Water → tert-Butyl 4-{3-[ethyl(methylsulfonyl)amino]-4-nitrophenyl}-1,4-diazepane-1-carboxylate

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Reaction Steps

N-Ethyl-N-(5-fluoro-2-nitrophenyl)methanesulfonamide (3.2 g, 12.2 mmol), tert-butyl 1-homopiperazinecarboxylate (2.5 g) and potassium carbonate (2 g) were heated together in DMSO at 50° C. for 5 hours. The solution was allowed to cool and poured into 500 mL of water. The solid product was collected by filtration, washed with water and dried. The product was purified by flash chromatography (ethyl acetate:petrol 1:1). Yield 2.6 g (48%) 1H NMR (400 MHz, CDCl3) δ 1.16 (t, J=7.33 Hz, 3 H), 1.39 (s, 9 H), 2.0 (br, 2 H), 2.99 (s, 3 H), 3.2 (br, 2 H), 3.54–3.75 (br, 8 H), 6.65 (br d, J=9.3 Hz, 1 H), 6.67 (d,j=2.93 Hz, 1 H), 8.1 (d, J=9.3 Hz, 1 H); MS (ESI+) for C19H30N4O6S m/z 442 (M+).

Provenance & Evidence