and then 3,5-dichlorophenyl isothiocyanate (0.99 g, 4.9 mmol) were added. The resulting mixture was stirred at room temperature under nitrogen for 4 h, and then filtered. To the filtrate methyl iodide (0.86 ml, 13.9 mmol) was added. The mixture was stirred at room temperature for 45 min. Then pH was adjusted to 1 with 1N aqueous HCl. The precipitate was filtered off and washed with water to give 1.86 g (93%) of a crude product. Recrystallisation from ethyl acetatelheptane (1:1) gave 1.42 g (72%) of the title compound contaminated with 4-chlorophenylsulfonylacetonitrile. Mp 128-131° C. 1H NMR (200 MHz, CDCl3): δ=2.25 (s, 3H), 7.20 (d, 2H), 7.30 (t, 1H), 7.55 (d, 2H), 7.85 (d, 2H), 9.80 (br s, 1H); EI SP/MS: 434 (M+), 436 (M+2).

Provenance & Evidence