Sulfuryl chloride → Ethyl 2-chloro-4H-furo[3,2-b]pyrrole-5-carboxylate

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Reaction Steps

Under a N2 atmosphere, sulfuryl chloride (0.15 mL, 1.85 mmol) was added dropwise over 10 min to a stirring solution of ethyl 4H-furo[3,2-b]pyrrole-5-carboxylate (300 mg, 1.67 mmol) in ether (7.5 mL). The reaction was stirred at rt for 4 h. The solvent was removed in vacuo. The residue was taken up in DCM and washed with H2O (1×) and brine (1×), then dried with Na2SO4, filtered and concentrated. Purification by HPLC gave 160 mg of ethyl 2-chloro-4H-furo[3,2-b]pyrrole-5-carboxylate. 1H NMR (400 MHz, CDCl3) δ (ppm): 8.98 (s, 1H), 6.76 (s, 1H), 6.34 (s, 1H), 4.35 (q, 2H), 1.38 (t, 3H).

Provenance & Evidence