Potassium Iodide → Methyl 2-(3-tert-butoxycarbonylaminopropoxy)-4-methoxybenzoate

Participants

Reaction Steps

To a solution of methyl 4-methoxysalicylate (11.48 g, 63 mmol) in dimethylformamide (30 mL) was added solid K2 CO3 (13.06 g, 94.5 mmol), 1-tert-butoxycarbonylamino-3-bromopropane (22.5 g, 94.5 mmol), and freshly ground potassium iodide (1.5 g). The resulting slurry was placed under a nitrogen atmosphere and stirred for 2.5 days. The slurry was diluted with water (250 mL), washed with 1 N NaOH (2×250 mL), water (250 mL), and brine (250 mL), then dried over sodium sulfate and concentrated in vacuo. The crude mixture was purified on a preparative HPLC chromatograph using two silica columns and a hexanes through 1:1 hexanes:EtOAc gradient to provide methyl 2-(3-tert-butoxycarbonylaminopropoxy)-4-methoxybenzoate (19.93 g, 93.3%) as a colorless oil.

Provenance & Evidence