Sulfuryl chloride → 2,2,2-trichloro-1-(4-chloro-1H-pyrrol-2-yl)ethan-1-one

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To a solution of 2-(trichloroacetyl)pyrrole (4.0 g, 18.83 mmol) in chloroform (28 ml) at 0° C. was added sulfuryl chloride (13 mL, 13.2 mmol). The mixture was stirred for 17 hours at room temperature. TLC analysis indicated 50% conversion of starting material. Sulfuryl chloride (13 mL, 13.2 mmol) was added and the reaction mixture was stirred for another 4 hours at room temperature. The reaction was quenched with distilled water (50 mL). CH2Cl2 (50 mL) was added to the reaction and the solution was transferred to a separatory funnel and the organic layer was isolated while the aqueous layer was back extracted with CH2Cl2 (2×50 mL). The combined organic layers were collected, dried (MgSO4), filtered, and concentrated in vacuo to yield 3.5 g of the above compound (14.18 mmol, yield 75%). 1H-NMR (CDCl3-d1) δ 9.45 (s, 1H), 7.27 (dd, J=2.8, 1.6, 1H), 7.12 (dd, J=3.2, 1.6 Hz, 1H).

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