4-Nitrophenyl benzo[d]thiazol-2-ylcarbamate → 6-(1-(Benzo[d]thiazol-2-ylcarbamoyl)-1,2,3,4-tetrahydroquinolin-7-yl)-3-phenylpicolinic acid

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A mixture of methyl 3-phenyl-6-(1,2,3,4-tetrahydroquinolin-7-yl)picolinate (29H) (17 mg, 0.049 mmol) and 4-nitrophenyl benzo[d]thiazol-2-ylcarbamate (19) (15.5 mg, 0.049 mmol) in anhydrous CH3CN (0.8 mL) was heated to reflux for 6 hours, cooled to rt, concentrated under reduced pressure, and the crude material was purified by column chromatography on silica gel eluting with a gradient of PE:EtOAc 72:28-55:45, to provide the desired product methyl 6-(1-(benzo[d]thiazol-2-ylcarbamoyl)-1,2,3,4-tetrahydroquinolin-7-yl)-3-phenylpicolinate (29I): 1H NMR (300 MHz, CDCl3) δ 8.23 (1H, d), 8.13 (1H, d), 7.85-7.76 (3H, m), 7.66 (1H, d), 7.48-7.35 (4H, m), 7.34-7.28 (2H, m), 6.89 (1H, d), 3.98 (2H, t), 3.71 (3H, s), 2.85 (2H, t), 2.09 (2H, m).

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