Hydrochloric Acid → HCID 11535906, compound

Participants

Reaction Conditions

Reaction Steps

Ethoxycarbonyl isothiocyanate (0.13 ml, 1.1 mmol) was added to 3-(butylamino)-1H-pyrrole-2-carboxylic acid ethyl ester (0.23 g, 1.1 mmol) in toluene (5 mL) and the mixture was heated at 90° C. for 1 h. The precipitate was filtered off and washed with hexane. The intermediate product was treated with potassium hydroxide (0.55 g, 9.9 mmol) in water (9 mL), and heated to reflux for 15 h. After cooling to ambient temperature, the pH was adjusted to pH 5 with 12 M HCl. The resultant precipitate was collected by filtration and washed with water. The crude product was purified using preparative HPLC to give the title compound (16 mg, 6%) as a solid.

Provenance & Evidence