Lithium Hexamethyldisilazide → 1-chloro-N-(2,4-dimethoxybenzyl)-N-(thiazol-2-yl)isoquinoline-6-sulfonamide

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Reaction Steps

A solution of N-(2,4-dimethoxybenzyl)thiazol-2-amine (0.642 g, 2.56 mmol) in tetrahydrofuran (9.39 ml) was cooled in a dry ice-acetone bath for 5 min. Lithium bis(trimethylsilyl)amide (1M in THF) (2.68 ml, 2.68 mmol) was added drop wise, then the flask was removed from the cooling bath for 5 min. The flask was again cooled into a dry ice-acetone bath for 20 min, resulting in the formation of a thick slurry. A solution of perfluorophenyl 1-chloroisoquinoline-6-sulfonate (see Example 73, Step 1; 1.0 g, 2.441 mmol) in THF (5 mL) was added drop wise, and the reaction was stirred for 30 minutes. The reaction was warmed to room temperature and quenched with saturated ammonium chloride solution, diluted with ethyl acetate and washed with water. The aqueous layer was extracted with ethyl acetate, and the combined organic layers were dried with sodium sulfate, filtered, and concentrated. The filtrate was purified by chromatography on an 80-g with 0 to 50% EtOAc/Heptane to afford 1-chloro-N-(2,4-dimethoxybenzyl)-N-(thiazol-2-yl)isoquinoline-6-sulfonamide (INTERMEDIATE OOO) as a white solid. (ESI) 498.2 (M+Na)+.

Provenance & Evidence