Ethyl 1H-pyrrole-2-carboxylate → HCID 57435102, compound

Participants

Reaction Steps

Ethylpyrrole-2-carboxylate (2.0589 g, 14.80 mmol) in a minimal amount of dichloroethane was added to an ice cooled stirring mixture of aluminum chloride (3.9913 g, 29.93 mmol) and 4-fluorophenylacetyl chloride (5.1338 g, 29.75 mmol) in dichloroethane (22 mL, 0.66 M) under N2. The ice bath was removed, and the reaction was stirred at room temperature for 3.5 h. 20.6195 g (2.6 mMol/g) Polyamine resin HL (200-400 mesh) and dichloroethane (20 mL) were added, and the reaction was stirred for ˜60 min. The reaction was then filtered through a glass-fritted funnel directly into ice water. The resin was rinsed with CH2Cl2, then the organic layers were removed, dried with Na2SO4, filtered and concentrated. When 6.5 mL of 80:20 Hexanes: EtOAc were added, the organic liquid turned yellow, leaving behind a tan solid. The solid was removed by filtration, rinsed with 80:20 Hexanes: EtOAc, and dried to obtain pure 71 (2.1838 g, 53.6%). 1H (CDCl3, 400 MHz): δ 10.03 (1H, broad s), 7.54 (1H, s), 7.32 (1H, s), 7.23 (2H, dd, J=8.6, 5.3 Hz), 6.99 (2H, t, J=8.6 Hz), 4.35 (2H, q, J=7.1 Hz), 4.04 (2H, s), 1.37 (3H, t, J=7.1 Hz) ppm. 13C (CDCl3, 100 MHz): δ 192.81, 161.84 (d, J=244 Hz), 160.95, 130.89 (d, J=7.8 Hz), 130.37 (d, J=3.2 Hz), 126.72, 126.36, 124.30, 115.40 (d, J=21.4 Hz), 114.96, 61.02, 45.63, 14.29 ppm. DEPT (CDCl3, 100 MHz): CH3 carbons: 14.29; CH2 carbons: 61.02, 45.63; CH carbons: 130.89 (d, J=7.8 Hz), 126.72, 115.40 (d, J=21.4 Hz), 114.96 ppm. HPLC: 9.689 min.

Provenance & Evidence