Benzyl Bromide → 2-Benzyl 4-(tert-butyl) morpholine-2,4-dicarboxylate

Participants

Reaction Conditions

Reaction Steps

In a 500-mL round-bottom flask, the 4-(tert-butoxycarbonyl)morpholine-2-carboxylic acid (5.0 g, 22 mmol) was dissolved in DMF (75 mL). Benzyl bromide (3.6 ml, 30 mmol) was added via syringe, followed by potassium carbonate (4.8 g, 35 mmol). The sides of the glass were rinsed down with dmf (25 mL), and an air condenser was affixed, the reaction mixture was heated at 80° C. in an oil bath for 14 h. The reaction was cooled to ambient temperature and concentrated. The residue was transferred to a separatory funnel with 60% ether-hexane (300 mL), and the organic layer was extracted with water (75 mL), half-saturated brine (30 mL), and saturated brine (30 mL), then was dried over sodium sulfate and concentrated. The residue was purified through silica gel (500 mL) using 20% to 30% EtOAc-hexane to afford the title compound (6.81 g, 21 mmol). MS m/z 266 (M+1-isobutylene).

Provenance & Evidence