4H-呋喃[3,2-B]吡咯-5-羧酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 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). The solvent was removed in vacuo washed with H2O (1×) and brine (1×) dried with Na2SO4 filtered concentrated Purification by HPLC