A small screw cap test tube was charged with Thiophene-2-carboxylic acid [4-(3-hydroxymethylene-2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (100 mg, 0.257 mmol) and THF (2 mL). To the resulting solution was added N-(4-aminophenyl)morpholine (50.2 mg, 0.282 mmol), and the mixture was stirred for 24 h at 65° C. Subsequently, the reaction mixture was cooled to room temperature. EtOAc and Hexanes were added to the reaction mixture. The solid precipitate that formed was washed with ˜1 mL of i-prOH yielding 71% (100 mg, 0.181 mmol) of the title compound.
