Monobasic potassium phosphate → methyl N-(4-bromo-5-methylisoxazol-3-yl)leucinate

Participants

Reaction Steps

To a dry THF solution (20 mL) of methyl N-(4-bromo-5-methylisoxazol-3-yl)-N-[(2,2,2-trichloroethoxy)carbonyl]leucinate (1.19 g, 2.47 mmol) and activated zinc (10.1 g, 154 mmol) was added ca. 10 mL of 1 M KH2PO4 (10 mmol) at 0° C. The mixture was stirred for 1.5 hours, filtered through celite, washed with 150 mL ethyl acetate, and concentrated to a small volume. The mixture was then partitioned between ethyl acetate and saturated aqueous sodium bicarbonate, washed with brine, dried over sodium sulphate and concentrated in vacuo. The crude product was purified by flash chromatography (20% ethyl acetate/hexane) to afford methyl N-(4-bromo-5-methylisoxazol-3-yl)leucinate.

Provenance & Evidence