Triethylamine → N-(3-(1-ethyl-3,3,5-trimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-benzo[b][1,4]diazepin-7-yloxy)propyl)-2-nitrobenzenesulfonamide

Participants

Reaction Steps

Triethylamine (0.8 ml, 5.7 mmol) was added to a dichloromethane solution (50 ml) of 7-(3-aminopropoxy)-1-ethyl-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione (1.22 g, 3.8 mmol) and ice-cooled. o-Nitrobenzenesulfonyl chloride (1.03 g, 4.2 mmol) was added to the resulting mixture, and stirred at room temperature for 2 hours. Water was added to the reaction mixture, and extraction with dichloromethane was performed. The organic layer was washed with water and a saturated sodium chloride aqueous solution, in this order, then dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=1:1→0:1). The purified product was concentrated to dryness under reduced pressure to thereby obtain 1.86 g (yield: 97%) of N-(3-(1-ethyl-3,3,5-trimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-benzo[b][1,4]diazepin-7-yloxy)propyl)-2-nitrobenzenesulfonamide as a white amorphous solid.

Provenance & Evidence