N-[(4-methoxyphenyl)methyl]-1,3-thiazol-2-amine → 1-bromo-3-chloro-N-(4-methoxybenzyl)-N-(thiazol-2-yl)isoquinoline-6-sulfonamide

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Reaction Steps

A round-bottom flask was charged with N-(4-methoxybenzyl)thiazol-2-amine (238 mg, 1.081 mmol) and THF (4912 μl) to give an opaque solution. The flask was cooled in a dry ice-acetone bath for 5 min to give a milky suspension, then lithium bis(trimethylsilyl)amide (1M in THF) (1081 μl, 1.081 mmol) was added. The flask was removed from the bath for 2 min to give a clear solution, then resubmerged. The mixture appeared to remain a solution. After 5 min, a solution of perfluorophenyl 1-bromo-3-chloroisoquinoline-6-sulfonate (480 mg, 0.982 mmol) in THF (3 mL with a 2 mL wash) was added drop wise. After 25 min, the mixture was diluted with saturated aq. ammonium chloride solution and warmed to room temperature. The mixture was diluted with water and extracted with EtOAc. The organic extract was dried over sodium sulfate, filtered, and concentrated. The residue was purified by chromatography on silica gel (0 to 40% EtOAc/Heptane) to give 1-bromo-3-chloro-N-(4-methoxybenzyl)-N-(thiazol-2-yl)isoquinoline-6-sulfonamide (481 mg, 0.916 mmol, 93% yield) as a white foam: 1H NMR (400 MHz, CHLOROFORM-d) δ ppm=8.32 (d, J=9.0 Hz, 1H), 8.04 (d, J=1.8 Hz, 1H), 7.83 (dd, J=1.9, 9.0 Hz, 1H), 7.67 (s, 1H), 7.44 (d, J=3.6 Hz, 1H), 7.30 (d, J=8.8 Hz, 2H), 7.07 (d, J=3.5 Hz, 1H), 6.75-6.71 (m, 2H), 5.12 (s, 2H), 3.74 (s, 3H). m/z (ESI) 546.0 (M+H)+.

Provenance & Evidence