Hydrochloric Acid → HCID 178429651, compound

Participants

Reaction Conditions

Reaction Steps

3-Methyl-thiophene-2-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.925 g, 2.4573 mmol) and ethyl formate (0.59 mL, 7.33 mmol) were dissolved in anhydrous ethanol (25 mL). The resulting solution was treated in dropwise fashion with a 21 wt % solution of sodium ethoxide in ethanol (4.583 mL, 12.28 mmol). This reaction mixture was heated at 78° C. for 0.5 h, producing a black oil. Subsequently, the reaction mixture was cooled to room temperature, and then the reaction pH was adjusted to pH 1 with dropwise addition of 1M HCl(aq) causing the formation of a tan precipitate. The suspension was filtered and the solids were washed with 0° C. EtOH to afford the pure 3-Methyl-thiophene-2-carboxylic acid [3-(3-hydroxymethylene-2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.6659 g, 1.65 mmol, 67%).

Provenance & Evidence