3-Amino-9-ethylcarbazole → N-(4-cyanophenyl)-5-[(9-ethyl-9H-carbazol-3-yl)amino]-3-methylpentanamide

Participants

Reaction Steps

A solution of the compound obtained in Step 2 (110 mg, 0.48 mmol) and 3-amino-N-ethylcarbazole (151 mg, 0.72 mmol) in TFA (1 mL) and toluene (1 mL) was stirred at room temperature for 1 hr. To the reaction mixture was added sodium triacetoxyborohydride (304 mg, 1.43 mmol), and the mixture was stirred at room temperature for additional 14 hr. The reaction mixture was concentrated under reduced pressure, and the residue was dissolved in ethyl acetate. The solution was washed with 1N aqueous sodium hydroxide solution, 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 80% ethyl acetate/hexane) to give the title compound (82 mg, 0.193 mmol, 40.5%) as a pale-yellow powder.

Provenance & Evidence