Phosphorus oxychloride → octanedioic acid [4-(3-Nitro-phenyl)-thiazol-2-yl]-amide methyl ester

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A stirring solution of 4-(3-nitrophenyl)-thiazol-2-ylamine (11) (2.21 g, 10 mmol) and suberic acid monomethyl ester (13) (1.88 g, 10 mmol) in dry pyridine (20 ml) was cooled to −15° C. and POCl3 (1.2 ml, 13 mmol) was added dropwise over 30 minutes. After stirring for another 1 hour at same temperature, the reaction mixture was diluted with EtOAc and washed thoroughly with 1N HCl solution and brine. The organic phase was dried over Na2SO4. The solvent was removed by rotary evaporation. The crude solid was washed with EtOAc to give compound 14 (2.40 g, 61.5%). 1H NMR (400 MHz, DMSO-d6) δ12.3 (1H, s), 8.74 (1H, d, J=1.4 Hz), 8.35 (1H, d, J=7.1 Hz), 8.18 (1H, d, J=7.8 Hz), 7.93 (1H, s), 7.74 (1H, t, J=7.9 Hz), 3.58 (3H, s), 2.46 (2H, t, J=7.5 Hz), 2.30 (2H, t, J=7.3 Hz), 1.61 (2H, t, J=6.5 Hz), 1.53 (2H, t, J=6.8 Hz), 1.30 (4H, brs). 13C NMR (100 MHz, DMSO-d6) δ172.1, 158.8, 148.7, 146.7, 136.2, 132.1, 130.8, 122.7, 120.5, 110.8, 51.6, 35.2, 33.6, 28.6, 28.5, 24.8, 24.6.

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