Citric Acid → tert-Butyl 3-acetylazetidine-1-carboxylate

Participants

Reaction Steps

To a solution of tert-butyl 3-(methoxy(methyl)carbamoyl)azetidine-1-carboxylate (7.0 g, 28.7 mmol) in THF (150 mL) was added CH3MgBr (43 mL, 43 mmol) at 0° C., then slowly warmed to RT for about 2 hr. 10% aqueous of citric acid (30 mL) was added to the mixture, and extracted with EA (50 mL×3), the combined organic phases were washed with brine (20 mL), dried over Na2SO4, filtered, concentrated and purified by column chromatography on silica gel (200-300 mesh, PE/EA=2/1), to give the crude product (4.0 g, 70%) as a colorless oil. MS (ESI) m/e [M−55]+ 144.0.

Provenance & Evidence