3-Amino-9-ethylcarbazole → HCID 86729738, compound

Participants

Reaction Steps

To a solution of 3-amino-9-ethylcarbazole (500 mg, 2.38 mmol), 4-(tert-butoxycarbonylamino)butyric acid (483 mg, 2.38 mmol) and DIEA (1.246 mL, 7.13 mmol) in DMF (12 mL) was added HATU (1085 mg, 2.85 mmol), and the mixture was stirred at room temperature for 3 days. To the reaction solution was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (solvent gradient; 10 to 75% ethyl acetate/hexane) to give crude tert-butyl 4-(9-ethyl-9H-carbazol-3-ylamino)-4-oxobutylcarbamate (1080 mg, 2.73 mmol, 115%) as a pale-yellow powder.

Provenance & Evidence