Diisopropylethylamine → 4-(2-Cyanoethylamino)-3-nitro-benzoic acid methyl ester

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To a solution of 4-fluoro-3-nitro-benzoic acid methyl ester (4.95 g, 24.8 mmol) in DMF (25 ml) was added 3-aminopropionitrile fumarate (3.18 g, 12.4 mmol) and DIPEA (15 ml, 84.3 mmol). The mixture was stirred at room temperature for 2 h. The solvent was evaporated under vacuum and the residue diluted with water (50 mL). It was extracted with EtOAc (3×100 mL) and the organic phase washed with brine solution and dried (Na2SO4). Removal of solvent gave 4-(2-cyanoethylamino)-3-nitro-benzoic acid methyl ester (6.19 g, 98.5%). MS-ESI m/z 250 (M+1); 1H NMR (300 MHz, CDCl3) δ 2.8 (t, 2H), 3.8 (m, 2H), 6.9 (d, 1H), 8.2 (m, 1H), 8.5 (t, 1H), 8.9 (s, 1H)

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