Tris(hydroxymethyl)aminomethane → HCID 57435084, compound

Participants

Reaction Conditions

Reaction Steps

Ethylpyrrole-2-carboxylate (1.0195 g, 7.33 mmol) in a minimal amount of dichloroethane was added to an ice cooled stirring mixture of aluminum chloride (1.934 g, 14.5 mmol) and 4-chlorobenzeneacetyl chloride (2.7841 g, 14.73 mmol) in dichloroethane (10.9 mL, 0.67 M) under N2. After stirring 10 min, the ice bath was removed, and the reaction was stirred at room temperature for 60 minutes, with little change by TLC (9:1 Hexanes:EtOAc): After heating to 60° C. for an additional hour, only a small quantity of starting material was left by TLC. The reaction was cooled to room temperature, PS-Trisamine™ resin (6.3954 g, 24.30 mmol) and dichloroethane (10 mL) were added, and the reaction was stirred for 3 hours. 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, concentrated, and purified by silica gel chromatography (Combiflash column, 95:5 to 50:50 Hexanes:EtOAc) to obtain 1.0345 g (48.4%) 37 as a pale orange solid. Note. A small amount of CH2Cl2 was required to solubilize the crude product before placement on the silica column. 1H (CDCl3, 400 MHz): δ 10.07 (1H, broad s), 7.55-7.52 (1H, m), 7.33-7.30 (1H, m), 7.27 (2H, d, J=8.3 Hz), 7.14 (2H, d, J=8.3 Hz), 4.35 (2H, q, J=7.0 Hz), 4.04 (2H, s), 1.37 (3H, t, J=7.1 Hz) ppm. 13C (CDCl3, 100 MHz): δ 192.55, 160.97, 133.10, 132.75, 130.76, 128.69, 126.80, 126.25, 124.30, 114.95, 61.06, 45.79, 14.31 ppm. DEPT (CDCl3, 100 MHz): CH3 carbons: 14.31; CH2 carbons: 61.06, 45.79; CH carbons: 130.76, 128.69, 126.80, 114.96 ppm. HPLC: 10.049 min.

Provenance & Evidence