Cesium carbonate → 4-(7-bromo-3-oxo-2H-isoquinolin-2-ylmethyl)benzoic acid tert-butyl ester

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Reaction Steps

A suspension of 7-bromo-3-hydroxy-isoquinoline (7.02 g, 28.2 mmol) in dimethylformamide (75 mL) is treated with 4-bromomethylbenzoic acid tert-butyl ester (12.5 g, 36.7 mmol) and cesium carbonate (11.94 g, 36.7 mmol), then stirred overnight at room temperature. The dimethylformamide is evaporated in vacuo, the residue is diluted with ethyl acetate, washed with 1N HCl, the organic portion washed with brine, dried over MgSO4 and evaporated to dryness. The residue is triturated with hot hexanes/ethyl acetate, cooled to room temperature, and the solid is collected by filtration and dried to give the desired product.

Provenance & Evidence